Journal of Low Temperature Physics最新文献

{"title":"Benefits of the Use of Monte Carlo Simulations in Cryogenic Detector Design","authors":"Simone Lotti,&nbsp;Matteo D’Andrea,&nbsp;Claudio Macculi,&nbsp;Luigi Piro,&nbsp;Caroline Kilbourne,&nbsp;Dan McCammon,&nbsp;Ralph Kraft","doi":"10.1007/s10909-025-03273-8","DOIUrl":"10.1007/s10909-025-03273-8","url":null,"abstract":"<div><p>Monte Carlo simulations represent a useful tool to predict and understand the behavior of X-ray detectors in space and on ground. We made use of the Geant4 software to simulate the performances of several TES detectors. We investigated the performances of the X-IFU CryoAC, a large area TES-based silicon detector in a laboratory environment, and its response to the ground level flux of cosmic muons. We were able to predict the background of the Athena X-IFU instrument (ESA) in the L1 environment for an equivalent time of <span>(sim)</span>100 ks and used the code to investigate the dependence of such a background on possible changes in the geometry such as pixel layout and size. We also compared the results with the ones obtained for the Line Emission Mapper (LEM), a probe concept proposed to NASA that uses a different TES array optimized for higher spectral resolution of lower energy photons, identifying issues with the detector design and indicating possible solutions.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"219 1-2","pages":"1 - 18"},"PeriodicalIF":1.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-025-03273-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143784082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unconventional Superconducting States in the (t-J) Model on Creutz Lattice","authors":"Feng Xu","doi":"10.1007/s10909-025-03264-9","DOIUrl":"10.1007/s10909-025-03264-9","url":null,"abstract":"<div><p>We study the onset of unconventional pair superfluidity in the <i>t</i>-<i>J</i> model on the Creutz lattice, which shows strictly flat bands in the noninteracting regime, using renormalized mean-field theory. Our study reveals the competition and coexistence between intrachain electron pairs and interchain electron pairs with varying antiferromagnetic interaction strengths at zero temperature. We observe that interchain pairs persist under strong interchain antiferromagnetic interaction but are suppressed by intrachain antiferromagnetic interaction. Interestingly, as hole-doping increases, we find that intrachain and interchain pairs exhibit distinct properties: The interchain pairs display a dome-like shape reminiscent of the superconducting dome observed in high-<span>(T_{c})</span> superconductors. In contrast, the intrachain pairs’ gap increases smoothly with the hole-doping level. Furthermore, we find that the interchain pairs are more robust than intrachain pairs under thermal fluctuations; their critical temperature is higher than that of intrachain pairs. It is implementable to simulate and control strong electron correlation behavior on the Creutz lattice in ultracold atoms experiment or other artificial structures. Our predictions are verifiable and promote the understanding of flat band superconductivity.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"218 5-6","pages":"423 - 432"},"PeriodicalIF":1.1,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring BiSn Sphere Attachment of Absorbers for Gamma-Ray TES","authors":"Adrika Dasgupta,&nbsp;Daniel Becker,&nbsp;Douglas Bennett,&nbsp;Mark Keller,&nbsp;Fabian Kislat,&nbsp;Daniel Schmidt,&nbsp;Daniel Swetz,&nbsp;Joel Weber,&nbsp;Kasun Wimalasena","doi":"10.1007/s10909-024-03261-4","DOIUrl":"10.1007/s10909-024-03261-4","url":null,"abstract":"<div><p>A Super-Conducting ENergetic x-ray Telescope (ASCENT) is a concept for a future balloon-borne high-energy X-ray telescope in the energy range 60–85 keV to study gamma-ray emissions of 67.87 keV and 78.32 keV from the radioactive isotope ⁴⁴Ti. For the focal plane instrumentation, ASCENT will use Mo-Cu/Mo-Au bilayer transition edge sensor (TES) microcalorimeter gamma-ray detectors with tin (Sn) absorbers. ‘Spectrometer to Leverage Extensive Development of Gamma-ray TESs for Huge Arrays using Microwave Multiplexed Enabled Readout’ (SLEDGEHAMMER), a detector development project at the National Institute of Standards and Technology, acts as the basis for the detector arrays for ASCENT. SLEDGEHAMMER has tin (Sn) absorbers attached to the