Pressure effects on the transition temperature and the magnetic field penetration depth in the pyrochlore superconductor RbOs2O6.
Pressure effects on the transition temperature and the magnetic field penetration depth in the pyrochlore superconductor RbOs2O6.
复制标题
压力对烧绿石超导体 RbOs2O6 的转变温度和磁场穿透深度的影响。
DOI：
10.1103/physrevlett.93.157004
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发表时间：
2004
影响因子：
8.6
通讯作者：
H. Keller
中科院分区：
文献类型：
--
作者：
R. Khasanov;D. Eshchenko;J. Karpiński;S. Kazakov;Nikolai Zhigadlo;R. Brütsch;D. Gavillet;D. Di Castro;A. Shengelaya;F. La Mattina;A. Maisuradze;C. Baines;H. Keller
在高达 8 kbar 的静水压力下，对烧绿石超导体 RbOs2O6（T(c) 在 p=0 时约等于 6.3 K）进行了磁化测量。观察到对 T(c) 的正压力影响，dT(c)/dp=0.090(3) K/kbar，而没有检测到压力对磁穿透深度 lambda 的影响。发现与压力无关的比率2 Delta(0)/k(B)T(c)=3.72(2)（Delta(0)是零温度下的超导间隙）接近BCS值3.52。 lambda(T)的磁化和μ子自旋旋转测量表明RbOs2O6是绝热s波BCS型超导体。外推至零温度和环境压力的 lambda 值估计为 230(30) nm。
Magnetization measurements under hydrostatic pressure up to 8 kbar in the pyrochlore superconductor RbOs2O6 (T(c) approximately or equal 6.3 K at p=0) were carried out. A positive pressure effect on T(c) with dT(c)/dp=0.090(3) K/kbar was observed, whereas no pressure effect on the magnetic penetration depth lambda was detected. The pressure independent ratio 2 Delta(0)/k(B)T(c)=3.72(2) (Delta(0) is the superconducting gap at zero temperature) was found to be close to the BCS value 3.52. Magnetization and muon-spin rotation measurements of lambda(T) indicate that RbOs2O6 is an adiabatic s-wave BCS-type superconductor. The value of lambda extrapolated to zero temperature and ambient pressure was estimated to be 230(30) nm.