压力对超导2H-NbSe₂费米面的诱导效应。
Pressure induced effects on the Fermi surface of superconducting 2H-NbSe2.
作者信息
Suderow H, Tissen V G, Brison J P, Martínez J L, Vieira S
机构信息
Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada, Instituto de Ciencia de Materiales Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
出版信息
Phys Rev Lett. 2005 Sep 9;95(11):117006. doi: 10.1103/PhysRevLett.95.117006.
The pressure dependence of the critical temperature T(c) and upper critical field H(c2)(T) has been measured up to 19 GPa in the layered superconducting material 2H-NbSe2. T(c)(P) has a maximum at 10.5 GPa, well above the pressure for the suppression of the charge density wave (CDW) order. Using an effective two-band model to fit H(c2)(T), we obtain the pressure dependence of the anisotropy in the electron-phonon coupling and Fermi velocities, which reveals the peculiar interplay between CDW order, Fermi surface complexity, and superconductivity in this system.
在层状超导材料2H-NbSe₂中，已测量了临界温度T(c)和上临界场H(c2)(T)在高达19 GPa压力下的压力依赖性。T(c)(P)在10.5 GPa处出现最大值，远高于抑制电荷密度波(CDW)有序态的压力。使用有效双带模型拟合H(c2)(T)，我们得到了电子-声子耦合和费米速度中各向异性的压力依赖性，这揭示了该系统中CDW有序态、费米面复杂性和超导性之间的特殊相互作用。
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