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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.12: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Microscopic phase diagram of LaFeAsO single crystals under pressure: A Mössbauer study — •Philipp Materne1, Wenli Bi2,1, Jiyong Zhao1, Michael Yu Hu1, Rhea Kappenberger3,4, Sabine Wurmehl3,4, Saicharan Aswartham3, Bernd Büchner3,4, and Esen Ercan Alp11Argonne National Laboratory, Lemont, IL 60439, USA — 2Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA — 3Leibniz Institute for Solid State and Materials Research (IFW) Dresden, D-01069, Germany — 4Institute of Solid State and Materials Physics, TU Dresden, D-01069 Dresden, Germany

We investigated a LaFeAsO single crystal by means of synchrotron Mössbauer spectroscopy under pressure up to 7.5 GPa and down to 13 K and provide a microscopic phase diagram. A continuous suppression of the magnetic hyperfine field with increasing pressure was found and it completely vanishes at ∼ 7.5 GPa which is in contrast to the behaviour in polycrystalline samples where the magnetic order vanishes at ∼ 20 GPa. We discuss the sample dependence of the magnetic order among different single and polycrystalline samples and its relationship to the structural parameters.
P. Materne et al., Phys. Rev. B. 98, 174510 (2018)

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