Field dependence of the superconducting basal plane anisotropy of TmNi 2B 2C

P. Das; J. M. Densmore; C. Rastovski; K. J. Schlesinger; M. Laver; C. D. Dewhurst; K. Littrell; S. L. Bud'Ko; P. C. Canfield; M. R. Eskildsen

doi:10.1103/PhysRevB.86.144501

Field dependence of the superconducting basal plane anisotropy of TmNi ₂B ₂C

P. Das, J. M. Densmore, C. Rastovski, K. J. Schlesinger, M. Laver, C. D. Dewhurst, K. Littrell, S. L. Bud'Ko, P. C. Canfield, M. R. Eskildsen

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Abstract

The superconductor TmNi ₂B ₂C 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 TmNi ₂B ₂C 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 TmNi ₂B ₂C and the resulting expansion of vortex cores near H _c2.

Original language	English
Article number	144501
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.86.144501
State	Published - Oct 1 2012

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title = "Field dependence of the superconducting basal plane anisotropy of TmNi 2B 2C",

abstract = "The superconductor TmNi 2B 2C 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 TmNi 2B 2C 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 TmNi 2B 2C and the resulting expansion of vortex cores near H c2.",

author = "P. Das and Densmore, {J. M.} and C. Rastovski and Schlesinger, {K. J.} and M. Laver and Dewhurst, {C. D.} and K. Littrell and Bud'Ko, {S. L.} and Canfield, {P. C.} and Eskildsen, {M. R.}",

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doi = "10.1103/PhysRevB.86.144501",

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T1 - Field dependence of the superconducting basal plane anisotropy of TmNi 2B 2C

AU - Das, P.

AU - Densmore, J. M.

AU - Rastovski, C.

AU - Schlesinger, K. J.

AU - Laver, M.

AU - Dewhurst, C. D.

AU - Littrell, K.

AU - Bud'Ko, S. L.

AU - Canfield, P. C.

AU - Eskildsen, M. R.

PY - 2012/10/1

Y1 - 2012/10/1

N2 - The superconductor TmNi 2B 2C 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 TmNi 2B 2C 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 TmNi 2B 2C and the resulting expansion of vortex cores near H c2.

AB - The superconductor TmNi 2B 2C 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 TmNi 2B 2C 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 TmNi 2B 2C and the resulting expansion of vortex cores near H c2.

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U2 - 10.1103/PhysRevB.86.144501

DO - 10.1103/PhysRevB.86.144501

M3 - Article

AN - SCOPUS:84867071351

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VL - 86

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 14

M1 - 144501

ER -

Field dependence of the superconducting basal plane anisotropy of TmNi ₂B ₂C

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