Rattling-Induced Superconductiviy in the β-Pyrochlore Oxides <I>A</I>Os<SUB>2</SUB>O<SUB>6</SUB>

DOI DOI Web Site BIBCODE 54 Citations 106 References Open Access

Bibliographic Information

Other Title
  • Rattling-induced superconductiviy in the β-pyrochlore oxides AOs2O6

Description

The superconducting properties of two β-pyrochlore oxides, CsOs2O6 and RbOs2O6, are studied by thermodynamic and transport measurements using high-quality single crystals. It is shown that the character of superconductivity changes systematically from weak coupling for CsOs2O6 to moderately strong coupling for RbOs2O6, and finally to extremely strong coupling with BCS-type superconductivity for KOs2O6, with increasing Tc. Strong-coupling correction analyses of the superconducting properties reveal that a low-energy rattling mode of the alkali metal ions is responsible for the mechanism of the superconductivity in each compound. The large enhancement of Tc from Cs to K is attributed to the increase in the electron–rattler coupling with decreasing characteristic energy of the rattling and with increasing anharmonicity. The existence of weak anisotropy in the superconducting gap or in the electron–rattler interactions is found for the Cs and Rb compounds.

Journal

Citations (54)*help

See more

References(106)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top