Abstract
Complex conductivity is investigated at 19 GHz and 44 GHz in the normal state in β-pyrochlore materials, AOs2O6 (A = Cs, Rb and K). In Cs material, large enhancement of the quasiparticle (QP) scattering time, τ, is observed at low temperatures, whereas there is no such enhancement in Rb and K materials. This indicates that rattling motion is absent in Cs material, whether in K and Rb materials it plays the role as a scatterer for QPs. In Rb materials, we find charge excitation possibly originated from the rattling motion.
Original language | English |
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Journal | Physica C: Superconductivity and its applications |
Volume | 470 |
Issue number | SUPPL.1 |
DOIs | |
Publication status | Published - 2010 Dec 1 |
Externally published | Yes |
Keywords
- Cavity perturbation
- Millimeter-wave conductivity
- Rattling
- Superconductivity
- β-Pyrochlore compounds
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Energy Engineering and Power Technology
- Electronic, Optical and Magnetic Materials