Spin-triplet excitons in the S=1/2 gapped antiferromagnet BaCuSi2O6: Electron paramagnetic resonance studies

Zvyagin, Sergey A.; Wosnitza, J.; Krzystek, J.; Stern, Raivo; Jaime, Marcelo; Sasago, Y.; Uchinokura, K. (2006). Spin-triplet excitons in the S=1/2 gapped antiferromagnet BaCuSi2O6: Electron paramagnetic resonance studies. Physical Review B, 73 (9), 094446-1−094446-4.10.1103/PhysRevB.73.094446.
ajakirjaartikkel
Zvyagin, Sergey A.; Wosnitza, J.; Krzystek, J.; Stern, Raivo; Jaime, Marcelo; Sasago, Y.; Uchinokura, K.
  • Inglise
Spin-triplet excitons in the S=1/2 gapped antiferromagnet BaCuSi2O6: Electron paramagnetic resonance studies
Spin-triplet excitons in the S=1/2 gapped antiferromagnet BaCuSi2O6: Electron paramagnetic resonance studies
Physical Review B
1098-0121
73
9
2006
094446-1094446-4
Ilmunud
1.1. Teadusartiklid, mis on kajastatud Web of Science andmebaasides Science Citation Index Expanded, Social Sciences Citation Index, Arts & Humanities Citation Index ja/või andmebaasis Scopus (v.a. kogumikud)
WOS

Viited terviktekstile

dx.doi.org/10.1103/PhysRevB.73.094446

Lisainfo

Received: 20 December 2005; revised: 21 February 2006; published: 29 March 2006 BaCuSi2O6, a S=1/2 quantum antiferromagnet with a double-layer structure of Cu2+ ions in a distorted planar-rectangular coordination and with a dimerized spin singlet ground state, has been studied by means of the electron paramagnetic resonance technique. It is argued that multiple absorptions observed at low temperatures are intimately related to a thermally activated spin-triplet exciton superstructure, which appears to be a characteristic feature of low-dimensional anisotropic spin-1/2 systems with the dimerized spin-singlet ground state. We showed that analysis of the angular dependence of exciton modes could be used for accurate estimation of anisotropy parameters in BaCuSi2O6; the procedure can be applied for a large number of S=1/2 quantum antiferromagnets. In addition, the temperature dependence of EPR intensity and linewidth in BaCuSi2O6 has been studied and discussed.
barium compounds; copper compounds; antiferromagnetic materials; EPR line breadth; ground states; triplet state; excitons; magnetic anisotropy
http://link.aps.org/abstract/PRB/v73/e094446
ISI