Journal
PHYSICAL REVIEW B
Volume 84, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.180403
Keywords
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Funding
- [NSF-DMR 6922955]
- [NSF-DMR 1104498]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1104498] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1005434] Funding Source: National Science Foundation
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Motivated by recent experiments on the material Ba(3)NiSb(2)O(9), we consider a spin-one quantum antiferromagnet on a triangular lattice with the Heisenberg bilinear and biquadratic exchange interactions and a single-ion anisotropy. Using a fermionic triplon representation for spins, we study the phase diagram within mean-field theory. In addition to a fully gapped spin-liquid ground state, we find a state where one gapless triplon mode with a Fermi surface coexists with d + id topological pairing of the other triplons. Despite the existence of a Fermi surface, this ground state has fully gapped bulk spin excitations. Such a state has linear in-temperature specific heat and constant in-plane spin susceptibility, with an unusually high Wilson ratio.
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