Journal of Low Temperature Physics最新文献_第3页

Giant Negative Temperature Coefficient of Resistance and Magnetotransport in Antiferromagnetic CaMnO3 反铁磁CaMnO3中电阻和磁输运的巨负温度系数

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-06-26 DOI: 10.1007/s10909-025-03312-4

Haochen Wang, Gefei Lu, Weishi Tan, Junran Li, Kunpeng Su, Shuai Huang, Lin Yang, Haiou Wang

{"title":"Giant Negative Temperature Coefficient of Resistance and Magnetotransport in Antiferromagnetic CaMnO3","authors":"Haochen Wang, Gefei Lu, Weishi Tan, Junran Li, Kunpeng Su, Shuai Huang, Lin Yang, Haiou Wang","doi":"10.1007/s10909-025-03312-4","DOIUrl":"10.1007/s10909-025-03312-4","url":null,"abstract":"<div>CaMnO3, a perovskite manganite known for its antiferromagnetic (AFM) and other physical properties, has underexplored transport properties and temperature coefficient of resistance (TCR). We report exceptional charge transport phenomena in orthorhombic CaMnO3, revealing a record negative temperature coefficient of resistance (TCR = − 31.8% K⁻1 at 21 K) for antiferromagnetic insulators. Magnetic characterization shows a Néel temperature (TN) of 81.5 K. This magnetic transition govern distinct charge transport regimes, variable-range hopping (VRH) below TN and small polaron (SP) conduction above TN, demonstrating the existence of magnetic-electric coupling. Remarkably, the material exhibits field-independent TCR stability up to 6 T and significant magnetoresistance (MR = − 17.5% at 22 K). These findings demonstrate CaMnO3 potential for antiferromagnetic spintronic applications, particularly in magnetic sensors and spin-engineered thermal detection technologies in extreme environments.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"19 - 40"},"PeriodicalIF":1.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230238","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

Simulation and Experimental Study on the Pre-cooling Performance of the Condenser in Helium Sorption Cooler 氦气吸附冷却器冷凝器预冷性能的仿真与实验研究

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-06-25 DOI: 10.1007/s10909-025-03311-5

TianShuo Liu, XiaoYu Cui, LiHao Lu, KongKuai Ying, KangJun Liu, ZhenHua Jiang, ShaoShuai Liu

{"title":"Simulation and Experimental Study on the Pre-cooling Performance of the Condenser in Helium Sorption Cooler","authors":"TianShuo Liu, XiaoYu Cui, LiHao Lu, KongKuai Ying, KangJun Liu, ZhenHua Jiang, ShaoShuai Liu","doi":"10.1007/s10909-025-03311-5","DOIUrl":"10.1007/s10909-025-03311-5","url":null,"abstract":"<div>Helium sorption coolers are widely used for achieving sub-kelvin temperatures due to their advantages of no moving parts, simple structure, and high reliability. While research has primarily focused on system design and sorption characteristics, studies on the condensation process of helium gas in these coolers remain limited. In this study, a three-dimensional simulation model is developed based on a laboratory helium sorption cooler prototype using helium-4 (4He) as the working fluid. The cooler reaches a minimum temperature of 827 mK with a holding time of 20 h. Experimental validation confirms the high accuracy of the model. The study analyzes the flow dynamics of liquid helium during condensation. Liquid helium flows along the narrow walls of the condenser heat exchanger, enters the evaporator through the pump tube, and evaporates, lowering the evaporator temperature. The evaporated helium gas then rises through the center of the pump tube. The study also examines the effect of pre-cooling temperature and operating pressure on the cooling rate. A decrease in pre-cooling temperature from 3.3 to 3.2 K leads to a sharp increase in the cooling rate, with cooling time dropping from 167 to 123 s. As the pre-cooling temperature further drops, the cooling time continues to decrease, but the impact on the cooling rate diminishes. Similarly, increasing the operating pressure from 37 to 41 kPa accelerates the cooling process initially, but the impact lessens as pressure continues to rise.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"221 1-6","pages":"1 - 18"},"PeriodicalIF":1.4,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230542","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

Superconductivity in Re-Based Hexagonal C14 Laves Alloys TRe(_{2}) (T = Zr and Hf) re基六方C14合金TRe (_{2}) （T = Zr和Hf）的超导性

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-06-22 DOI: 10.1007/s10909-025-03310-6

Junbao He, Jianyu Li, Shishi Ma, Xuechao He, Jingyi Zhang, Chenbing Zhao, Yu Fu, Congbin Liu, Yongsong Luo, Hui Liang, Hao Shi

