Journal of Low Temperature Physics最新文献

Disruption of Superfluid Helium Film Flow in a Filling Capillary 充注毛细管中超流氦膜流动的破坏

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-05-05 DOI: 10.1007/s10909-026-03412-9

Alexander Jones, Oleg Kirichek, Sasha Horney, Christopher Lawson

{"title":"Disruption of Superfluid Helium Film Flow in a Filling Capillary","authors":"Alexander Jones, Oleg Kirichek, Sasha Horney, Christopher Lawson","doi":"10.1007/s10909-026-03412-9","DOIUrl":"10.1007/s10909-026-03412-9","url":null,"abstract":"<div><p>Superfluid liquid <sup>4</sup>He consists of superfluid and normal components. The superfluid component has zero viscosity and zero entropy, therefore flows without dissipation. The normal component carries heat and can produce a high velocity flow which leads to very high thermal conductivity. In neutron scattering and muon spectroscopy experiments with powder samples, <sup>4</sup>He gas is often used as an exchange medium to thermalise the sample. Samples are usually cooled using a dilution refrigerator with installed capillaries which admit <sup>4</sup>He into the experimental volume. Below 2 K the inner surface of the capillary is covered with a superfluid <sup>4</sup>He film, which can thermally link stages of the dilution refrigerator with a catastrophic effect on its performance. In our experiment, we utilised a 0.1% mixture of <sup>3</sup>He in <sup>4</sup>He to disrupt the superfluid helium film flow and, as a result, significantly reduced the parasitic thermal flow to the experimental can. The addition of a small amount of <sup>3</sup>He into <sup>4</sup>He allows a significant improvement of thermal performance when using this technique in neutron scattering experiments at very low temperatures.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829481","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}

引用次数: 0

New Tunable Nonclassical Correlations in a Generalized Two-Mode Vacuum State via a Bosonic Exponential Quadratic Operator 基于玻色子指数二次算子的广义双模真空态新可调谐非经典关联

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-05-04 DOI: 10.1007/s10909-026-03417-4

Gang Ren

引用次数: 0

Quantum Oscillations and Superconductivity in YPtBi Under Pressure 压力下YPtBi的量子振荡和超导性

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-28 DOI: 10.1007/s10909-026-03404-9

Jared Z. Dans, Prathum Saraf, Lillian Jirousek, Carsyn L. Mueller, Chandra Shekhar, Claudia Felser, Johnpierre Paglione

{"title":"Quantum Oscillations and Superconductivity in YPtBi Under Pressure","authors":"Jared Z. Dans, Prathum Saraf, Lillian Jirousek, Carsyn L. Mueller, Chandra Shekhar, Claudia Felser, Johnpierre Paglione","doi":"10.1007/s10909-026-03404-9","DOIUrl":"10.1007/s10909-026-03404-9","url":null,"abstract":"<div><p>The topological semimetal YPtBi has attracted considerable attention, owing to its novel superconducting and normal state properties. A strong band inversion from spin-orbit coupling allows the existence of <span>(j=3/2)</span> quasi-particles near the Fermi level, which form Cooper pairs with angular momentum potentially higher than single or triplet states. In this report, we present high-pressure magnetotransport and Shubnikov-de Haas effect measurements on high-quality YPtBi up to <span>(P = 2.08)</span> GPa. As a function of pressure, we observe a trend toward more insulating resistivity at low temperatures concomitant with a suppression of quantum oscillation amplitude. Together with a decrease of the upper critical field and significant increase in the Dingle temperature, the pressure-induced changes point to a weakening of the band inversion and potential tuning of the topological nature of YPtBi, suggesting pressure as a useful tool for understanding the nature of topology in other related half-Heusler compounds.\u0000</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147796654","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}

引用次数: 0

Isothermal I–V Curves Reconstruction in Superconducting Single Crystals by Means of Nonlinear AC Transport Experiments 用非线性交流输运实验重建超导单晶等温I-V曲线

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-19 DOI: 10.1007/s10909-026-03399-3

Francisco Castillo Menegotto, Juan Schmidt, Mariano Marziali Bermúdez, Gabriela Pasquini

