TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.17.1.028
TI  - LiHoF4 as a spin-half non-standard quantum Ising system
PY  - 2024/07/31
UR  - https://scipost.org/SciPostPhys.17.1.028
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 17
IS  - 1
SP  - 028
A1  - Dollberg, Tomer
AU  - Schechter, Moshe
AB  - LiHoF$_{4}$ is a magnetic material known for its Ising-type anisotropy, making it a model system for studying quantum magnetism. However, the theoretical description of LiHoF$_{4}$ using the quantum Ising model has shown discrepancies in its phase diagram, particularly in the regime dominated by thermal fluctuations. In this study, we investigate the role of off-diagonal dipolar terms in LiHoF$_{4}$, previously neglected, in determining its properties. We analytically derive the low-energy effective Hamiltonian of LiHoF$_{4}$, including the off-diagonal dipolar terms perturbatively, both in the absence and presence of a transverse field. Our results encompass the full \boldmath{$B_{x}-T$} phase diagram, confirming the significance of the off-diagonal dipolar terms in reducing the zero-field critical temperature and determining the critical temperature's dependence on the transverse field. We also highlight the sensitivity of this mechanism to the crystal structure by comparing our calculations with the Fe$_{8}$ system.
ER  -

@Article{10.21468/SciPostPhys.17.1.028,
	title={{LiHoF4 as a spin-half non-standard quantum Ising system}},
	author={Tomer Dollberg and Moshe Schechter},
	journal={SciPost Phys.},
	volume={17},
	pages={028},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.17.1.028},
	url={https://scipost.org/10.21468/SciPostPhys.17.1.028},
}