Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

6-1-2013

Journal or Book Title

Physical Review B

Volume

87

Issue

22

First Page

224508

DOI

10.1103/PhysRevB.87.224508

Abstract

We demonstrate that the thermopower (S) can be used to probe the spin fluctuations (SFs) in proximity to the quantum critical point (QCP) in Fe-based superconductors. The sensitivity of S to the entropy of charge carriers allows us to observe an increase of S/T in Ba(Fe1−xCox)2As2 close to the spin-density-wave (SDW) QCP. This behavior is due to the coupling of low-energy conduction electrons to two-dimensional SFs, similar to heavy-fermion systems. The low-temperature enhancement of S/T in the Co substitution range 0.02

Comments

This article is published as Arsenijević, S., H. Hodovanets, R. Gaál, L. Forró, S. L. Bud'Ko, and P. C. Canfield. "Signatures of quantum criticality in the thermopower of Ba (Fe 1− x Co x) 2 As 2." Physical Review B 87, no. 22 (2013): 224508. DOI: 10.1103/PhysRevB.87.224508. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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