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Phys. Rev. B 73, 020504(R) (2006) [4 pages]

Phonon-induced quadrupolar ordering of the magnetic superconductor TmNi2B2C

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N. H. Andersen1, J. Jensen2, T. B. S. Jensen1, M. v. Zimmermann3, R. Pinholt1, A. B. Abrahamsen1, K. Nørgaard Toft1, P. Hedegård2, and P. C. Canfield4
1Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
2Niels Bohr Institute, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
3Hamburger Synchrotronstrahlungslabor at Deutsches Elektronen Synchrotron, Notkestrasse 85, 22603 Hamburg, Germany
4Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Received 26 August 2005; published 31 January 2006

We present synchrotron x-ray diffraction studies revealing that the lattice of thulium borocarbide is distorted below TQ≃13.5 K at zero field. TQ increases and the amplitude of the displacements is drastically enhanced by a factor of 10 at 60 kOe when a magnetic field is applied along [100]. The distortion occurs at the same wave vector as the antiferromagnetic ordering induced by the a-axis field. A model is presented that accounts for the properties of the quadrupolar phase and explains the peculiar behavior of the antiferromagnetic ordering previously observed in this compound.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.73.020504
DOI:
10.1103/PhysRevB.73.020504
PACS:
74.70.Dd, 75.25.+z, 75.80.+q
 
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