Superconducting Transition in the β-Pyrochlore AOs2O6 (A = Cs, Rb, K) under Pressure

2008/02/08 by Kiyotaka Miyoshi, K. Miyoshi, Y. Takaichi +7
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Nuclear materials and radiation effects #cond-mat.supr-con

paper · pdf · doi:10.1143/jpsj.77.043704

published as J. Phys. Soc. Jpn. 77, 043704 (2008) · 4 pages, 4 figures, to be published in J. Phys. Soc. Jpn. Vol. 77, No. 4 (2008)

arxiv created 2008/02/08 · openalex publication_date 2008/03/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Pressure dependence of superconducting transition temperature T_{\rm c} has been determined through the DC magnetic measurements under pressure up to P=10 GPa for β-pyrochlore oxides AOs₂O₆ with A=Cs (T_{\rm c}=3.3 K), Rb (6.3 K) and K (9.6 K). Both for A=Rb and Cs, T_{\rm c} increases with increasing P and shows a saturation at T_{\rm cm}∼8.8 K, which is considered as the upper limit of T_{\rm c} inherent in AOs₂O₆. In contrast, the T_{\rm c}-P curve for KOs₂O₆ shows a sharp maximum of ∼10 K at P∼0.5 GPa, and T_{\rm c} is higher than T_{\rm cm} for 0\leqP≤1.5GPa, suggesting the enhanced superconductivity due to the rattling of K ions.

Citations

• Effects of Rattling Phonons on the Dynamics of Quasiparticle Excitation in theβ-PyrochloreKOs2O6Superconductor
• Pressure Effects on the Transition Temperature and the Magnetic Field Penetration Depth in the Pyrochlore SuperconductorRbOs2O6