Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

2-1-2013

Journal or Book Title

Philosophical Magazine

Volume

93

Issue

6

First Page

661

Last Page

672

DOI

10.1080/14786435.2012.729866

Abstract

Temperature-dependent, in-plane, thermoelectric power data are presented for single crystals of Ba(Fe1−x Co x )2As2 (0 ≤ x ≤ 0.05) and Ba(Fe1−x Rh x )2As2 (0 ≤ x ≤ 0.171). Given that previous thermoelectric power and angle resolved photoemission spectroscopy studies of Ba(Fe1−x Co x )2As2 delineated a rather large Co-concentration range for Lifshitz transitions to occur, and the underdoped side of the phase diagram is poorly explored, new measurements of thermoelectric power on tightly spaced concentrations of Co, 0 ≤ x ≤ 0.05, were carried out. The data suggest evidence of a Lifshitz transition, but instead of a discontinuous jump in thermoelectric power in the range 0 ≤ x ≤ 0.05, a more gradual evolution in the S(T) plots as x is increased was observed. The thermoelectric power data of Ba(Fe1−x Rh x )2As2 show very similar behavior to that of Co substituted BaFe2As2. The previously outlined Tx phase diagrams for both systems are further confirmed by these thermoelectric power data.

Comments

This is an Accepted Manuscript of an article published by Taylor & Francis in Philosophical Magazine on February 1, 2013, available online http://www.tandfonline.com/10.1080/14786435.2012.729866. Posted with permission.

Copyright Owner

Taylor & Francis Group, LLC

Language

en

File Format

application/pdf

Published Version

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