Suderow H, Tissen V G, Brison J P, Martínez J L, Vieira S
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.
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。
