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Phys. Rev. Lett. 99, 167001 (2007) [4 pages]

Pauli Paramagnetic Effects on Vortices in Superconducting TmNi2B2C

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L. DeBeer-Schmitt1, M. R. Eskildsen1,*, M. Ichioka2, K. Machida2, N. Jenkins3, C. D. Dewhurst4, A. B. Abrahamsen5, S. L. Bud’ko6, and P. C. Canfield6
1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
2Department of Physics, Okayama University, Okayama 700-8530, Japan
3DPMC, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland
4Institut Laue-Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, France
5Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
6Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Received 4 April 2007; published 16 October 2007

The magnetic field distribution around the vortices in TmNi2B2C in the paramagnetic phase was studied experimentally as well as theoretically. The vortex form factor, measured by small-angle neutron scattering, is found to be field independent up to 0.6Hc2 followed by a sharp decrease at higher fields. The data are fitted well by solutions to the Eilenberger equations when paramagnetic effects due to the exchange interaction with the localized 4f Tm moments are included. The induced paramagnetic moments around the vortex cores act to maintain the field contrast probed by the form factor.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.167001
DOI:
10.1103/PhysRevLett.99.167001
PACS:
74.25.Op, 61.12.Ex, 74.25.Ha, 74.70.Dd

*eskildsen@nd.edu

 
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