{"title":"Isothermal I–V Curves Reconstruction in Superconducting Single Crystals by Means of Nonlinear AC Transport Experiments","authors":"Francisco Castillo Menegotto, Juan Schmidt, Mariano Marziali Bermúdez, Gabriela Pasquini","doi":"10.1007/s10909-026-03399-3","DOIUrl":"10.1007/s10909-026-03399-3","url":null,"abstract":"<div><p>In this work, we propose a procedure to obtain the voltage vs current (<i>I</i>–<i>V</i>) curves by means of AC transport measurements, of particular interest for single crystals mounted on settings in which its thermal coupling to the environment is week, and Joule dissipation can cause unwanted thermal decoupling from the thermometer. We present a simple model that accounts for the overheating of a sample in this type of experimental setup and propose two experimental protocols in which thermal oscillations and gradients on the measured region of the sample can be neglected and the overall temperature shifts can be accounted for and corrected. As an example, we present preliminary results obtained using one of these protocols in a Ba(Fe<span>(_{0.81})</span>Co<span>(_{0.09})</span>)<span>(_2)</span>As<span>(_2)</span> single crystal, mounted on a strain-cell, demonstrating that we are able to obtain reliable <i>I</i>–<i>V</i> curves in the vicinity of a vortex-glass transition that exhibit the expected critical behavior. Both the model and the proposed procedure can be used in a broad spectrum of experimental situations far away the presented example.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737896","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}

引用次数: 0

Fragmentation Temperature of 1D and 3D Quantum Droplets in a BEC Mixture BEC混合物中一维和三维量子液滴的破碎温度

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-19 DOI: 10.1007/s10909-026-03402-x

Jeroen Van Loock, Denise Ahmed-Braun, Jacques Tempere

{"title":"Fragmentation Temperature of 1D and 3D Quantum Droplets in a BEC Mixture","authors":"Jeroen Van Loock, Denise Ahmed-Braun, Jacques Tempere","doi":"10.1007/s10909-026-03402-x","DOIUrl":"10.1007/s10909-026-03402-x","url":null,"abstract":"<div><p>In a mixture of two Bose–Einstein condensates, the interactions can be tuned such that self-bound objects called quantum droplets appear. Whereas the ground states of such quantum droplets at finite temperature have been studied for three- and one-dimensional configurations, the possible fragmentation of these droplets has so far not been considered in these studies. In this paper, we show that droplets can lower their free energy by splitting or fragmenting in a combination of multiple smaller droplets and/or a gas. Three-dimensional droplets will split when the interspecies interaction strength is considerably stronger than the intraspecies interaction strength, and the number of atoms is of the same order as the minimum number of atoms necessary to form a droplet. One-dimensional droplets will fragment as long as the intraspecies and interspecies interactions strength do not vary too much in strength and the density is not to big compared with the scattering length. If the temperature rises, 1D droplets will split by expelling atoms, forming a gas of predominantly free atoms and pairs of atoms. These pairs remain present in the system up to considerably high temperatures compared to the transition temperature. Our results provide important insights on the stability of these droplets.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737897","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}

引用次数: 0

Dynamic Nuclear Spin Polarization of (nu =2/3) Fractional Quantum Hall States in Multiply-Connected Corbino Geometry 多重连接Corbino几何中(nu =2/3)分数量子霍尔态的动态核自旋极化

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-19 DOI: 10.1007/s10909-026-03409-4

Akira Fukuda, Akira Endo, Yoshiaki Hashimoto

{"title":"Dynamic Nuclear Spin Polarization of (nu =2/3) Fractional Quantum Hall States in Multiply-Connected Corbino Geometry","authors":"Akira Fukuda, Akira Endo, Yoshiaki Hashimoto","doi":"10.1007/s10909-026-03409-4","DOIUrl":"10.1007/s10909-026-03409-4","url":null,"abstract":"<div><p>We studied spatially-resolved measurements of dynamic nuclear spin polarization (DNP) in the <span>(nu =2/3)</span> fractional quantum Hall state. To avoid the influence of quantum Hall edge effects and to perform spatially-resolved measurements of bulk DNP alone, we fabricated a device with a multiply-connected Corbino geometry from a high-mobility GaAs/AlGaAs two-dimensional electron system wafer. We simultaneously measured six sets of resistances to track their time evolution during the depolarization, DNP, and relaxation processes. DNP was induced using large alternating or direct currents, and the polarization was carried out in the polarized phase. Under AC DNP, only monotonic changes in resistance were observed during the DNP process, whereas under DC DNP, non-monotonic behavior was detected, first decreasing (increasing) and then turning into increasing (decreasing) stage a few thousand seconds after starting the DNP, and showing random fluctuations in the latter stage. The results are consistent with our previous measurements performed in a Hall bar. Comparison of the resistances measured with different pairs of electrodes reveals that the resistance induced by domain wall mainly increase around the area close to the inner (source) electrode, with the area being smaller for DC DNP.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737898","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}