SU-8 epoxy posts, lithographically placed on the detectors, but we are also considering other geometries for the chips where the absorbers are attached to the chips separated from the TESs, which could help to avoid parallel path for a current flow around the detectors with these BiSn sphere attachments. In this work, we are reporting on developing a method to attach Tin (Sn) absorbers to the transition edge sensors (TESs) with 0.2 mm diameter BiSn solder spheres replacing epoxy. The goal is to improve the thermal conductivity between the absorbers and the TESs compared to what was achieved using epoxy, potentially reducing the presence of an athermal component in the tails of signal pulses. We describe our efforts toward finding optimal temperature and pressure conditions for making this contact and the progress toward contact resistance measurements of these joints.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"218 3-4","pages":"324 - 333"},"PeriodicalIF":1.1,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-024-03261-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Giant Effective g Factor and Low Effective Mass in (Pb_{1-x}Sn_{x}Te): Effect of Strong Spin-Orbit Interaction and Band Inversion","authors":"Himanshu S. Gouda,&nbsp;Sashi S. Behera,&nbsp;Rajiba L. Hota","doi":"10.1007/s10909-024-03258-z","DOIUrl":"10.1007/s10909-024-03258-z","url":null,"abstract":"<div><p>The IV-VI compound semiconductors comprising binary and ternary tellurides exhibit an elevated effective g factor <span>((g_textrm{eff}))</span> and reduced effective mass <span>((m^{*}))</span> as a consequence of potent spin-orbit (s.o) interaction. In the ternary compound with magnetic impurity, the observations of high <span>(g_textrm{eff})</span> and corresponding low <span>(m^{*})</span> are not only attributed to s.o interaction, but also s/p-d/f hybridization. However, as compared to the exchange interaction, the s.o interaction is the strongest and most dominating in these diluted magnetic semiconductors. The strength of the s.o coupling is manifested by the presence of an elevated <span>(g_textrm{eff})</span> and low <span>(m^{*})</span> in the system. In this correspondence, we measure these parameters in <span>(Pb_{1-x}Sn_{x}Te)</span>, with <i>Sn</i> as the non-magnetic impurity for different carriers at fixed temperature; T = 1.5K. Here, we formulate an effective equation within the framework of multi-band <span>(vec {k}cdot vec {pi })</span> theory, incorporating the effect of s.o interaction and a magnetic field. We derive expressions for the <span>(g_textrm{eff})</span> and <span>(m^{*})</span> through Green’s function expansion method by considering the above interactions with <i>Sn</i> impurity and assuming the band inversion model relevant to the <span>(Pb_{1-x}Sn_{x}Te)</span> system. Finally, we extensively examine these parameters and their respective anisotropies in <span>(Pb_{1-x}Sn_{x}Te)</span> as functions of carrier concentration and impurity levels at <span>(T=1.5 K)</span>.We introduce a remarkably high effective g factor, specifically <span>(g_textrm{eff}=4280)</span>, for n<span>(-Pb_{1-x}Sn_{x}Te)</span> and <span>(g_textrm{eff}=3680)</span>, for p<span>(-Pb_{1-x}Sn_{x}Te)</span>. These values exhibit significant anisotropies, accompanied by correspondingly low effective masses, with <span>(m_{c}^{*}=0.0023m_{0})</span> and <span>(m_{v}^{*}=0.0024m_{0})</span> at <span>(x=0.36)</span> within the concentration range of <span>(10^{17})</span> to <span>(10^{18} {text{cm}}^{{ - 3}})</span>. The existence of high <span>(g_textrm{eff})</span> and low <span>(m^{*})</span> in strongly s.o interacting systems like <i>PbTe</i>, and its alloy <span>(Pb_{1-x}Sn_{x}Te)</span> qualify them to be used in spin-orbit physics apart from the field of thermoelectronics.