Spin chirality and polarised neutron scattering
UNSPECIFIED (2001) Spin chirality and polarised neutron scattering. In: 3rd Workshop on Polarized Neutrons for Condensed Mater Investigation (PNCMI 2000), JUN 20-25, 2000, PETERSBURG NUCL PHYS INST, GATCHINA, GERMANY.Full text not available from this repository.
Possibilities of polarised neutrons in studies of chiral criticality are discussed. The critical exponents beta (C),. of the average chirality below T-N, as well as phi (C) = beta (C) + gamma (C) and, therefore, gamma (C) of the chiral susceptibility above T-N are determined for a XY triangular lattice antiferromagnet (TLA) CsMnBr3: beta (C) = 0.44(2), gamma (C) = 0.84(7). The critical behaviour of the chirality that orders at T, with a relative precision of 5 x 10(-4) proves that the phase transition belongs to a new chiral universality class. For the TLA CsNiCl3 (S = 1) we found in the XY region (B = 3 T) phi (C) = 1.24(7) in agreement with the Monte-Carlo value phi (C) = 1.22(6) for the chiral universality class. In the easy-axis region at B = 1 T, phi (C) = 0.54(4), and the Haldane excitations are observed in the polarisation-dependent inelastic cross section above T,. The helimagnet holmium exhibits a different chiral criticality with phi (C) = 1.56(5), essentially higher than for TLAs. (C) 2001 Elsevier Science B.V. All rights reserved.
|Item Type:||Conference Item (UNSPECIFIED)|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||PHYSICA B-CONDENSED MATTER|
|Publisher:||ELSEVIER SCIENCE BV|
|Number of Pages:||7|
|Page Range:||pp. 60-66|
|Title of Event:||3rd Workshop on Polarized Neutrons for Condensed Mater Investigation (PNCMI 2000)|
|Location of Event:||PETERSBURG NUCL PHYS INST, GATCHINA, GERMANY|
|Date(s) of Event:||JUN 20-25, 2000|
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