Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

10-1-2011

Journal or Book Title

Physical Review B

Volume

84

Issue

13

First Page

134525

DOI

10.1103/PhysRevB.84.134525

Abstract

The ab plane resistivity of Ba(Fe1−xRux)2As2 (x=0.00, 0.09, 0.16, 0.21, and 0.28) was studied under nearly hydrostatic pressures, up to 7.4 GPa, in order to explore the T−P phase diagram and to compare the combined effects of isoelectronic Ru substitution and pressure. The parent compound BaFe2As2 exhibits a structural/magnetic phase transition near 134 K. At ambient pressure, progressively increasing Ru concentration suppresses this phase transition to lower temperatures at an approximate rate of ∼5 K/% Ru correlated with the emergence of superconductivity. By applying pressure to this system, a similar behavior is seen for each concentration: the structural/magnetic phase transition is further suppressed and superconductivity induced and ultimately, for larger x Ru and P, suppressed. A detailed comparison of the T−P phase diagrams for all Ru concentrations shows that 3 GPa of pressure is roughly equivalent to 10% Ru substitution. Furthermore, due to the sensitivity of Ba(Fe1−xRux)2As2 to pressure conditions, the melting of the liquid media, 4:6 light mineral oil : n-pentane and 1:1 isopentane : n-pentane, used in this study could be readily seen in the resistivity measurements. This feature was used to determine the freezing curves for these media and to infer their room temperature, hydrostatic limits: 3.5 and 6.5 GPa, respectively.

Comments

This article is published as Kim, S. K., M. S. Torikachvili, E. Colombier, A. Thaler, S. L. Bud'ko, and P. C. Canfield. "Combined effects of pressure and Ru substitution on BaFe 2 As 2." Physical Review B 84, no. 13 (2011): 134525. DOI: 10.1103/PhysRevB.84.134525. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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