Spin Dynamics of $NiC{l}_2-4SC(N{H}_2{)}_2$ in the Field-Induced Ordered Phase

Abstract

$NiC{l}_2$-$4SC(N{H}_2{)}_2$ (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.

4 pages, 3 figures

References in corpus (3)

• Bose-Einstein Condensation of Magnons in Cs2CuCl4
• Spin-resonance modes of the spin-gap magnet TlCuCl_3
• Magnetostriction in the Bose-Einstein Condensate quantum magnet NiCl2-4SC(NH2)2

Cited by in corpus (8)

• Low-Temperature Heat Transport in the Low-Dimensional Quantum Magnet NiCl_{2}-4SC(NH_{2})_{2}
• U(1)-Symmetry breaking and violation of axial symmetry in TlCuCl3 and other insulating spin systems
• Critical exponents and intrinsic broadening of the field-induced transition in NiCl${}_2$$\cdot$4SC(NH${}_2$)${}_2$
• Effective S=1/2 description of the S=1 chain with strong easy plane anisotropy
• Modes of magnetic resonance of S=1 dimer chain compound NTENP
• Spin dynamics of the anisotropic spin-1 antiferromagnetic chain at finite magnetic fields
• Antiferromagnet with two coupled antiferromagnetic sublattices in a magnetic field
• Bose-Einstein Condensation of Magnons in NiCl2-4SC(NH2)2