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Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconductivity: Fe-based Superconductors – 122 and 111

TT 31.5: Vortrag

Dienstag, 17. März 2015, 10:45–11:00, H 2053

Phase transitions and phase separation in undoped and Rh doped CaFe2As2Vladimir Gnezdilov1,2, •Peter Lemmens1, Yurii Pachkevich3, Tetiana Shevtsova3, Masataka Danura4, Masakazu Kobayashi4, Tasuku Mizukami4, Kazutaka Kudo4, and Minoru Nohara41IPKM, TU-BS, Braunschweig — 2ILTPE NAS, Ukraine — 3DonFTI, Donetsk, Ukraine — 4Department of Physics, Okayama, Japan

Iron-pnictides Ca(Fe1-xRhx)2As2 (x = 0, 0.035 and 0.19) were studied across the tetragonal-orthorhombic and tetragonal collapsed tetragonal phase transitions using Raman spectroscopy. Effects of phase separation were observed in the high-temperature phase for the first time. An orbital order scenario at low temperatures for the Rh doped samples which requires a symmetry lowering down to P4/mnc or I422 without atomic displacements relative to the parent I4/mmm symmetry is discussed.

Work supported by RTG-DFG 1953/1, Metrology for Complex Nanosystems.

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