Document Type

Article

Publication Date

8-26-2013

Journal or Book Title

Physical Review B

Volume

88

First Page

064513

DOI

10.1103/PhysRevB.88.064513

Abstract

We report thermal expansion measurements on Ca(Fe1−xCox)2As2 single crystals with different thermal treatment, with samples chosen to represent four different ground states observed in this family. For all samples, thermal expansion is anisotropic with different signs of the in-plane and c-axis thermal expansion coefficients in the high temperature, tetragonal phase. The features in thermal expansion associated with the phase transitions are of opposite signs as well, pointing to a different response of transition temperatures to the in-plane and the c-axis stress. These features, and consequently the inferred pressure derivatives, are very large, clearly and substantially exceeding those in the Ba(Fe1−xCox)2As2 family. For all transitions the c-axis response is dominant.

Comments

This article is from Physical Review B 88 (2013): 064513, doi:10.1103/PhysRevB.88.064513. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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