Khasanov R, Eshchenko D G, Karpinski J, Kazakov S M, Zhigadlo N D, Brütsch R, Gavillet D, Di Castro D, Shengelaya A, La Mattina F, Maisuradze A, Baines C, Keller H
Laboratory for Neutron Scattering, Eidgenössische Technische Hochschule, Zürich, Switzerland.
Phys Rev Lett. 2004 Oct 8;93(15):157004. doi: 10.1103/PhysRevLett.93.157004. Epub 2004 Oct 5.
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.
在高达8千巴的静水压力下，对烧绿石超导体RbOs2O6（p = 0时，Tc约为6.3 K）进行了磁化测量。观察到压力对Tc有正效应，dTc/dp = 0.090(3) K/千巴，而未检测到压力对磁穿透深度λ有影响。发现与压力无关的比值2Δ(0)/kBTc = 3.72(2)（Δ(0)是零温度下的超导能隙）接近BCS值3.52。λ(T)的磁化和μ子自旋旋转测量表明，RbOs2O6是一种绝热s波BCS型超导体。外推到零温度和环境压力下的λ值估计为230(30)纳米。
