The upper critical field of a cuprate high-temperature superconductor, La1.84Sr0.16CuO4, was investigated by high-frequency self-resonant contactless electrical conductivity measurements in magnetic fields up to 102 T. An irreversible transition was observed at 85 T (T = 4.2 K), defined as the upper critical field. The temperature-dependent upper critical field was argued on the basis of the Werthamer-Helfand-Hohenberg theory. The Pauli-limiting pair-breaking process with a small contribution of the spin-orbit coupling explained the first-order phase transition exhibiting a hysteresis observed at low temperatures.
CITATION STYLE
Nakamura, D., Adachi, T., Omori, K., Koike, Y., & Takeyama, S. (2019). Pauli-limit upper critical field of high-temperature superconductor La1.84Sr0.16CuO4. Scientific Reports, 9(1). https://doi.org/10.1038/s41598-019-52973-1
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