Spin dynamics of NiCl(2)-4SC(NH(2))(2) in the field-induced ordered phase


Autoria(s): ZVYAGIN, S. A.; WOSNITZA, J.; KOLEZHUK, A. K.; ZAPF, V. S.; JAIME, M.; Paduan Filho, Armando; GLAZKOV, V. N.; SOSIN, S. S.; SMIRNOV, A. I.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/04/2012

18/04/2012

2008

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

http://dx.doi.org/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