Spin-triplet excitons and anisotropy effects in the S=1/2 gapped antiferromagnet BaCuSi2O6

Zvyagin, S. A.; Wosnitza, J.; Krzystek, J.; Stern, R.; Jaime, M.; Sasago, Y.; Uchinokura, K. (2007). Spin-triplet excitons and anisotropy effects in the S=1/2 gapped antiferromagnet BaCuSi2O6. J. Magn. Magn. Mater., 310 (2), 1206−1208.10.1016/j.jmmm.2006.10.323.
ajakirjaartikkel
Zvyagin, S. A.; Wosnitza, J.; Krzystek, J.; Stern, R.; Jaime, M.; Sasago, Y.; Uchinokura, K.
  • Inglise
J. Magn. Magn. Mater.
0304-8853
310
2
2007
12061208
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/10.1016/j.jmmm.2006.10.323

Lisainfo

BaCuSi2O6 can be regarded as an almost ideal realization of an S = (1)/(2) system of weakly interacting spin dimers with spin-singlet ground state and gapped excitation spectrum. We argue that the fine structure observed in low-temperature EPR spectra of BaCuSi2O6 is a fingerprint of triplet excitations (excitons). Analyzing the angular dependence of the exciton modes allows us to precisely calculate the zero-field splitting within the triplet states and, correspondingly, the anisotropy parameter, D = 0.07 cm(-1). The proposed procedure can be applied for studying anisotropy effects in a large number of S = (1)/(2) gapped quantum antiferromagnets with dimerized or alternating spin structure. (c) 2006 Elsevier B.V. All rights reserved.
gapped antiferromagnet; EPR; dimer; excitons
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