引用次数: 0

Andreev bound states in a superconducting qubit at odd parity 奇宇称超导量子比特的Andreev束缚态

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-16 DOI: 10.1007/s10909-026-03398-4

Manuel Houzet, Julia S Meyer, Yuli V Nazarov

{"title":"Andreev bound states in a superconducting qubit at odd parity","authors":"Manuel Houzet, Julia S Meyer, Yuli V Nazarov","doi":"10.1007/s10909-026-03398-4","DOIUrl":"10.1007/s10909-026-03398-4","url":null,"abstract":"<div><p>The quantum mechanics of the Josephson effect is the core ingredient for quantum technologies with superconducting circuits. A new avenue was recently opened in this field by predicting that the Josephson quantum mechanics in the odd parity sector, when a quasiparticle is trapped in an Andreev bound state, is fundamentally different from the conventional one in the even sector. The focus was then on a Josephson junction surrounded by an electromagnetic environment formed of a collection of bosonic modes, including the case of an ohmic environment. Here we consider the distinct case of a superconducting qubit made of a single Josephson junction whose environment reduces to a capacitance. We find a novel structure for the low-lying discrete states in the odd sector, which is altogether different from the one that appears in the even sector. Our study of the bound-state spectrum ranges from the Coulomb-dominated (Cooper pair box) to the Josephson-dominated (transmon) regime. Our prediction could be tested in forthcoming experiments with superconductor/semiconductor/superconductor junctions, which have been studied intensively in recent years, both using nanowires as well as two-dimensional electron gases.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-026-03398-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686535","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}

引用次数: 0

Instability Toward Superconducting Stripe Phase in Altermagnets with Strong Rashba Spin-Orbit Coupling 强Rashba自旋-轨道耦合交替磁体中超导条纹相的不稳定性

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-13 DOI: 10.1007/s10909-026-03393-9

Kohei Mukasa, Yusuke Masaki

引用次数: 0

Non-degenerate Pumping of Superconducting Resonator Parametric Amplifier with Evidence of Phase-Sensitive Amplification 具有相敏放大证据的超导谐振腔参量放大器的非简并抽运

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-09 DOI: 10.1007/s10909-026-03407-6

Songyuan Zhao, S. Withington, C. N. Thomas

{"title":"Non-degenerate Pumping of Superconducting Resonator Parametric Amplifier with Evidence of Phase-Sensitive Amplification","authors":"Songyuan Zhao, S. Withington, C. N. Thomas","doi":"10.1007/s10909-026-03407-6","DOIUrl":"10.1007/s10909-026-03407-6","url":null,"abstract":"<div><p>Superconducting resonator parametric amplifiers are potentially important components for a wide variety of fundamental physics experiments and utilitarian applications. We propose and realise an operating scheme that achieves amplification through the use of non-degenerate pumps, which addresses two key challenges in the design of parametric amplifiers: non-continuous gain across the amplification band and pump tone removal. We have experimentally demonstrated the non-degenerate pumping scheme using a half-wave resonator amplifier based on NbN thin-film, and measured a peak gain of 26 dB and 3-dB bandwidth of 0.5 MHz. The two non-degenerate pump tones were positioned <span>(sim 10)</span> bandwidths above and below the frequency at which peak gain occurs. We have found the non-degenerate pumping scheme to be more stable compared to the usual degenerate pumping scheme in terms of gain drift over time, by a factor of 4. This scheme also retains the usual flexibility of NbN resonator parametric amplifiers in terms of reliable amplification in a <span>(sim 4)</span> K environment, and is suitable for cross-harmonic amplification. The use of pump tones at different frequencies allows phase-sensitive amplification when the signal tone is degenerate with the idler tone. A gain of 23 dB and squeezing ratio of 6 dB were measured.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-026-03407-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642721","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}

引用次数: 0

The Haldane Gap of the (S=7) Antiferromagnetic Chain (S=7)反铁磁链的霍尔丹隙

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-04-09 DOI: 10.1007/s10909-026-03406-7

Hiroki Nakano, Toru Sakai

引用次数: 0