{"title":"Superconductivity in Re-Based Hexagonal C14 Laves Alloys TRe(_{2}) (T = Zr and Hf)","authors":"Junbao He, Jianyu Li, Shishi Ma, Xuechao He, Jingyi Zhang, Chenbing Zhao, Yu Fu, Congbin Liu, Yongsong Luo, Hui Liang, Hao Shi","doi":"10.1007/s10909-025-03310-6","DOIUrl":"10.1007/s10909-025-03310-6","url":null,"abstract":"<div>The superconductors with Kagome lattice have recently attracted significant interest due to their unconventional superconducting properties. Here, we present a comprehensive investigation of the superconducting properties of the Re-based hexagonal C14 Laves alloys TRe(_{2}) (T = Zr and Hf), which contain a hexagonal diamond lattice of T atoms and a breathing Kagome lattice of Re atoms. The electrical resistivity, magnetization, and specific heat measurements confirm type-II bulk superconductivity with T(_{C}) = 6.1 K for ZrRe(_{2}) and 5.8 K for HfRe(_{2}). The superconducting parameters, such as the lower and upper critical field, the coherence length, the penetration depth, the electron–phonon coupling constant, and the density of electronic states at Fermi energy level, are comparable with those of other hexagonal C14 Laves compounds with the same crystal structure. In particular, the values of these parameters are quite close to those of the BCS theoretical framework, suggesting that both ZrRe(_{2}) and HfRe(_{2}) are weakly coupled type-II superconductors as other hexagonal C14 Laves alloys.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"220 3-6","pages":"294 - 305"},"PeriodicalIF":1.4,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145167337","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

Controlling the Growth and Collapse of Multielectron Bubbles in Liquid Helium by Engineering the Convective Flow 通过工程对流控制液氦中多电子气泡的生长和坍缩

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-06-17 DOI: 10.1007/s10909-025-03307-1

Dillip Kumar Pradhan, Soutik Sur, Neda Shamim, Vaisakh Vadakkumbatt, Ambarish Ghosh

引用次数: 0

Low-Noise Large-Bandwidth High-Gain Transimpedance Amplifier for Cryogenic STM at 77 K 77 K低温STM低噪声大带宽高增益跨阻放大器

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-06-13 DOI: 10.1007/s10909-025-03301-7

Ying-Xin Liang, Ru-Nan Shang, Fang-Hao Liang, Hao Zhang, Ke He

{"title":"Low-Noise Large-Bandwidth High-Gain Transimpedance Amplifier for Cryogenic STM at 77 K","authors":"Ying-Xin Liang, Ru-Nan Shang, Fang-Hao Liang, Hao Zhang, Ke He","doi":"10.1007/s10909-025-03301-7","DOIUrl":"10.1007/s10909-025-03301-7","url":null,"abstract":"<div>In this work, we design and fabricate the transimpedance amplifier (TIA) following the design mentioned in Liang (Ultramicroscopy, 267:114051, 2024). In the TIA, the pre-amplifier (Pre-Amp) is made of a junction field-effect transistor (JFET) that can work at 77 K. The post-amplifier (Post-Amp) is made of an operational amplifier. Cascade Pre-Amp and Post-Amp to form the inverting amplifier. With a 1.13 G(Omega ) feedback network, the gain of TIA is 1.13 G(Omega ) and its bandwidth is about 97 kHz. The equivalent input noise voltage power spectral density (PSD) of TIA is not more than 9 (nV)(^2)/Hz at 10 kHz and 4 (nV)(^2)/Hz at 50 kHz, and its equivalent input noise current PSD is about 26 (fA)(^2)/Hz at 10 kHz and 240 (fA)(^2)/Hz at 50 kHz. The measured electrical performances and noise performances of TIA are consistent with the simulations and calculations. As an example, the realization of TIA in this work verifies the design method and analytical calculations for the low-noise large-bandwidth high-gain TIA proposed in Liang (Ultramicroscopy, 267:114051, 2024), Liang (Ultramicroscopy, 234:13466, 2022). And, the TIA in this work is perfect for the cryogenic STM working at liquid nitrogen temperature. With this TIA, at 77 K, the scanning tunneling spectroscopy and scanning tunnel shot noise spectroscopy measurements can be performed at the frequency of tens of kHz, even in the case of high tip–sample resistance.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"220 3-6","pages":"210 - 224"},"PeriodicalIF":1.4,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164992","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

