Spin dynamics of NiCl(2)-4SC(NH(2))(2) in the field-induced ordered phase
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/04/2012
18/04/2012
2008
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Resumo |
NiCl(2)-4SC(NH(2))(2) (known as DTN) is a spin-1 material with a strong single-ion anisotropy that is regarded as a new candidate for Bose-Einstein condensation (BEC) of spin degrees of freedom. We present a systematic study of the low-energy excitation spectrum of DTN in the field-induced magnetically ordered phase by means of high-field electron spin resonance measurements at temperatures down to 0.45 K. We argue that two gapped modes observed in the experiment can be consistently interpreted within a four-sublattice antiferromagnet model with a finite interaction between two tetragonal subsystems and unbroken axial symmetry. The latter is crucial for the interpretation of the field-induced ordering in DTN in terms of BEC. |
Identificador |
PHYSICAL REVIEW B, v.77, n.9, 2008 1098-0121 http://producao.usp.br/handle/BDPI/16272 10.1103/PhysRevB.77.092413 |
Idioma(s) |
eng |
Publicador |
AMER PHYSICAL SOC |
Relação |
Physical Review B |
Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
Palavras-Chave | #Physics, Condensed Matter |
Tipo |
article original article publishedVersion |