UNSPECIFIED (2005) Vortex-lattice symmetry near T-c in YNi2B2C. PHYSICAL REVIEW B, 72 (1). -. doi:10.1103/PhysRevB.72.014542 ISSN 1098-0121.

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Abstract

Detailed high-resolution small-angle neutron diffraction measurements have been used to determine the structural phase diagram of the vortex lattice (VL) in YNi2B2C with H parallel to c. At low temperatures (T < T-c) the first-order 45 degrees reorientation transition at a field H-1(T) and second-order rhombic to square transition, H-2(T) have previously been described by the effects of Fermi surface (FS) anisotropy and nonlocality. H-1(T) decreases while H-2(T) increases with increasing temperature. Measurements of the VL structure as close to the upper critical field T-c2(H) as is currently experimentally feasible show no evidence of significant upward curvature or reentrance of H-2 that is expected when thermal fluctuations suppress nonlocality. For fields H-1(T)< H < H-2(T) the VL remains rhombic and shows no sign of becoming hexagonal close to T-c2(H). Our data suggest that an underlying electronic asymmetry, other than FS and nonlocal effects and likely due to an anisotropic superconducting gap, controls the VL structure close to T-c2(H).

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PHYSICAL REVIEW B
Publisher:	AMERICAN PHYSICAL SOC
ISSN:	1098-0121
Official Date:	July 2005
Dates:	Date Event July 2005 UNSPECIFIED
Volume:	72
Number:	1
Number of Pages:	5
Page Range:	-
DOI:	10.1103/PhysRevB.72.014542
Publication Status:	Published

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