Development and Characterization of a Cryogenic Tuned Amplifier for Penning Trap Applications 用于彭宁阱的低温调谐放大器的研制与特性研究

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-06-05 DOI: 10.1007/s10909-025-03309-z

Niraj Chaddha, A. K. Sikdar, J. Nandi, C. H. Vyshnav, M. Chatterjee, P. Das, A. Ray

{"title":"Development and Characterization of a Cryogenic Tuned Amplifier for Penning Trap Applications","authors":"Niraj Chaddha, A. K. Sikdar, J. Nandi, C. H. Vyshnav, M. Chatterjee, P. Das, A. Ray","doi":"10.1007/s10909-025-03309-z","DOIUrl":"10.1007/s10909-025-03309-z","url":null,"abstract":"<div>A two-stage tuned amplifier has been developed and characterised for operation at cryogenic temperatures for Penning Trap application. Two pHEMT devices were tested at 300 K, 77 K and 4.2 K for their DC and AC characteristics. The developed amplifier has shown an amplification of 40 dB at a quiescent power consumption of ~ 1 mW at liquid helium temperature. Considering the feeble intensity of the image charge signal from Penning trap, the input impedance of the first stage amplifier is kept high whereas the output impedance of the second stage is kept 50 Ω for impedance matching with the transmission line. The bandwidth was ~ 200 kHz with the centre frequency around 40 MHz to match with the axial frequency of the electrons confined in the Penning trap. The amplifier was tested at 5 T magnetic field and it showed similar performance as in no field condition. The signal of trapped electrons, in a Penning trap at 4.2 K, was detected using this amplifier through the resonance absorption technique, confirming its suitability for the system.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"220 3-6","pages":"281 - 293"},"PeriodicalIF":1.4,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-025-03309-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162358","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

Correction: Crossover From Quantum Mechanical Tunneling to the Superlinear Power Law in Silicon Microcrystal, Doped by Boron and Nickel 修正：从量子力学隧穿到掺杂硼和镍的硅微晶体的超线性幂律的交叉

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-06-04 DOI: 10.1007/s10909-025-03306-2

Yu Khoverko

引用次数: 0

Cobalt Concentration-Dependent Structural and Magnetic Transitions in Nanocrystalline Ni0.9−xZn0.1CoxFe2O4 Ferrites 纳米晶Ni0.9−xZn0.1CoxFe2O4铁氧体中钴浓度相关的结构和磁跃迁

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-06-01 DOI: 10.1007/s10909-025-03299-y

K. K. Palsaniya, Anchal, Sarita, M. S. Rulaniya, Pooja Yadav, R. K. Beniwal, Namita Kumari, P. A. Alvi, B. L. Choudhary

{"title":"Cobalt Concentration-Dependent Structural and Magnetic Transitions in Nanocrystalline Ni0.9−xZn0.1CoxFe2O4 Ferrites","authors":"K. K. Palsaniya,  Anchal,  Sarita, M. S. Rulaniya, Pooja Yadav, R. K. Beniwal, Namita Kumari, P. A. Alvi, B. L. Choudhary","doi":"10.1007/s10909-025-03299-y","DOIUrl":"10.1007/s10909-025-03299-y","url":null,"abstract":"<div>Nanocrystalline Ni0.9−xZn0.1CoxFe2O4 (x = 0.2, 0.4, 0.6, 0.8) ferrites were synthesized via the sol–gel method, yielding a cubic single-phase spinel structure (Fd−3m), as confirmed through Rietveld refinement. The crystallite size was observed to increase from 7 to 10 nm with higher Co substitution. Magnetic characterization revealed a pronounced dependence on Co concentration, with zero-field-cooled and field-cooled magnetization curves exhibiting bifurcation indicative of magnetic relaxation phenomena. The Ni0.5Zn0.1Co0.4Fe2O4 composition exhibited a blocking temperature of 191 K, a Curie temperature of 207 K, and a transition from ferromagnetic ordering at 5 K to superparamagnetic behavior at 300 K. Similarly, Ni0.3Zn0.1Co0.6Fe2O4 demonstrated a transition at 251 K with retained ferromagnetic ordering at 5 K. In contrast, Ni0.1Zn0.1Co0.8Fe2O4 displayed magnetic irreversibility and a paramagnetic state at 300 K. Raman spectroscopy further corroborated the inverse spinel structure, revealing characteristic vibrational modes at ~ 460 cm⁻1 and 680 cm⁻1. These findings underscore the pivotal role of Co substitution in modulating the structural and magnetic properties of Ni0.9−xZn0.1CoxFe2O4 nanocrystals, particularly their temperature-dependent magnetic phase transitions. Collectively, the results highlight the influence of Co concentration on the structural and magnetic properties of Ni0.9−xZn0.1CoxFe2O4 nanocrystals, particularly their temperature-dependent magnetic transitions.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"220 3-6","pages":"192 - 209"},"PeriodicalIF":1.4,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160660","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

