A second phase transition and superconductivity in the beta-pyrochlore oxide KOs2O6
arXiv:cond-mat/0607064 · doi:10.1088/0953-8984/19/14/145283
Abstract
Another phase transition that is probably of first order is found in the beta-pyrochlore oxide superconductor KOs2O6 with a superconducting transition temperature Tc of 9.6 K. It takes place at Tp=7.5 K in the superconducting state in a zero magnetic field. By applying magnetic fields of up to 140 kOe, the Tc gradually decreased to 5.2 K, while Tp changed little, eventually breaking through the Hc2 line at approximately 65 kOe in the H-T diagram. Both the normal-state resistivity and Hc2 change slightly but significantly across the second phase transition. It is suggested that the transition is associated with the rattling of potassium ions located in an oversized cage of osmium and oxide ions.
10 pages including 6 figures; to be published in the Proceedings of HFM2006(J. Phys.: Condens. Matter)
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Cited by in corpus (7)
- Extremely strong-coupling superconductivity and anomalous lattice properties in the beta-pyrochlore oxide KOs2O6
- Chemical trends of superconducting properties in pyrochlore oxides
- Strong-Coupling Theory of Rattling-Induced Superconductivity
- Vortex Redistribution below the First-Order Transition Temperature in the β-Pyrochlore Superconductor KOs_2O_6
- Scanning Tunneling Spectroscopy in the Superconducting State and Vortex Cores of the beta-pyrochlore KOs2O6
- A new triclinic modification of the pyrochlore-type KOs2O6 superconductor
- Superconducting to spin glass state transformation in ß-pyrochlore KxOs2O6