Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.55: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Pressure induced insulator-to-metal transition in FePS3 — •Matthew John Coak1, Charles Robert Sebastian Haines1, 2, and Siddarth Shankar Saxena11Cavendish Laboratory, University of Cambridge — 2CamCool Research Ltd UK

FePS3 is structurally and magnetically two-dimensional, with a magnetic ground state in which spins are ordered as ferromagnetic chains coupled antiferromagnetically. At ambient pressure, it is an insulator with a direct gap of approximately 0.5 eV and a room temperature resistivity of approximately 104 Ωcm. We present the results of exploratory resistivity, magnetisation and dielectric measurements under pressure for this material. The insulating phase is suppressed at a pressure in the range 40-70 kbar giving way to a new metallic phase. As yet unexplained intermediate behaviour is seen at pressures around the transition. At high pressure, the resistivity develops linear temperature dependence similar to that observed in Cuprates. At lower temperature, there is an upturn in resistivity which may indicate a low temperature phase transition or impurity scattering.

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DPG-Physik > DPG-Verhandlungen > 2015 > Berlin