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Vortex lattice studies in CeCoIn5 with H perpendicular to c

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arxiv 1201.1880 v1 pith:Z6DSPRG3 submitted 2012-01-09 cond-mat.supr-con cond-mat.str-el

Vortex lattice studies in CeCoIn5 with H perpendicular to c

P. Das , J. S. White , A. T. Holmes , S. Gerber , E. M. Forgan , A. D. Bianchi , M. Kenzelmann , M. Zolliker
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J. L. Gavilano E. D. Bauer J. L. Sarrao C. Petrovic M. R. Eskildsen
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classification cond-mat.supr-con cond-mat.str-el
keywords cecoin5fieldfieldslatticeobservedstudiestransitionvortex
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We present small angle neutron scattering studies of the vortex lattice (VL) in CeCoIn5 with magnetic fields applied parallel (H) to the antinodal [100] and nodal [110] directions. For H || [100], a single VL orientation is observed, while a 90 degree reorientation transition is found for H || [110]. For both field orientations and VL configurations we find a distorted hexagonal VL with an anisotropy, Gamma = 2.0 +/- 0.05. The VL form factor shows strong Pauli paramagnetic effects similar to what have previously been reported for H || [001]. At high fields, above which the upper critical field (Hc2) becomes a first-order transition, an increased disordering of the VL is observed.

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