Optical evidence for mass enhancement of quasiparticles in pyrochlore Cd$_2$Re$_2$O$_7$

Details Optical evidence for mass enhancement of quasiparticles in pyrochlore Cd$_2$Re$_2$O$_7$ Optical evidence for mass enhancement of quasiparticles in pyrochlore Cd$_2$Re$_2$O$_7$

2002-06-07

arxiv.org/abs/cond-mat/0206096v1

Phys. Rev. B 66, 014534 (2002)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures. to be published in Phys. Rev. B, scheduled issue: 01 August 2002

Scientific paper

10.1103/PhysRevB.66.014534

We report on the results of optical studies of the newly discovered superconductor Cd$_2$Re$_2$O$_7$ in the normal state. We show that the compound has an exotic metallic state at low temperature. The optical conductivity spectrum exhibits two distinct features: a sharp renormalized resonance mode at zero frequency and a broad mid-infrared excitation band. Detailed analysis reveals a moderate enhancement of the effective mass at low temperature and low frequency.

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