Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Fe-based Superconductors - Other Materials and Theory

TT 15.8: Vortrag

Montag, 1. April 2019, 16:45–17:00, H23

Bandwidth controlled insulator-metal transition in BaFe2S3: A Mössbauer study under pressure — •Philipp Materne1, Wenli Bi2,1, Jiyong Zhao1, Michael Yu Hu1, Maria Lourdes Amigó3, Silvia Seiro3, 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

BaFe2S3 is a quasi one-dimensional Mott insulator that orders antiferromagnetically below 117(5) K. The application of pressure induces a transition to a metallic state, and superconductivity emerges. The evolution of the magnetic behavior on increasing pressure has up to now been either studied indirectly by means of transport measurements, or by using local magnetic probes only in the low pressure region. Here, we investigate the magnetic properties of BaFe2S3 up to 9.9 GPa by means of synchrotron 57Fe Mössbauer spectroscopy experiments, providing the first local magnetic phase diagram. The magnetic ordering temperature increases up to 185(5) K at 7.5 GPa, and is fully suppressed at 9.9 GPa. The low-temperature magnetic hyperfine field is continuously reduced from 12.9 to 10.3 T between 1.4 and 9.1 GPa, followed by a sudden drop to zero at 9.9 GPa indicating a first-order phase transition.

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