Journal of Low Temperature Physics最新文献_第6页

Calculation and Proposal for Improving the Timing Jitter of Transition-Edge Sensors 改善过渡边缘传感器时序抖动的计算与建议

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-07 DOI: 10.1007/s10909-025-03359-3

Akihiro Kato, Kaori Hattori, Sachiko Takasu, Joern Beyer, Daiji Fukuda

{"title":"Calculation and Proposal for Improving the Timing Jitter of Transition-Edge Sensors","authors":"Akihiro Kato, Kaori Hattori, Sachiko Takasu, Joern Beyer, Daiji Fukuda","doi":"10.1007/s10909-025-03359-3","DOIUrl":"10.1007/s10909-025-03359-3","url":null,"abstract":"<div><p>In photonic quantum computing and quantum information processing, photon number resolution is crucial for generating highly non-classical quantum states. Superconducting transition-edge sensors (TESs) are considered one of the most effective photon number-resolving detectors for this purpose. However, the current timing properties of TESs, such as timing jitter (a few ns) and recovery time (several hundred ns), are insufficient, limiting the operational speed of quantum applications. To address the potential for improving TES timing performance, we have proposed an improved calculation to derive TES timing jitter. Our calculations including the effect of the SQUID noise indicate that expanding the electrical bandwidth of the external voltage amplifier and optimizing the inductance to match that bandwidth, can significantly improve timing jitter. According to our model, timing jitter 1 ns FWHM is achievable with an input inductance of 0.35 nH and an electrical bandwidth of 1 GHz. Additionally, we have shown that with our TES and SQUID parameters, the lowest achievable timing jitter is approximately 0.71 ns FWHM. Achieving an even lower jitter would require a redesign aimed at further reducing the SQUID noise.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-025-03359-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145930591","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

Wetting Transitions and Tricriticality in a Three-Component Bose–Einstein Condensate 三组分玻色-爱因斯坦凝聚体中的润湿跃迁和三临界性

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-07 DOI: 10.1007/s10909-025-03355-7

Hoang Van Quyet

引用次数: 0

Development of Cryogenic X-Ray Detectors Based on Mo/Au TES 基于Mo/Au TES的低温x射线探测器研制

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-07 DOI: 10.1007/s10909-025-03361-9

A. Camón, L. Fàbrega, C. Pobes, P. Strichovanec, J. Bolea, J. I. Rico-Camacho, J. L. García-Palacios

引用次数: 0

Thermodynamics of a General Power-Law Trapped Ideal Dunkl-Deformed Bose Gas 一般幂律捕获理想敦克尔变形玻色气体的热力学

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2026-01-05 DOI: 10.1007/s10909-025-03358-4

M. Medani, M. Benarous, A. Hocine, F. Merabtine

引用次数: 0

Operational Electrical Stability and Thermal Performance of Conduction-Cooled NbTi Coil with Acid-Treated Multi-Walled CNT/Epoxy Composite at 4.2 K 酸处理多壁CNT/环氧复合材料传导冷却NbTi线圈在4.2 K下的工作电稳定性和热性能

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-12-21 DOI: 10.1007/s10909-025-03356-6