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"218 3-4","pages":"284 - 304"},"PeriodicalIF":1.1,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anomalies of Critical Magnetic Behavior in ({text{La}}_{0.9}{text{Bi}}_{0.1}{text{MnO}}_{3}) Manganite","authors":"V. Punith Kumar","doi":"10.1007/s10909-025-03269-4","DOIUrl":"10.1007/s10909-025-03269-4","url":null,"abstract":"<div><p>The study of critical magnetic properties of La_0.9Bi_0.1MnO₃ is reported and discussed. The sample exhibits rhombohedral perovskite crystal structure with trivial lattice structural distortions, surprisingly maintaining the proper stoichiometry and composition as evidenced by energy-dispersive X-ray spectroscopy. The critical behavior observed in the magnetization measurements is studied using different models with proper data analysis attributed to the magnetic frustrations arising due to the inhomogeneities. The zero-field-cooled magnetization measurements below <i>T</i> &lt; <i>T</i>_<i>K</i> exhibit frozen ferromagnetic inhomogeneous spin agglomerates. The observed low-temperature-dependent field-cooled magnetization measurement has been approximated by considering the quadratic and non-quadratic dispersion law incorporating corrections to the Bloch’s relation. The exponents like <i>γ</i> and <i>β</i> obtained from critical scaling analysis further confirms the inhomogeneities in magnetic behavior and doesn’t correspond to any of the well-known universality class such as 3D Ising, 3D Heisenberg and mean-field models.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"218 5-6","pages":"451 - 464"},"PeriodicalIF":1.1,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temperature and Doping Dependences of the Hall Coefficient within the Spin-Fermion Model of Cuprates","authors":"M. M. Korovushkin","doi":"10.1007/s10909-025-03265-8","DOIUrl":"10.1007/s10909-025-03265-8","url":null,"abstract":"<div><p>In the framework of an ensemble of spin-polaron quasiparticles formed owing to the strong coupling between the spins of copper ions and holes on oxygen ions in cuprate superconductors, the temperature dependences of the Hall coefficient <span>(R_H)</span> for undoped, lightly doped, underdoped, optimally doped and overdoped regimes are calculated. The anomalous behavior of kinetic coefficients is considered beyond the relaxation-time approximation within the multi-moment method for solving kinetic equation. Dependences <span>(R_H(T))</span> calculated in the four-moment approach for noted doping regimes demonstrate the main qualitative peculiarities of the dependences found in the experiments on the Hall effect in cuprates. It is shown that change of the hopping integral of oxygen holes influences on the modification of anomalous sharp drop and change of <span>(R_H)</span> sign observed experimentally at low temperatures in underdoped regime.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"218 5-6","pages":"433 - 450"},"PeriodicalIF":1.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Observation of Resistive Transitions in Copper Due to Proximity to a Frustrated Antiferromagnetic Insulator","authors":"Dyvison Pedreira Pimentel","doi":"10.1007/s10909-024-03260-5","DOIUrl":"10.1007/s10909-024-03260-5","url":null,"abstract":"<div><p>This work experimentally explores the induction of resistive transitions in a metal through the magnetic proximity effect, focusing specifically on the transitions in the electrical resistance of copper induced by the magnetic transitions of copper oxychloride. The findings unveiled a sharp drop in the electrical resistance of the conductive channel within the metallized regime, precisely coinciding with the magnetic transitions of copper oxychloride. The study’s findings align with prior research on spin resistivity in frustrated antiferromagnet, and this phenomenon can be attributed to the induction of triplet states within the metallic layer via the magnetic proximity effect. These insights hold the potential to unlock new avenues for the investigation of spintronic devices and magnetic interface phenomena.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"218 5-6","pages":"414 - 422"},"PeriodicalIF":1.1,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of Helium Liquefaction Performance Based on the Temperature-Distributed Regenerative Refrigeration Method Using 3He Fluid","authors":"Qiang Cao,&nbsp;Lichun Ge,&nbsp;Miaomiao Wang,&nbsp;Yuji Chen,&nbsp;Pengcheng Wang,&nbsp;Zhiping Wang,&nbsp;Peng Li,&nbsp;Qinyu Zhao,&nbsp;Bo Wang,&nbsp;Zhihua Gan","doi":"10.1007/s10909-024-03262-3","DOIUrl":"10.1007/s10909-024-03262-3","url":null,"abstract":"<div><p>Liquid helium has important applications in infrared wavelength detection, superconducting quantum interference, and so on. Regenerative refrigerators are generally applied for small-scale applications. However, the liquefaction efficiency of helium is not high. The main reason is the contradiction between the large sensible heat load and the limited