Emergent Ising degrees of freedom above a doublestripe magnetic ground state [Emergent Ising degrees of freedom above doublestripe magnetism]
Abstract
Here, doublestripe magnetism [Q=(π/2,π/2)] has been proposed as the magnetic ground state for both the irontelluride and BaTi_{2}Sb_{2}O families of superconductors. Doublestripe order is captured within a J_{1}–J_{2}–J_{3} Heisenberg model in the regime J_{3} >> J_{2} >> J_{1}. Intriguingly, besides breaking spinrotational symmetry, the groundstate manifold has three additional Ising degrees of freedom associated with bond ordering. Via their coupling to the lattice, they give rise to an orthorhombic distortion and to two nonuniform lattice distortions with wave vector (π,π). Because the ground state is fourfold degenerate, modulo rotations in spin space, only two of these Ising bond order parameters are independent. Here, we introduce an effective field theory to treat all Ising order parameters, as well as magnetic order, and solve it within a largeN limit. All three transitions, corresponding to the condensations of two Ising bond order parameters and one magnetic order parameter are simultaneous and first order in three dimensions, but lower dimensionality, or equivalently weaker interlayer coupling, and weaker magnetoelastic coupling can split the three transitions, and in some cases allows for two separate Ising phase transitions above the magnetic one.
 Authors:

 Ames Lab. and Iowa State Univ., Ames, IA (United States)
 Publication Date:
 Research Org.:
 Ames Lab., Ames, IA (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1417354
 Alternate Identifier(s):
 OSTI ID: 1414976
 Report Number(s):
 ISJ9554
Journal ID: ISSN 24699950; PRBMDO; TRN: US1801040
 Grant/Contract Number:
 AC0207CH11358; PHYS1066293
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 96; Journal Issue: 21; Journal ID: ISSN 24699950
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Zhang, Guanghua, and Flint, Rebecca. Emergent Ising degrees of freedom above a doublestripe magnetic ground state [Emergent Ising degrees of freedom above doublestripe magnetism]. United States: N. p., 2017.
Web. https://doi.org/10.1103/PhysRevB.96.214438.
Zhang, Guanghua, & Flint, Rebecca. Emergent Ising degrees of freedom above a doublestripe magnetic ground state [Emergent Ising degrees of freedom above doublestripe magnetism]. United States. https://doi.org/10.1103/PhysRevB.96.214438
Zhang, Guanghua, and Flint, Rebecca. Wed .
"Emergent Ising degrees of freedom above a doublestripe magnetic ground state [Emergent Ising degrees of freedom above doublestripe magnetism]". United States. https://doi.org/10.1103/PhysRevB.96.214438. https://www.osti.gov/servlets/purl/1417354.
@article{osti_1417354,
title = {Emergent Ising degrees of freedom above a doublestripe magnetic ground state [Emergent Ising degrees of freedom above doublestripe magnetism]},
author = {Zhang, Guanghua and Flint, Rebecca},
abstractNote = {Here, doublestripe magnetism [Q=(π/2,π/2)] has been proposed as the magnetic ground state for both the irontelluride and BaTi2Sb2O families of superconductors. Doublestripe order is captured within a J1–J2–J3 Heisenberg model in the regime J3 >> J2 >> J1. Intriguingly, besides breaking spinrotational symmetry, the groundstate manifold has three additional Ising degrees of freedom associated with bond ordering. Via their coupling to the lattice, they give rise to an orthorhombic distortion and to two nonuniform lattice distortions with wave vector (π,π). Because the ground state is fourfold degenerate, modulo rotations in spin space, only two of these Ising bond order parameters are independent. Here, we introduce an effective field theory to treat all Ising order parameters, as well as magnetic order, and solve it within a largeN limit. All three transitions, corresponding to the condensations of two Ising bond order parameters and one magnetic order parameter are simultaneous and first order in three dimensions, but lower dimensionality, or equivalently weaker interlayer coupling, and weaker magnetoelastic coupling can split the three transitions, and in some cases allows for two separate Ising phase transitions above the magnetic one.},
doi = {10.1103/PhysRevB.96.214438},
journal = {Physical Review B},
number = 21,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}
Figures / Tables:
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