Scaling of the Stress and Temperature Dependence of the Optical Anisotropy in Ba(Fe1-x Co x )2As2

Mirri, C.; Dusza, A.; Bastelberger, S.; Chu, J. -H.; Kuo, H. -H.; Fisher, I. R.; Degiorgi, L.

doi:10.1007/s10948-016-3773-y

Title: Scaling of the Stress and Temperature Dependence of the Optical Anisotropy in Ba(Fe_1-x Co _x )₂As₂

Journal Article · Thu Sep 15 00:00:00 EDT 2016 · Journal of Superconductivity and Novel Magnetism

DOI: https://doi.org/10.1007/s10948-016-3773-y · OSTI ID:1361130

Mirri, C. ^[1]; Dusza, A. ^[1]; Bastelberger, S. ^[1]; Chu, J. -H. ^[2]; Kuo, H. -H. ^[2]; Fisher, I. R. ^[2]; Degiorgi, L. ^[1]

Federal Inst. of Technology, Zurich (Switzerland). Laboratorium fur Festkorperphysik
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials; Stanford Univ., CA (United States). Dept. of Applied Physics

We revisit our recent investigations of the optical properties in the underdoped regime of the title compounds with respect to their anisotropic behavior as a function of both temperature and uniaxial stress across the ferro-elastic tetragonal-to-orthorhombic transition. By exploiting a dedicated pressure device, we can tune and control uniaxial stress in situ thus changing the degree of detwinning of the samples in the orthorhombic SDW state as well as pressure-inducing an orthorhombicity in the paramagnetic tetragonal phase. Here we discover a hysteretic behavior of the optical anisotropy; its stress versus temperature dependence across the structural transition bears testimony to the analogy with the magnetic-field versus temperature dependence of the magnetization in a ferromagnet when crossing the Curie temperature. In this context, we find furthermore an intriguing scaling of the stress and temperature dependence of the optical anisotropy in Ba(Fe_1-xCo_x)₂As₂.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Swiss National Science Foundation (SNSF)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1361130

Journal Information:: Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 12 Vol. 29; ISSN 1557-1939

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Scaling of the Stress and Temperature Dependence of the Optical Anisotropy in Ba(Fe_1-x Co _x )₂As₂