Upper and lower critical magnetic fields of superconducting NdFeAsO 1-xFx single crystals studied by Hall-probe magnetization and specific heat

Z. Pribulova; T. Klein; J. Kacmarcik; C. Marcenat; M. Konczykowski; S. L. Bud'ko; M. Tillman; P. C. Canfield

doi:10.1103/PhysRevB.79.020508

Upper and lower critical magnetic fields of superconducting NdFeAsO _1-xF_x single crystals studied by Hall-probe magnetization and specific heat

Z. Pribulova
, T. Klein
, J. Kacmarcik
, C. Marcenat
, M. Konczykowski
, S. L. Bud'ko
, M. Tillman
, P. C. Canfield

École Polytechnique

Research output: Contribution to journal › Article › peer-review

Abstract

The upper and lower critical fields have been deduced from specific heat and Hall-probe magnetization measurements in nonoptimally doped Nd(O,F)FeAs single crystals (T_c∼32-35-K). The anisotropy of the penetration depth (Γ_λ) is temperature independent and on the order of 4.0±1.5. Similarly specific-heat data lead to an anisotropy of the coherence length Γ_ξ∼5.5±1.5 close to T _c. Our results suggest the presence of rather large thermal fluctuations and the existence of a vortex liquid phase over a broad temperature range (∼5 K large at 2 T).

Original language	English
Article number	020508
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	79
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.79.020508
Publication status	Published - 5 Jan 2009

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Pribulova, Z., Klein, T., Kacmarcik, J., Marcenat, C., Konczykowski, M., Bud'ko, S. L., Tillman, M., & Canfield, P. C. (2009). Upper and lower critical magnetic fields of superconducting NdFeAsO _1-xF_x single crystals studied by Hall-probe magnetization and specific heat. Physical Review B - Condensed Matter and Materials Physics, 79(2), Article 020508. https://doi.org/10.1103/PhysRevB.79.020508

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title = "Upper and lower critical magnetic fields of superconducting NdFeAsO 1-xFx single crystals studied by Hall-probe magnetization and specific heat",

abstract = "The upper and lower critical fields have been deduced from specific heat and Hall-probe magnetization measurements in nonoptimally doped Nd(O,F)FeAs single crystals (Tc∼32-35-K). The anisotropy of the penetration depth (Γλ) is temperature independent and on the order of 4.0±1.5. Similarly specific-heat data lead to an anisotropy of the coherence length Γξ∼5.5±1.5 close to T c. Our results suggest the presence of rather large thermal fluctuations and the existence of a vortex liquid phase over a broad temperature range (∼5 K large at 2 T).",

author = "Z. Pribulova and T. Klein and J. Kacmarcik and C. Marcenat and M. Konczykowski and Bud'ko, \{S. L.\} and M. Tillman and Canfield, \{P. C.\}",

year = "2009",

month = jan,

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doi = "10.1103/PhysRevB.79.020508",

language = "English",

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Pribulova, Z, Klein, T, Kacmarcik, J, Marcenat, C, Konczykowski, M, Bud'ko, SL, Tillman, M & Canfield, PC 2009, 'Upper and lower critical magnetic fields of superconducting NdFeAsO _1-xF_x single crystals studied by Hall-probe magnetization and specific heat', Physical Review B - Condensed Matter and Materials Physics, vol. 79, no. 2, 020508. https://doi.org/10.1103/PhysRevB.79.020508

TY - JOUR

T1 - Upper and lower critical magnetic fields of superconducting NdFeAsO 1-xFx single crystals studied by Hall-probe magnetization and specific heat

AU - Pribulova, Z.

AU - Klein, T.

AU - Kacmarcik, J.

AU - Marcenat, C.

AU - Konczykowski, M.

AU - Bud'ko, S. L.

AU - Tillman, M.

AU - Canfield, P. C.

PY - 2009/1/5

Y1 - 2009/1/5

N2 - The upper and lower critical fields have been deduced from specific heat and Hall-probe magnetization measurements in nonoptimally doped Nd(O,F)FeAs single crystals (Tc∼32-35-K). The anisotropy of the penetration depth (Γλ) is temperature independent and on the order of 4.0±1.5. Similarly specific-heat data lead to an anisotropy of the coherence length Γξ∼5.5±1.5 close to T c. Our results suggest the presence of rather large thermal fluctuations and the existence of a vortex liquid phase over a broad temperature range (∼5 K large at 2 T).

AB - The upper and lower critical fields have been deduced from specific heat and Hall-probe magnetization measurements in nonoptimally doped Nd(O,F)FeAs single crystals (Tc∼32-35-K). The anisotropy of the penetration depth (Γλ) is temperature independent and on the order of 4.0±1.5. Similarly specific-heat data lead to an anisotropy of the coherence length Γξ∼5.5±1.5 close to T c. Our results suggest the presence of rather large thermal fluctuations and the existence of a vortex liquid phase over a broad temperature range (∼5 K large at 2 T).

UR - https://www.scopus.com/pages/publications/60349125333

U2 - 10.1103/PhysRevB.79.020508

DO - 10.1103/PhysRevB.79.020508

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AN - SCOPUS:60349125333

SN - 1098-0121

VL - 79

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 2

M1 - 020508

ER -

Upper and lower critical magnetic fields of superconducting NdFeAsO _1-xF_x single crystals studied by Hall-probe magnetization and specific heat

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