Possible Tricritical Behavior and Anomalous Lattice Softening in van der Waals Itinerant Ferromagnet Fe_3GeTe_2 under High Pressure

Jie-Min Xu; Shu-Yang Wang; Wen-Jun Wang; Yong-Hui Zhou; Xu-Liang Chen; Zhao-Rong Yang; Zhe Qu

doi:10.1088/0256-307X/37/7/076202

Possible Tricritical Behavior and Anomalous Lattice Softening in van der Waals Itinerant Ferromagnet Fe $_{3}$ GeTe $_{2}$ under High Pressure

¹Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
²Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China

Funds: Supported by the National Key Research and Development Program of China (Grant Nos. 2018YFA0305704 and 2016YFA0401804), the National Natural Science Foundation of China (Grant Nos. 11774352, U1832214, U19A2093, 11804344, U1632275, 11874362, 11704387, and U1932152), the Users with Excellence Project of Hefei Center CAS (Grant No. 2018HSC-UE012), the Major Program of Development Foundation of Hefei Center for Physical Science and Technology (Grant No. 2018ZYFX002), the Youth Innovation Promotion Association CAS (Grant No. 2020443).

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Received Date: March 09, 2020

Published Date: June 30, 2020

Abstract

Abstract

We present a high-pressure study of van der Waals ferromagnetic metal Fe $_{3}$ GeTe $_{2}$ through electrical transport and Raman scattering measurements in diamond anvil cells at pressures up to 22.4 GPa. Upon compression, the ferromagnetic transition temperature $T_{\rm c}$ manifested by a kink in resistance curve decreases monotonically and becomes undiscernable around $P_{\rm c} = 10$ GPa, indicative of suppression of the itinerant ferromagnetism. Meanwhile, by fitting the low temperature resistance to the Fermi liquid behavior of $R =R_{0} + AT^{2}$ , we found that $R_{0}$ shows a cusp-like anomaly and the coefficient $A$ diverges around $P_{\rm c}$ . These transport anomalies imply a tricritical point as commonly observed in itinerant ferromagnets under pressure. Unexpectedly, the Raman-active $E_{2g}$ and $A_{1g}$ modes soften remarkably after an initial weak hardening and the peak widths of both modes broaden evidently on approaching $P_{\rm c}$ , followed by complete disappearance of both modes above this critical pressure. A possible underlying mechanism for such anomalous lattice softening near $P_{\rm c}$ is discussed.

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Possible Tricritical Behavior and Anomalous Lattice Softening in van der Waals Itinerant Ferromagnet Fe $_{3}$ GeTe $_{2}$ under High Pressure

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Possible Tricritical Behavior and Anomalous Lattice Softening in van der Waals Itinerant Ferromagnet Fe3_{3}GeTe2_{2} under High Pressure

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Possible Tricritical Behavior and Anomalous Lattice Softening in van der Waals Itinerant Ferromagnet Fe $_{3}$ GeTe $_{2}$ under High Pressure