Ce1-xYbxCoIn5不同Yb掺杂浓度下的超导性质数据集

我们对高质量单晶Ce1-xYbxCoIn5，x=0，0.05，0.125，0.2，0.3，0.4，0.5进行了比热测量以及横场缪子自旋旋转弛豫实验。其中比热测量是2016年在复旦大学应用表面物理国家重点实验室由美国Quantum Design公司生产的综合物性测量系统PPMS-9T完成，并配合PPMS 的dilution refrigerator（DR）插杆，可将测量最低温降至50 mK。该系统的比热测量选件是目前凝聚态物理研究中最常用的比热测量装置，拥有很高的可靠性和可重复性，在业界认可度高。材料利用Apiezon N grease低温脂粘到样品台上，以保证测量材料与测量装置良好的热接触，数据处理利用专业数据处理软件Origin完成。其中，横场缪子自旋旋转弛豫实验是2016年在加拿大温哥华的线站实验基地TRIUMF进行，样品环境:装备有最低温可降至20 mK的DR装置，外加磁场垂直于缪子自旋极化方向，大小为30 mT。横场缪子自旋旋转弛豫实验对于探测第二类超导体涡旋态的磁场分布是十分高效的，我们能通过缪子自旋极化弛豫率来获取超导体的超流密度。我们的实验探究了中间价元素Yb在重费米子Ce1-xYbxCoIn5中的掺杂效应。我们发现随着Yb掺杂浓度的提升超流密度会相对变小，其中在Yb掺杂浓度小于0.2之前，超流密度减小迅速；在掺杂浓度高于0.2之后，超流密度减小缓慢，趋于饱和。并且无论是在重费米子区域还是中间价态区域，“正常”流密度（定义为零温超流密度减去T温度的超流密度）与比热的电子贡献Ce/T始终具有同样的温度依赖关系。因此，该课题对于推动重费米子态以及中间价态内的多体效应等理论发展具有重大作用。 数据量：60.3MB。

We performed specific heat measurements and transverse-field muon spin rotation and relaxation (TF-μSR) experiments on high-quality single-crystalline Ce₁₋ₓYbₓCoIn₅ with x = 0, 0.05, 0.125, 0.2, 0.3, 0.4, and 0.5.

The specific heat measurements were conducted in 2016 at the State Key Laboratory of Surface Physics, Fudan University, using a PPMS-9T physical property measurement system manufactured by Quantum Design, USA, paired with the PPMS dilution refrigerator (DR) insert, which allows the minimum measurement temperature to reach 50 mK. The specific heat measurement option of this system is the most commonly used device for specific heat measurements in condensed matter physics research, featuring high reliability and repeatability, and is widely recognized in the industry. The samples were adhered to the sample stage using Apiezon N grease to ensure excellent thermal contact between the samples and the measurement setup, and data processing was completed using the professional data analysis software Origin.

The transverse-field muon spin rotation and relaxation experiments were carried out in 2016 at the TRIUMF facility in Vancouver, Canada. The sample environment was equipped with a DR apparatus capable of achieving a minimum temperature of 20 mK, with an external magnetic field perpendicular to the muon spin polarization direction and a magnitude of 30 mT. TF-μSR experiments are highly efficient for detecting the magnetic field distribution of the vortex state in type-II superconductors, and the superfluid density of the superconductor can be extracted from the muon spin polarization relaxation rate.

Our study investigated the doping effect of the intermediate-valence element Yb on the heavy-fermion compound Ce₁₋ₓYbₓCoIn₅. We found that the superfluid density decreases relatively with increasing Yb doping concentration: the superfluid density decreases rapidly when the doping concentration is below 0.2, and decreases slowly and tends to saturate when the doping concentration exceeds 0.2. Moreover, regardless of whether in the heavy-fermion region or the intermediate-valence region, the "normal" superfluid density (defined as the zero-temperature superfluid density minus the superfluid density at temperature T) always exhibits the same temperature dependence as the electronic contribution to the specific heat, Cₑ/T.

Therefore, this work plays a crucial role in advancing the theoretical development of many-body effects in heavy-fermion states and intermediate-valence states. The total data size is 60.3 MB.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于Ce1-xYbxCoIn5材料在不同Yb掺杂浓度（x=0至0.5）下的超导性质研究，通过比热测量和横场缪子自旋旋转弛豫实验获取数据。实验发现，随着Yb掺杂浓度增加，超流密度逐渐减小，并在掺杂浓度高于0.2后趋于饱和，同时超流密度与电子比热表现出相似的温度依赖关系。数据集包含49.94MB的46个文件，旨在为重费米子态和中间价态理论发展提供支持。