Magnetocaloric Effect and Thermodynamic Properties of Trapped Polarons in 2D Monolayers Transition Metal Dichalcogenides 二维单层过渡金属硫化物中捕获极化子的磁热效应和热力学性质

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-05-30 DOI: 10.1007/s10909-025-03298-z

J. V. Nguepnang, B. Donfack, C. M. Ekengoue, E. L. Mbieda-Posseu, F. X. Ngagoum Tchamdjeu, W. Nganfo, C. Kenfack-Sadem

{"title":"Magnetocaloric Effect and Thermodynamic Properties of Trapped Polarons in 2D Monolayers Transition Metal Dichalcogenides","authors":"J. V. Nguepnang, B. Donfack, C. M. Ekengoue, E. L. Mbieda-Posseu, F. X. Ngagoum Tchamdjeu, W. Nganfo, C. Kenfack-Sadem","doi":"10.1007/s10909-025-03298-z","DOIUrl":"10.1007/s10909-025-03298-z","url":null,"abstract":"<div>We investigated the magnetocaloric effect (MCE) and thermodynamic properties of Magnetopolaron embedded in two-dimensional (2D) transition metal dichalcogenides (TMDs) under the canonical ensemble approach. From the results, we found that an increase in magnetic field considerably affects the magnetic moment alignment or brings an additional energy in 2D TMDs monolayers which is responsible for the energy exchange observed. The entropy change or MCE, which is more pronounced in the case of molybdenum and less for tungsten, affects the magnetic state of material. The combined effect of magnetic field and temperature has a great change on the magnetic state of 2D TMDs monolayer materials. The behavior of free energy obtained in the present paper can be used as a characteristic of paramagnetic materials. It comes that all 2D TMDs monolayers studied in the present manuscript present a paramagnetic aspect making them promising candidates for practical applications of magnetic refrigeration.</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"220 3-6","pages":"173 - 191"},"PeriodicalIF":1.4,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145170944","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

Surface Dilution Effects on Magnetic Properties and Compensation Phenomena of ({Fe}^{text{II}}), ({Fe}^{text{III}})) Core–Shell Ferrimagnetic Nanotubes: Monte Carlo Study 表面稀释对({Fe}^{text{II}}), ({Fe}^{text{III}}))核-壳铁磁纳米管磁性能和补偿现象的影响：蒙特卡罗研究

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-05-30 DOI: 10.1007/s10909-025-03305-3

Z. Elmghabar, A. Elidrysy, L. B. Drissi, S. Harir

{"title":"Surface Dilution Effects on Magnetic Properties and Compensation Phenomena of ({Fe}^{text{II}}), ({Fe}^{text{III}})) Core–Shell Ferrimagnetic Nanotubes: Monte Carlo Study","authors":"Z. Elmghabar, A. Elidrysy, L. B. Drissi, S. Harir","doi":"10.1007/s10909-025-03305-3","DOIUrl":"10.1007/s10909-025-03305-3","url":null,"abstract":"<div>Using Monte Carlo simulations (MCS), we investigated the magnetic properties and phase diagrams of a hexagonal ferrimagnetic Ising nanotube with a core–shell structure composed of spin-5/2 and spin-2 particles, taking surface dilution into account. Our results revealed several characteristic behaviors. Notably, the concentration of magnetic atoms has a significant influence on both the critical and compensation temperatures. For low values of the exchange interaction ({J}_{s}), dilution has no effect on the critical temperature. However, a compensation point appears beyond a dilution threshold, observed for (xge 0.6).We also identified critical thresholds for the crystal field anisotropies ({D}_{s}) and ({D}_{c}). Below these thresholds, the critical temperature remains nearly constant, then gradually increases and converges toward a saturation value once the thresholds are exceeded. Furthermore, the analysis of hysteresis loops shows that the system’s magnetic response is highly influenced by dilution: the remanent magnetization increases significantly in absolute value as the concentration of magnetic atoms rises from (0.6) to(1.0).</div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"220 3-6","pages":"254 - 269"},"PeriodicalIF":1.4,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145170943","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