Pressure effects on the transition temperature and the magnetic field penetration depth in the pyrochlore superconductor RbOs_2O_6
- Resource Type
- Working Paper
- Authors
- Khasanov, R.; Eshchenko, D. G.; Karpinski, J.; Kazakov, S. M.; Zhigadlo, N. D.; Brütsch, R.; Gavillet, D.; Keller, H.
- Source
- Phys. Rev. Lett., v. 93, 157004 (2004).
- Subject
- Condensed Matter - Superconductivity
- Language
We report magnetization measurements under high hydrostatic pressure in the newly discovered pyrochlore superconductor RbOs_2O_6 (T_c\simeq6.3K at p=0). A pronounced and {\it positive} pressure effect (PE) on T_c with dT_c/dp =0.090(1)K/kbar was observed, whereas no PE on the magnetic penetration depth \lambda was detected. The relative pressure shift of T_c [ dlnT_c/dp \simeq 1.5%/kbar] is comparable with the highest values obtained for highly underdoped high-temperature cuprate superconductors. Our results suggest that RbOs_2O_6 is an adiabatic BCS-type superconductor.
Comment: 11 pages, 4 figures