Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

4-26-2013

Journal or Book Title

Physical Review Letters

Volume

110

Issue

17

First Page

176402

DOI

10.1103/PhysRevLett.110.176402

Abstract

We report measurements of the electrical and thermal transport on the hexagonal heavy-fermion metal YbAgGe for temperatures T≥40  mK and in magnetic fields H∥ab up to 14 T. This distorted kagome-lattice system displays a series of magnetic states and a quantum critical point at Hc=4.5  T. The Lorenz ratio L(T)/L0 displays a marked reduction only close to Hc. A T-linear contribution below 120 mK, present at all different fields, allows us to extrapolate the Lorenz ratio towards T=0. At the critical field this yields L/L0=0.92±0.03, suggesting a violation of the Wiedemann-Franz law due to strong inelastic scattering.

Comments

This article is published as Dong, J. K., Y. Tokiwa, S. L. Bud’ko, P. C. Canfield, and P. Gegenwart. "Anomalous reduction of the Lorenz ratio at the quantum critical point in YbAgGe." Physical Review Letters 110, no. 17 (2013): 176402. DOI: 10.1103/PhysRevLett.110.176402. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

Share

COinS