Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.35: Poster
Monday, March 31, 2014, 15:00–19:00, P2
A light scattering study of detwinned BaFe2As2 — •Andreas Baum1, Andreas Walter1, Bernhard Muschler1, Florian Kretzschmar1, Jiun-Haw Chu2,3, James G. Analytis2,3, Ian R. Fisher2,3, and Rudi Hackl1 — 1Walther-Meissner-Institut, 85748 Garching, Germany — 2SIMES, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA — 3GLAM and Department of Applied Physics, Stanford, University, Stanford, CA 94305, USA
The magneto-structural phase transition of BaFe2As2 is studied by Raman spectroscopy with a focus on lattice dynamics. Using uniaxial pressure to detwin the sample allows us to resolve anisotropic features as well as a separation of the structural and magnetic phase transitions.
The As A1g phonon shows a resonance at high energies. With the polarizations aligned along either the antiferromagnetically or the ferromagnetically ordered direction the resonance profile is distinctly different.
The splitting of the Eg phonon at 135 cm−1 into two modes having B2g and B3g symmetry can be attributed to the transition into the magnetically ordered state rather than the structural transition.