Unconventional magnetic field response of the hyperhoneycomb Kitaev magnet
Abstract
We present a unified description of the response of the hyperhoneycomb Kitaev magnet β–Li2IrO3 to applied magnetic fields along the orthorhombic directions a, b, and c. This description is based on the minimal nearest-neighbor J–K–Γ model and builds on the idea that the incommensurate counter-rotating order observed experimentally at zero field can be treated as a long-distance twisting of a nearby commensurate order with six spin sublattices. The results reveal that the behavior of the system for H∥a, H∥b, and H∥c share a number of qualitative features, including (i) a strong intertwining of the modulated, counter-rotating order with a set of uniform orders; (ii) the disappearance of the modulated order at a critical field H*, whose value is strongly anisotropic with $H$ $$^{*}_{b}$$ < $H$ $$^{*}_{c}$$ << $H$ $$^{*}_{a}$$; (iii) the presence of a robust zigzag phase above H*; and (iv) the fulfillment of the Bragg peak intensity sum rule. It is noteworthy that the disappearance of the modulated order for H∥c proceeds via a “metamagnetic” first-order transition which does not restore all broken symmetries. This implies the existence of a second finite-T phase transition at higher magnetic fields. We also demonstrate that quantum fluctuations give rise to a significant reduction of the local moments for all directions of the field. The results for the total magnetization for H∥b are consistent with available data and confirm a previous assertion that the system is very close to the highly frustrated K–Γ line in parameter space. Our predictions for the magnetic response for fields along a and c await experimental verification.
- Publication Date:
- Research Org.:
- Univ. of Minnesota, Minneapolis, MN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1593185
- Alternate Identifier(s):
- OSTI ID: 1637704
- Grant/Contract Number:
- SC0018056; PHY-1607611
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Research
- Additional Journal Information:
- Journal Name: Physical Review Research Journal Volume: 2 Journal Issue: 1; Journal ID: ISSN 2643-1564
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Holstein-Primakoff method; Landau-Lifschitz-Gilbert equation; Monte Carlo methods
Citation Formats
Li, Mengqun, Rousochatzakis, Ioannis, and Perkins, Natalia B. Unconventional magnetic field response of the hyperhoneycomb Kitaev magnet β − Li 2 IrO 3. United States: N. p., 2020.
Web. doi:10.1103/PhysRevResearch.2.013065.
Li, Mengqun, Rousochatzakis, Ioannis, & Perkins, Natalia B. Unconventional magnetic field response of the hyperhoneycomb Kitaev magnet β − Li 2 IrO 3. United States. https://doi.org/10.1103/PhysRevResearch.2.013065
Li, Mengqun, Rousochatzakis, Ioannis, and Perkins, Natalia B. Wed .
"Unconventional magnetic field response of the hyperhoneycomb Kitaev magnet β − Li 2 IrO 3". United States. https://doi.org/10.1103/PhysRevResearch.2.013065.
@article{osti_1593185,
title = {Unconventional magnetic field response of the hyperhoneycomb Kitaev magnet β − Li 2 IrO 3},
author = {Li, Mengqun and Rousochatzakis, Ioannis and Perkins, Natalia B.},
abstractNote = {We present a unified description of the response of the hyperhoneycomb Kitaev magnet β–Li2IrO3 to applied magnetic fields along the orthorhombic directions a, b, and c. This description is based on the minimal nearest-neighbor J–K–Γ model and builds on the idea that the incommensurate counter-rotating order observed experimentally at zero field can be treated as a long-distance twisting of a nearby commensurate order with six spin sublattices. The results reveal that the behavior of the system for H∥a, H∥b, and H∥c share a number of qualitative features, including (i) a strong intertwining of the modulated, counter-rotating order with a set of uniform orders; (ii) the disappearance of the modulated order at a critical field H*, whose value is strongly anisotropic with $H$ $^{*}_{b}$ < $H$ $^{*}_{c}$ << $H$ $^{*}_{a}$; (iii) the presence of a robust zigzag phase above H*; and (iv) the fulfillment of the Bragg peak intensity sum rule. It is noteworthy that the disappearance of the modulated order for H∥c proceeds via a “metamagnetic” first-order transition which does not restore all broken symmetries. This implies the existence of a second finite-T phase transition at higher magnetic fields. We also demonstrate that quantum fluctuations give rise to a significant reduction of the local moments for all directions of the field. The results for the total magnetization for H∥b are consistent with available data and confirm a previous assertion that the system is very close to the highly frustrated K–Γ line in parameter space. Our predictions for the magnetic response for fields along a and c await experimental verification.},
doi = {10.1103/PhysRevResearch.2.013065},
journal = {Physical Review Research},
number = 1,
volume = 2,
place = {United States},
year = {2020},
month = {1}
}
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https://doi.org/10.1103/PhysRevResearch.2.013065
https://doi.org/10.1103/PhysRevResearch.2.013065
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FIG. 1: Sketch of a hyperhoneycomb lattice. The five NN bonds of the J-K-Γ model are shown by solid (dashed) red lines for t ∈ {x, x′}, solid (dashed) green lines for t ∈ {y, y′}, and solid blue lines for t ∈ {z}.
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