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, H. Keller
Abstract
We report magnetization measurements under high hydrostatic pressure in the newly discovered pyrochlore superconductor RbOs2O6 (Tc6.3K at p=0). A pronounced and positive pressure effect (PE) on Tc with dTc/dp =0.090(1)K/kbar was observed, whereas no PE on the magnetic penetration depth λwas detected. The relative pressure shift of Tc [ dlnTc/dp 1.5%/kbar] is comparable with the highest values obtained for highly underdoped high-temperature cuprate superconductors. Our results suggest that RbOs2O6 is an adiabatic BCS-type superconductor.
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