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Phys. Rev. B 64, 100402(R) (2001) [4 pages]

Chiral criticality in helimagnet Ho studied by polarized neutron scattering

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V. P. Plakhty1,2, W. Schweika2, Th. Brückel2, J. Kulda3, S. V. Gavrilov1, L.-P. Regnault4, and D. Visser5
1Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg 188300, Russia
2Institut für Streumethoden, IFF, Forschungszentrum Jülich, D-52425 Jülich, Germany
3Institut Laue-Langevin, Boîte Postale 156, 38042 Grenoble Cedex 9, France
4CEA-Grenoble, DRFMC/SPSMS/MDN, rue des Martyrs, 38054 Grenoble Cedex 9, France
5CLRC, ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom

Received 19 April 2001; published 8 August 2001

The critical exponents for the average chirality, βc=0.90(3), and the chiral susceptibility, γc=0.68(6), are determined for the spin-ordering transition in helimagnet Ho. The βc is extraordinarily large and twice higher than the predicted value for the chiral universality class, while the γc is in agreement with this scenario. The staggered magnetization critical exponent is determined to be β=0.38(1). The difference βc-2β=0.137(36) suggests that chirality is a component of the order parameter independent of the staggered magnetization. The chiral-ordering transition and the Néel temperature coincide with a relative precision of 10-4.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.100402
DOI:
10.1103/PhysRevB.64.100402
PACS:
75.25.+z, 75.40.Cx, 75.50.Ee
 
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