# 15th International Conference on Muon Spin Rotation, Relaxation and Resonance

28 August 2022 to 2 September 2022
Science and Technology Campus, University of Parma
Europe/Rome timezone
Submission deadline for Conference Proceedings extended until 3 October

## Inducing Quantum Criticality in CrCl$_3$ Under Pressure

28 Aug 2022, 14:00
15m
Aula dei Cavalieri, University Central Palace, via Università 12

#### Aula dei Cavalieri, University Central Palace, via Università 12

Oral Spin liquids and related phenomena

### Speaker

Yuqing Ge (Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden)

### Description

Accelerated by the discovery of graphene, research on two-dimensional (2D) materials have attracted tremendous attention both from fundamental and applied sciences. Among the large number of 2D materials, chromium trihalides CrX3 (X = Cl, Br, I) van der Waals (vdW) magnets have also raised a large interest due to the existence of many magnetic subtleties that cannot be explained by their magnetic and/or structural transitions.
Numerous studies were performed on CrI3, but only a few have been reported so far on its analogue CrCl3. The 2D vdW CrCl3 compound is stabilized under a rhombohedral symmetry, consisting of 2D Cr layers arranged in a honeycomb web fashion and surrounded by octahedrally coordinated Cl, with weak vdW inter-layers coupling. The layer structure and inter-layer coupling make CrCl3 an ideal system to study under external stimuli such as pressure or magnetic field, where new intriguing states of matter can be unveiled. With such expectations, studies of CrCl3 under room temperature, high pressure have been reported[1]. However, its spin dynamics at low-temperature and high-pressure regime remain unexplored.
In this study, we present the results of our recent muon spin rotation (MuSR) investigations performed on hydrostatically pressured CrCl3. Our previous MuSR results at ambient pressure revealed successive transitions from paramagnetic to short-ranged-order-ferromagnetic then to antiferromagnetic states with strong spin dynamics as the temperature decreases[2]. When applying pressure, we observed that the magnetic ground state is gradually suppressed. A linear extrapolation points toward the suppression of magnetism at about $p_c$= 30 kbar indicating the possible existence of a quantum critical point at $p_c$.[3]

[1] Ahmad, Azkar Saeed, et al. "Pressure-driven switching of magnetism in layered CrCl3." Nanoscale 12.45 (2020): 22935-22944.
[2] Forslund, Ola Kenji, et al. "Spin dynamics in the Van der Waals magnet CrCl3." arXiv preprint arXiv:2111.06246 (2021).
[3] Ge, Yuqing, et al., in preparation.

### Primary author

Yuqing Ge (Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden)

### Co-authors

Dr Ola Kenji Forslund (Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden; Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden) Konstantinos Papadopoulos (Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden) Ms Elisabetta Nocerino (Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, ) Gaia Di Berardino (Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden) Frank Elson (Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden) Prof. Hiroto Ohta (Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan) Dr Ritu Gupta (Paul Scherrer Institute, Laboratory for Muon Spin Spectroscopy, CH-5232 PSI Villigen, Switzerland) Dr Rustem Khasanov (Paul Scherrer Institute, Laboratory for Muon Spin Spectroscopy, CH-5232 PSI Villigen, Switzerland) Jun Sugiyama (Neutron Science and Technology Center, Comprehensive Research,Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan; Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan) Prof. Daniel Andreica (Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania) Prof. Mahmoud Abdel-Hafiez (Department of Physics and Astronomy, Uppsala University, Ångströmlaboratoriet, SE-75120 Uppsala, Sweden) Prof. Martin Mansson (Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden) Prof. Yasmine Sassa (Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden)

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