The energy gap of the high Tc superconductor La1.85Sr0.15CuO4 |
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| Institution: | 1. Department of Physics, The Chinese University of Hong Kong, Hong Kong, China;2. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena CA 91125, USA;3. School of Physical Sciences, Great Bay University, Dongguan 523000, China;4. Great Bay Institute for Advanced Study, Dongguan 523000, China;5. Department of Physics and Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China;6. Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China;1. Institute for Advanced Study, Shenzhen University, Shenzhen, 518000, China;2. College of Physics and Optoelectronic Engineering, Shenzhen University, 518060, Shenzhen, China;3. CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China;4. CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei, 230026, China;1. Departamento de Física, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Apartado Postal 14, 22800, Ensenada, Baja California, Mexico;2. Institut de Physique Nucléaire, Atomique et de Spectroscopie, CESAM, University of Liège, B-4000 Liège, Belgium;1. School of Physical Science and Technology, Soochow University, Suzhou 215006, China;2. International Center for Quantum Materials, Peking University, Beijing 100871, China;3. Institute for Advanced Study, Soochow University, Suzhou 215006, China;4. Beijing Academy of Quantum Information Sciences, Beijing 100193, China;5. CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China;1. School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China;2. School of Physical Science and Technology, Soochow University, Suzhou 215006, China;3. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China;4. Collaborative Innovation Center of Quantum Matter, Beijing 100871, China;5. CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | We have measured the energy gap of a polycrystalline sample of La1.85Sr0.15CuO4 using far-infrared reflectance. The sample was prepared by sintering and has a superconducting transition at 36 ±1 K (mid point of a 2K wide region) both in resistance and magnetic susceptibility. The Meissner effect was incomplete and there was considerable absorption below the gap frequency in the superconducting state. The change in far infrared absorption on going to the superconducting state was fitted to the theory of Mattis and Bardeen, yielding an energy gap of (3.2 ± 0.3) kTc withTc= 36 K |
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