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Article overview
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Criticality in a disordered quantum antiferromagnet by neutron diffraction | E.Wulf
; D.Huvonen
; J.-W.Kim
; A.Paduan-Filho
; E.Ressouche
; S.Gvasaliya
; V.Zapf
; A.Zheludev
; | Date: |
3 Oct 2013 | Abstract: | Field-induced magnetic ordering in the structurally disordered quantum
magnets Ni(Cl$_{1-x}$Br$_x$)$_2$$cdot$4SC(NH$_2$)$_2$, $x=8$% and 13%, is
studied by means of neutron diffraction. The order parameter critical exponent
is found to be very close to its value $eta=0.5$ expected for magnetic
Bose-Einstein condensation in the absence of disorder. This result applies to
temperatures down to 40 mK, and a 1 T range in magnetic field. The crossover
exponent is found to be $phi sim 0.4$, for temperature ranges as small as 300
mK. Possible reasons for a discrepancy with recent numerical simulations and
bulk measurements are discussed. | Source: | arXiv, 1310.1023 | Services: | Forum | Review | PDF | Favorites |
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