Field dependence of the superconducting basal plane anisotropy of TmNi2B2C
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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Abstract
The superconductor TmNi2B2C possesses a significant fourfold basal plane anisotropy, leading to a square vortex lattice (VL) at intermediate fields. However, unlike other members of the borocarbide superconductors, the anisotropy in TmNi2B2C appears to decrease with increasing field, evident by a reentrance of the square VL phase. We have used small-angle neutron scattering measurements of the VL to study the field dependence of the anisotropy. Our results provide a direct, quantitative measurement of the decreasing anisotropy. We attribute this reduction of the basal plane anisotropy to the strong Pauli paramagnetic effects observed in TmNi2B2C and the resulting expansion of vortex cores near Hc2.
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This article is published as Das, P., J. M. Densmore, C. Rastovski, K. J. Schlesinger, Mark Laver, C. D. Dewhurst, K. Littrell, Serguei L. Bud'ko, Paul C. Canfield, and M. R. Eskildsen. "Field dependence of the superconducting basal plane anisotropy of TmNi 2 B 2 C." Physical Review B 86, no. 14 (2012): 144501. DOI: 10.1103/PhysRevB.86.144501.