refrigeration efficiency at 4.2 K. A novel method of temperature-distributed regenerative refrigeration, which generates the refrigeration power over a wide temperature range based on real gas effects, is theoretically studied using the ³He working fluid for the first time. The liquefaction rate and efficiency of helium is improved because of a smaller entropy generation with this temperature-distributed method. The temperature-distributed refrigeration power of the ³He working fluid is larger than that of ⁴He when the absolute pressure is smaller, because the critical pressure of ³He is lower; while such a refrigeration power of ³He distributes at a lower temperature range that of ⁴He at the same reduced pressure because the critical temperature of ³He is lower. The liquefaction rate reaches 50.5 L/d when the cold-end refrigeration power is 1.5 W. This rate is 2–3 times that of liquefying with only the cold end with ⁴He or ³He. Furthermore, the liquefaction efficiency (FOM) increases with the rise in pressure. The theoretical FOM is 47.7% at a reduced pressure of 61.7 (14.1 MPa), which is a 7% improvement over the case with ⁴He (44.7%). These results demonstrate advantages of using the temperature-distributed method with ³He, thus opening up a new avenue for further researches in helium liquefaction systems.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"218 3-4","pages":"305 - 323"},"PeriodicalIF":1.1,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure and Properties of Superconducting Tungsten Thin Films: Influence of Substrate Temperature and Annealing temperature","authors":"Yu Wang,&nbsp;Yuanyuan Liu,&nbsp;Jianjie Zhang,&nbsp;Yifei Zhang,&nbsp;Zhouhui Liu,&nbsp;Chi Xu,&nbsp;Shaojun Zhang,&nbsp;Jianping Cheng","doi":"10.1007/s10909-024-03249-0","DOIUrl":"10.1007/s10909-024-03249-0","url":null,"abstract":"<div><p><span>(alpha)</span>-W thin films are widely used in superconducting transition edge sensors due to their extremely low transition temperature and weak electron–phonon coupling. However, the influence of annealing and substrate temperatures on thin film performance has not been fully understood, nor has the relationship between microstructure and thin film performance. In this study, we investigate the changes in grain size, resistivity, film stress, and transition temperature of the film by varying the annealing and substrate temperatures. Microstructure showed that annealing contributed to grain growth. With the increase in annealing temperature, the resistivity of the film decreased and the compressive stress was relieved. The minimum transition temperature reached 28.7 mK at an annealing temperature of <span>(470 ^{circ })</span>C. In addition, the GIXRD results showed that the preferred orientation of the films changed from (110) to (211) with the increase in the substrate temperature. <span>(100 ^{circ }hbox {C}-230 ^{circ })</span>C favorite to reduce film resistivity and transition temperature, and to relieve film compressive stress.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"218 3-4","pages":"258 - 267"},"PeriodicalIF":1.1,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and Characterization of an Ag:Er Alloy for Metallic Magnetic Calorimeters","authors":"J. W. Song,&nbsp;Y. C. Cho,&nbsp;H. J. Kim,&nbsp;M. K. Lee","doi":"10.1007/s10909-024-03253-4","DOIUrl":"10.1007/s10909-024-03253-4","url":null,"abstract":"<div><p>We synthesized an Ag:Er alloy having paramagnetic properties to be used as a temperature sensor in metallic magnetic calorimeters. The Ag:Er master alloy and a 2-inch target for film deposition were, respectively, manufactured using vacuum arc melting and RF heating under process conditions designed to minimize impurity contamination. Calculations and measurements of magnetization versus magnetic field were employed to check for magnetic impurities in the host material, Ag, and to estimate the Er concentration in the Ag:Er alloy at each step of the synthesis. The temperature-dependent magnetization of deposited thin films from the synthesized Ag:Er with <span>(^{168})</span>Er isotope was measured in the mK range, demonstrating their suitability as temperature sensors for low-temperature detectors such as metallic magnetic calorimeters.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"218 Part 5","pages":"110 - 123"},"PeriodicalIF":1.1,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}