Precise Pressure Dependence of the Superconducting Transition Temperature of FeSe: Resistivity and ^77Se-NMR Study - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: We report the precise pressure dependence of FeSe from a resistivitymeasurement up to 4.15 GPa. Superconducting transition temperature T cincreases sensitively under pressure, but shows a plateau between 0.5-1.5 GPa.The maximum T c, which is determined by zero resistance, is 21 K atapproximately 3.5 GPa. The onset value reaches ~37 K at 4.15 GPa. We alsomeasure the nuclear spin-lattice relaxation rate 1-T 1 under pressure using77Se-NMR measurement. 1-T 1 shows that bulk superconductivity is realized inthe zero-resistance state. The pressure dependence of 1-T 1T just above T cshows a plateau as well as the pressure dependence of T c, which gives clearevidence of the close relationship between 1-T 1T and T c. Spin fluctuationsare suggested to contribute to the mechanism of superconductivity.



Autor: S. Masaki, H. Kotegawa, Y. Hara, H. Tou, K. Murata, Y. Mizuguchi, Y. Takano

Fuente: https://arxiv.org/







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