Pauli paramagnetic effects on vortices in superconducting TmNi2B2C

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2007-10-19
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DeBeer-Schmitt, L.
Eskildsen, M. R.
Ichioka, M.
Machida, K.
Jenkins, N.
Dewhurst, C. D.
Abrahamsen, A. B.
Bud'ko, Sergey L.
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American Physical Society
Abstract
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 0.6H(c2) 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.
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This article is published as DeBeer-Schmitt, L., Morten Ring Eskildsen, M. Ichioka, K. Machida, N. Jenkins, C. D. Dewhurst, Asger Bech Abrahamsen, S. L. Bud’ko, and P. C. Canfield. "Pauli paramagnetic effects on vortices in superconducting TmNi 2 B 2 C." Physical Review Letters 99, no. 16 (2007): 167001. DOI: 10.1103/PhysRevLett.99.167001. Copyright 2007 American Physical Society. Posted with permission.
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