Full-gap superconductivity with strong electron correlations in the -pyrochlore KOs2O6

✍ Scribed by Y. Kasahara; Y. Shimono; T. Kato; K. Hashimoto; T. Shibauchi; Y. Matsuda; S. Yonezawa; Y. Muraoka; J. Yamaura; Y. Nagao; Z. Hiroi

• Book ID: 104080045
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 159 KB
• Volume: 403
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2007.10.090

✦ Synopsis

To elucidate the superconducting gap structure and the influence of rattling motion on quasiparticle dynamics in the superconducting state of KOs 2 O 6 , the thermal conductivity and microwave surface impedance were measured at low temperatures. The magnetic field dependence of thermal conductivity and temperature dependence of penetration depth demonstrate full-gap superconductivity in KOs 2 O 6 . The quasiparticle scattering time is strongly enhanced in the superconducting state, indicating a strong electron inelastic scattering in the normal state. These results highlight that KOs 2 O 6 is unique among superconductors with strong electron correlations.