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Article overview
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Field Induced Magnetic Ordering and Single-ion Anisotropy in the Quasi-1D Haldane Chain Compound SrNi2V2O8: A Single Crystal investigation | A. K. Bera
; B. Lake
; A. T. M. N. Islam
; B. Klemke
; E. Faulhaber
; J. M. Law
; | Date: |
1 Oct 2013 | Abstract: | Field-induced magnetic ordering in the Haldane chain compound
SrNi$_{2}$V$_{2}$O$_{8}$ and effect of anisotropy have been investigated using
single crystals. Static susceptibility, inelastic neutron scattering,
high-field magnetization, and low temperature heat-capacity studies confirm a
non-magnetic spin-singlet ground state and a gap between the singlet ground
state and triplet excited states. The intra-chain exchange interaction is
estimated to be $J sim 8.9{pm}$0.1 meV. Splitting of the dispersions into two
modes with minimum energies 1.57 and 2.58 meV confirms the existence of
single-ion anisotropy $D(S^z){^2}$. The value of {it D} is estimated to be
$-0.51{pm}0.01$ meV and the easy axis is found to be along the
crystallographic {it c}-axis. Field-induced magnetic ordering has been found
with two critical fields [$mu_0H_c^{perp c} = 12.0{pm}$0.2 T and
$mu_0H_c^{parallel c} = 20.8{pm}$0.5 T at 4.2 K]. Field-induced
three-dimensional magnetic ordering above the critical fields is evident from
the heat-capacity, susceptibility, and high-field magnetization study. The
Phase diagram in the {it H-T} plane has been obtained from the high-field
magnetization. The observed results are discussed in the light of theoretical
predictions as well as earlier experimental reports on Haldane chain compounds. | Source: | arXiv, 1310.0221 | Services: | Forum | Review | PDF | Favorites |
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