High-resolution x-ray scattering studies of structural phase transitions in Ba(Fe1 xCrx)2As2

Journal Article · Sun Jan 01 04:00:00 EST 2012 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.85.054115· OSTI ID:1037685

Clancy, J. P. ^[1]; Gaulin, B. D. ^[1]; Safa-Sefat, Athena ^[2]

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1. McMaster University
2. ORNL

We have performed high-resolution x-ray scattering measurements on single-crystal samples of Ba(Fe{sub 1-x}Cr{sub x}){sub 2}As{sub 2} (0 {le} x {le} 0.335). These measurements examine the effect of Cr doping on the high-temperature tetragonal (I4/mmm) to low-temperature orthorhombic (Fmmm) structural phase transition of the parent compound BaFe{sub 2}As{sub 2}. Increasing Cr concentration is found to suppress the structural transition temperature (T{sub s}) and reduce the magnitude of the orthorhombic strain ({delta}). The doping dependence of the orthorhombic strain, combined with complementary measurements of the high-temperature magnetic susceptibility, suggests the presence of a magnetostructural crossover at x {approx} 0.05. In particular, this crossover appears to mark a shift from strong to weak orthorhombicity and from predominantly itinerant to localized magnetic behavior.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1037685
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 5 Vol. 85; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
MAGNETIC SUSCEPTIBILITY
SCATTERING
STRAINS
TRANSITION TEMPERATURE