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@article{2393299,
author = {Chaloupka, Jiří},
article_location = {College PK},
article_number = {2},
doi = {http://dx.doi.org/10.1103/PhysRevB.109.L020403},
keywords = {Mott insulators; Linear spin wave theory; Exchange interaction; Frustrated magnetism; Magnetic order; Quantum phase transitions; Spin dynamics},
language = {eng},
issn = {2469-9950},
journal = {Physical Review B},
title = {Emergent transverse-field Ising model in d4 spin-orbit Mott insulators},
url = {https://arxiv.org/abs/2401.02532},
volume = {109},
year = {2024}
}
TY - JOUR
ID - 2393299
AU - Chaloupka, Jiří
PY - 2024
TI - Emergent transverse-field Ising model in d4 spin-orbit Mott insulators
JF - Physical Review B
VL - 109
IS - 2
SP - 1-6
EP - 1-6
PB - American Physical Society
SN - 24699950
KW - Mott insulators
KW - Linear spin wave theory
KW - Exchange interaction
KW - Frustrated magnetism
KW - Magnetic order
KW - Quantum phase transitions
KW - Spin dynamics
UR - https://arxiv.org/abs/2401.02532
N2 - Mott-insulating transition metal oxides containing t<SUB>2</SUB><SUP>g 4</SUP> ions with strong spin-orbit coupling were recently demonstrated to display unusual magnetism due to a dynamical mixing of the low-energy multiplet states via exchange processes. Here we derive exchange interactions in the situation where a tetragonal or trigonal crystal field selects a single relevant excited state on top of the singlet ionic ground state, producing an effective spin-1/2 . We show that these moments universally obey antiferromagnetic transverse-field Ising model (TFIM) with an intrinsic transverse field generated by the splitting of the two ionic singlets. Using Ru<SUP>4 +</SUP> as a example ion, we provide quantitative estimates of the exchange and illustrate the emergent TFIM physics based on phase diagrams and excitation spectra obtained for several 2D lattices—square, honeycomb, as well as for the frustrated triangular lattice.
ER -
CHALOUPKA, Jiří. Emergent transverse-field Ising model in d4 spin-orbit Mott insulators. \textit{Physical Review B}. College PK: American Physical Society, 2024, vol.~109, No~2, p.~1-6. ISSN~2469-9950. Available from: https://dx.doi.org/10.1103/PhysRevB.109.L020403.
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