Heat capacity of the spinel superconductors CuRh2S4 and CuRh2Se4 |
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| Authors: | Makoto Tachibana |
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| Institution: | 1. College of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu 241000, China;2. Department of Mathematics and Physics, Hefei University, Hefei 230601, China;3. High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei 230031, China;1. Gaerttner LINAC Center, Rensselaer Polytechnic Institute, Troy, NY 12180, United States;2. Naval Nuclear Laboratory, KAPL, P.O. Box 1072, Schenectady, NY 12301, United States;1. Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China;2. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China;3. College of Electronic Science Engineering, Nanjing University of Post and Telecommunication, Nanjing, Jiangsu 211106, China;4. School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China;5. Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences, Hefei, Anhui 230026, China;6. Collaborative Innovation Center of Advanced Microstructures, Nanjing, Jiangsu 210093, China;1. Graduate School of Education, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8524, Japan;2. Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima 980-0065, Japan;1. L. F. Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, 142190, Moscow, Troitsk, Russia;2. A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, 119333, Moscow, Russia;1. Voronezh State University, Universitetskaya pl., 1, 394006 Voronezh, Russia;2. Ioffe Physical and Technical Institute, Polytekhnicheskaya, 26, 194021 St-Petersburg, Russia;3. Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Privada 17 Norte, No 3417, Col San Miguel Hueyotlipan, 72050 Puebla, Pue., Mexico;4. Karlsruhe Nano Micro Facility, H.-von-Helmholtz-Platz, 1, 76344 Eggenstein-Leopoldshafen, Germany |
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| Abstract: | We report low-temperature heat capacity measurements on CuRh2S4 and CuRh2Se4. These compounds undergo a superconducting transition at and 3.38 K, respectively, with a fully opened superconducting gap. With increasing magnetic field , the Sommerfeld coefficient shows a crossover from linear to sublinear dependence that is consistent with the predictions of recent theoretical calculations. Compared to CuRh2Se4, CuRh2S4 exhibits a smaller region of the linear- dependence in and pronounced positive curvature in the temperature dependence of the upper critical field. |
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