Pressure Effects on the Transition Temperature and the Magnetic Field Penetration Depth in the Pyrochlore Superconductor RbOs2O6

R. Khasanov; D. G. Eshchenko; J. Karpinski; S. M. Kazakov; N. D. Zhigadlo; R. Brütsch; D. Gavillet; D. Di Castro; A. Shengelaya; F. La Mattina; A. Maisuradze; C. Baines; H. Keller

doi:10.1103/PhysRevLett.93.157004

Pressure Effects on the Transition Temperature and the Magnetic Field Penetration Depth in the Pyrochlore Superconductor RbOs2O6

R. Khasanov, D. G. Eshchenko, J. Karpinski, S. M. Kazakov, N. D. Zhigadlo, R. Brütsch, D. Gavillet, D. Di Castro, A. Shengelaya, F. La Mattina, A. Maisuradze, C. Baines, H. Keller

DOI 10.1103/PhysRevLett.93.157004 · Physical Review Letters

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Abstract

Magnetization measurements under hydrostatic pressure up to 8 kbar in the pyrochlore superconductor RbOs2O6 (Tc≃6.3 K at p=0) were carried out. A positive pressure effect on Tc with dTc/dp=0.090(3) K/kbar was observed, whereas no pressure effect on the magnetic penetration depth λ was detected. The pressure independent ratio 2Δ0/kBTc=3.72(2) (Δ0 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 λ(T) indicate that RbOs2O6 is an adiabatic s-wave BCS-type superconductor. The value of λ extrapolated to zero temperature and ambient pressure was estimated to be 230(30) nm.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.3	Pressure unresolved	unknown
RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.35	Pressure unresolved	unknown
RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.59	Pressure unresolved	unknown
RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.1	0.8 GPa	unknown
Cd2Re2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1	Pressure not reported	unknown
KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.6	Pressure not reported	unknown
CsOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.3	Pressure not reported	unknown