Hyun Sung Noh, Dawool Kwon, Minkyu Sun, Mtangi Mohamed Mussa, Haigun Lee

{"title":"Operational Electrical Stability and Thermal Performance of Conduction-Cooled NbTi Coil with Acid-Treated Multi-Walled CNT/Epoxy Composite at 4.2 K","authors":"Hyun Sung Noh, Dawool Kwon, Minkyu Sun, Mtangi Mohamed Mussa, Haigun Lee","doi":"10.1007/s10909-025-03356-6","DOIUrl":"10.1007/s10909-025-03356-6","url":null,"abstract":"<div><p>This study extends the applicability of epoxy composites with acid-treated carbon nanotubes (CNTs), previously utilized at 77 K, to 4.2 K, and confirms that the thermal management and operational electrical stability of the filler material are maintained and developed in cryogenic environments. We investigate conduction-cooled NbTi coils impregnated with an acid-treated multi-walled carbon nanotube (MWCNT)/epoxy composite at 4.2 K. The matrix is LOCTITE Stycast 2850 FT with Catalyst 23 LV, and the MWCNTs (outer diameter 6–9 nm) were functionalized using a sulfuric/nitric acid (H<sub>2</sub>SO<sub>4</sub>/HNO<sub>3</sub>) mixture to improve the dispersion and interfacial coupling. SEM confirms uniform dispersion of the treated MWCNTs in the cured matrix. Under conduction cooling at 4.2 K, the composite-impregnated coil cools down faster and has higher minimum quench energy (MQE) across 0.6–0.9 <span>({I}_{c})</span>(energy defined as <span>(E={I}^{2}{R}_{text{heater}}t)</span>), a shorter post-quench re-cooling period, and stable persistent current operation, evidence of the enhanced operational electrical stability of the coil. Transient laser-flash measurements on the composite at 20.7–30.0 °C show a modest increase in through-thickness thermal conductivity, consistent with improved heat spreading. These results demonstrate improved cool-down efficiency, higher MQE, faster post-quench re-cooling, and stable persistent current operation—evidence of enhanced operational electrical stability. In future, we plan to measure the intrinsic low-temperature material properties [<span>(k(T))</span>,<span>({c}_{p}(T))</span>, dielectric metrics], together with multi-loading (0–1.0 wt% MWCNTs) testing.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2025-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145831414","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

Experimental Investigation of Spin Fluctuation and Weak Itinerant Ferromagnetism in Ni₉₂TM₈ (TM = Cr, Nb) Alloys Ni₉₂TM₈（TM = Cr, Nb）合金自旋涨落和弱流动铁磁性的实验研究

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-12-15 DOI: 10.1007/s10909-025-03354-8

Sonu Vishvakarma, Alok Singh

{"title":"Experimental Investigation of Spin Fluctuation and Weak Itinerant Ferromagnetism in Ni₉₂TM₈ (TM = Cr, Nb) Alloys","authors":"Sonu Vishvakarma, Alok Singh","doi":"10.1007/s10909-025-03354-8","DOIUrl":"10.1007/s10909-025-03354-8","url":null,"abstract":"<div><p>The present experimental study investigates the magnetic ground state and spin fluctuation behavior of Ni₉₂TM₈ (TM = Cr, Nb) alloys through detailed magnetization measurements and theoretical analysis using Self-Consistent Renormalization (SCR) and Takahashi’s spin fluctuation theories. The alloys were synthesized via vacuum arc melting and subsequently characterized using energy-dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM), confirming single-phase formation with compositional homogeneity. Temperature and field dependent magnetization (M–T and M–H) measurements reveal second-order ferromagnetic transitions with Curie temperatures of 168 K (Ni₉₂Cr₈) and 173 K (Ni₉₂Nb₈). Both alloys exhibit spontaneous magnetic moments (0.18 μ<sub>B</sub>/f.u and 0.21 μ<sub>B</sub>/f.u) and large Rhodes–Wohlfarth ratios, characteristic of weak itinerant ferromagnetism (WIFM). The temperature dependence of spontaneous magnetization follows M<sup>2</sup> ∝ T<sup>2</sup> at low temperatures and M<sup>2</sup> ∝ T<sup>4/3</sup> near T<sub>C</sub>, in agreement with SCR predictions. Analysis based on Takahashi’s theory yields spin fluctuation parameters (T₀, T<sub>A</sub>, F₁₀) consistent with values reported for classical WIFMs such as ZrZn₂ and Ni₃Al, confirming dominant spin fluctuation effects. Deviations from linearity in Arrott plots near T<sub>C</sub> and the linearity of M<sup>4</sup> vs H/M plots substantiate the itinerant nature of magnetism. The findings elucidate Ni₉₂Cr₈ and Ni₉₂Nb₈ within the weak itinerant regime, governed by delocalized electron magnetism and strong spin fluctuations, offering potential for spintronic and quantum phase transition studies.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145778923","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

Confinement Effects on the Weak-Field Magnetic Susceptibility of a Two-Dimensional Electron Gas 约束对二维电子气体弱场磁化率的影响

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-12-13 DOI: 10.1007/s10909-025-03350-y

