A semimetal model of the normal state magnetic susceptibility and transport properties of Ba(Fe1-xCox)2As2

B. C. Sales; M. A. McGuire; A. S. Sefat; D. Mandrus

doi:10.1016/j.physc.2010.01.043

A semimetal model of the normal state magnetic susceptibility and transport properties of Ba(Fe_1-xCo_x)₂As₂

B. C. Sales, M. A. McGuire, A. S. Sefat, D. Mandrus

Correlated Electron Materials

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

A simple two-band 3D model of a semimetal is constructed to determine which normal state features of the Ba(Fe_1-xCo_x)₂As₂ superconductors can be qualitatively understood within this framework. The model is able to account in a semiquantitative fashion for the measured magnetic susceptibility, Hall, and Seebeck data, and the low temperature Sommerfeld coefficient for 0 < x < 0.3 with only three parameters for all x. The purpose of the model is not to fit the data but to provide a simple starting point for thinking about the physics of these interesting materials. Although many of the static magnetic properties, such as the increase of the magnetic susceptibility with temperature, are reproduced by the model, none of the spin-fluctuation dynamics are addressed. A general conclusion from the model is that the magnetic susceptibility of most semimetals should increase with temperatures.

Original language	English
Pages (from-to)	304-308
Number of pages	5
Journal	Physica C: Superconductivity and its Applications
Volume	470
Issue number	4
DOIs	https://doi.org/10.1016/j.physc.2010.01.043
State	Published - Feb 15 2010

Funding

It is a pleasure to acknowledge useful discussions with David Singh and David Johnston. Research sponsored by the Division of Materials Sciences and Engineering, Office of Basic Energy Sciences. Part of this research was performed by Eugene P. Wigner Fellows at ORNL.

Funders	Funder number
Basic Energy Sciences
Division of Materials Sciences and Engineering

Keywords

BaFeAs
Co-doping
Iron-based superconductors
Normal state properties
Phenomenological model

Access to Document

10.1016/j.physc.2010.01.043

Cite this

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abstract = "A simple two-band 3D model of a semimetal is constructed to determine which normal state features of the Ba(Fe1-xCox)2As2 superconductors can be qualitatively understood within this framework. The model is able to account in a semiquantitative fashion for the measured magnetic susceptibility, Hall, and Seebeck data, and the low temperature Sommerfeld coefficient for 0 < x < 0.3 with only three parameters for all x. The purpose of the model is not to fit the data but to provide a simple starting point for thinking about the physics of these interesting materials. Although many of the static magnetic properties, such as the increase of the magnetic susceptibility with temperature, are reproduced by the model, none of the spin-fluctuation dynamics are addressed. A general conclusion from the model is that the magnetic susceptibility of most semimetals should increase with temperatures.",

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