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arXiv · 1001.2142

Observations of Pauli Paramagnetic Effects on the Flux Line Lattice in CeCoIn5

J. S. White·P. Das·M. R. Eskildsen·L. DeBeer-Schmitt·E. M. Forgan·A. D. Bianchi·M. Kenzelmann·M. Zolliker·S. Gerber·J. L. Gavilano·J. Mesot·R. Movshovich·E. D. Bauer·J. L. Sarrao·C. Petrovic
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Abstract

From small-angle neutron scattering studies of the flux line lattice (FLL) in CeCoIn5, with magnetic field applied parallel to the crystal c-axis, we obtain the field- and temperature-dependence of the FLL form factor, which is a measure of the spatial variation of the field in the mixed state. We extend our earlier work [A.D. Bianchi et al. 2008 Science 319, 177] to temperatures up to 1250 mK. Over the entire temperature range, paramagnetism in the flux line cores results in an increase of the form factor with field. Near H_c2 the form factor decreases again, and our results indicate that this fall-off extends outside the proposed FFLO region. Instead, we attribute the decrease to a paramagnetic suppression of Cooper pairing. At higher temperatures, a gradual crossover towards more conventional mixed state behavior is observed.

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J. S. White, P. Das, M. R. Eskildsen, L. DeBeer-Schmitt, E. M. Forgan, A. D. Bianchi, M. Kenzelmann, M. Zolliker, S. Gerber, J. L. Gavilano, J. Mesot, R. Movshovich, E. D. Bauer, J. L. Sarrao, C. Petrovic. 2010-01-13. Observations of Pauli Paramagnetic Effects on the Flux Line Lattice in CeCoIn5. https://doi.org/10.1088/1367-2630%2F12%2F2%2F023026

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