The critical magnetic field of anisotropic two-band magnetic superconductors |
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| Authors: | A Changjan P Udomsamuthirun |
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| Institution: | 1. Prasarnmitr Physics Research Unit, Department of Physics, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand;2. Thailand Center of Excellence in Physics, Si Ayutthaya Road, Bangkok 10400, Thailand;3. Department of Mathematics and Basic science, Faculty of Science and Technology, Phathumwan Institute of Technology, Bangkok 10330, Thailand;1. Sakarya Üniversitesi, Fen-Edebiyat Fakültesi, Fizik Bölümü, 54187 Adapazar?, Turkey;2. Sakarya Üniversitesi, BIMAYAM Biyomedikal, Manyetik ve Yar?iletken Malzemeler Ara?t?rma Merkezi, 54187 Sakarya, Turkey;3. School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK;1. Instituto de Física “Gleb Wataghin”, UNICAMP, Campinas-SP 13083-859, Brazil;2. Instituto de Física, Universidade Federal de Uberlândia, 38400-902, Uberlândia-MG, Brazil;3. Laboratório Nacional de Luz Síncrotron, Caixa Postal 6192, CEP 13084-971, Campinas, SP, Brazil;1. Institute for High Pressure Physics of Russian, Academy of Sciences, Troitsk, Russia;2. Institute for Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russia;3. Ames Laboratory, Iowa State University, Ames, IA 50011, USA;4. Los Alamos National Laboratory, Los Alamos, NM 87545, USA |
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| Abstract: | The upper and lower critical fields, and the critical field ratio of an anisotropic two-band magnetic superconductor in the Ginzburg–Landau (GL) scenario is derived analytically. The temperature-dependent upper critical field is investigated and applied to Fe-based superconductors. We find that a very high value of zero-temperature upper critical field in Fe-based superconductors can be found in the negative differential susceptibility region. The temperature-dependent upper critical field is presented in two formulas, in the empirical view and in the GL two-band view, which agrees with the experimental results. |
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