Jishad Kumar, Tapio Ala-Nissila

{"title":"Confinement Effects on the Weak-Field Magnetic Susceptibility of a Two-Dimensional Electron Gas","authors":"Jishad Kumar, Tapio Ala-Nissila","doi":"10.1007/s10909-025-03350-y","DOIUrl":"10.1007/s10909-025-03350-y","url":null,"abstract":"<div><p>We study the weak-field magnetic susceptibility of a two-dimensional electron gas for different types of confinement potentials. The susceptibility is strongly dependent on the boundary confinement, and removal of the boundary results in a singularity. The cases of spatially isotropic parabolic, anisotropic, and Gaussian confinement potential are discussed in detail. The effect of spin–orbit interaction via Rashba type of coupling is analyzed in detail for all the potentials mentioned above. We show that a field-dependent susceptibility emerges when the confinement is Gaussian, in contrast to the canonical case of a field-independent susceptibility. The field-dependent weak-field susceptibility arises, even without Rashba spin–orbit coupling or many-body interactions. This distinguishes our result from conventional systems where such behavior typically relies on disorder, spin–orbit effects, or strong correlations. The combination of smooth confinement and magnetic field effects in our model leads to field-dependent behavior in a simple single-particle Hamiltonian, making it potentially amenable to experimental realization in semiconductor quantum wells and nanostructures. Our findings challenge the conventional understanding of susceptibility in weak-field regimes and open new avenues for exploration in quantum and nanoscale systems. We also show that the weak-field susceptibility is independent of the anisotropy parameter as well as the spin–orbit coupling for the anisotropic confinement model. For all the other models, the susceptibility vanishes for large spin–orbit coupling.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-025-03350-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145729860","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

Low-Temperature Performance of (mathrm {Gd_3(Ga, Al)_5O_{12}}):Ce Scintillators (mathrm {Gd_3(Ga, Al)_5O_{12}}):Ce闪烁体的低温性能

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-12-09 DOI: 10.1007/s10909-025-03345-9

Merlin Kole, Kasun Wimalasena, Richard Gorby, Torsten Diesel, Zachary Greenberg, Fabian Kislat

{"title":"Low-Temperature Performance of (mathrm {Gd_3(Ga, Al)_5O_{12}}):Ce Scintillators","authors":"Merlin Kole, Kasun Wimalasena, Richard Gorby, Torsten Diesel, Zachary Greenberg, Fabian Kislat","doi":"10.1007/s10909-025-03345-9","DOIUrl":"10.1007/s10909-025-03345-9","url":null,"abstract":"<div><p>The last years have seen the first cryogenic detectors to be proposed for usage on balloon-borne missions. In such missions, the instrument will be exposed to the high radiation environment of the upper atmosphere. This radiation can induce a significant background to the measurements, something which can be mitigated through the use of an anti-coincidence shield. For hard X-ray and gamma-ray detectors such a shield typically consists of photomultiplier tubes or, more recently, silicon photomultipliers coupled to scintillators placed around the detector. When using cryogenic detectors, the shield can be placed around the entire cryostat which will make it large, heavy and expensive. For the ASCENT (A SuperConducting ENergetic X-ray Telescope) mission, which uses Transition Edge Sensor microcalorimeter detectors, it was therefore considered to instead place the shield inside. This comes with the challenge of operating it at cryogenic temperatures. For this purpose, we tested the performance of 2 different types of GAGG:Ce scintillators down to 15 mK for the first time. Although significant variations of both the decay time and the light yield were found when varying the temperature, at 4 K its performance was found to be similar to that at room temperature. Furthermore, unexpected behavior around 2 K was found for both types of GAGG:Ce, leading to more in-depth studies around these temperatures. Overall, the studies show that the combination of materials will allow to produce a functional anti-coincidence shield at several Kelvin.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":"222 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10909-025-03345-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145729620","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

Spherically Symmetric Counterflow Turbulence in Open Geometry 开放几何中的球对称逆流湍流

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-12-06 DOI: 10.1007/s10909-025-03352-w

Tomáš Dunca, Filip Novotný, Marek Talíř, Balázs Szalai, Nikita Ustinov, Ladislav Skrbek, Emil Varga

引用次数: 0

Vanishing 0–(pi) Discontinuity in Superconductor–Quantum Dot Josephson Junctions 消失0 - (pi)超导体-量子点约瑟夫逊结的不连续

IF 1.4 3区物理与天体物理

Journal of Low Temperature Physics Pub Date : 2025-12-06 DOI: 10.1007/s10909-025-03351-x

Bhupendra Kumar

引用次数: 0