Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 16: Frustrated Magnets
MA 16.11: Talk
Tuesday, September 6, 2022, 17:30–17:45, H37
Pressure induced multicritical behaviour in a kagome ferromagnet — •Arvind Maurya — Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
We report high quality single crystal growth of ferromagnetURhSn, crystallizing in ZrNiAl- type hexagonal structure in which the magnetic U-atoms form potentially frustrated quasi-kagome two-dimensional net. Our measurements of electrical transport under hydrostatic pressures up to 11 GPa reveals two bicritical points concurrent at PC = 6.25 GPa corresponding to its successive double phase transitions (TO = 54 K, TC = 18 K at ambient). Rermakably, the intermediate phase remains hidden as local probes like neutron scattering and Mössbauer spectra do not capture any new feature across the TO. Our low temperature resistivity data under pressure points out a Fermi surface reconstruction across the PC, corresponding to an unconventional class of quantum phase transition involving multicritical points. This picture is further ascertained by gradual development of -lnT behavior in 5f-derived electrical resistivity and appearance of T5/3 dependence in the pressure induced phase.