Resistivity and upper critical field in KFe 2As 2 single crystals

Taichi Terashima; Motoi Kimata; Hidetaka Satsukawa; Atsushi Harada; Kaori Hazama; Shinya Uji; Hisatomo Harima; Gen Fu Chen; Jian Lin Luo; Nan Lin Wang

doi:10.1143/JPSJ.78.063702

Resistivity and upper critical field in KFe ₂As ₂ single crystals

Taichi Terashima, Motoi Kimata, Hidetaka Satsukawa, Atsushi Harada, Kaori Hazama, Shinya Uji, Hisatomo Harima, Gen Fu Chen, Jian Lin Luo, Nan Lin Wang

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

83 Citations (Scopus)

Abstract

We report resistivity measurements performed on KFe ₂As ₂ single crystals down to T = 0:3K and in magnetic fields up to 17.5 T. The in-plane resistivity vs T curve has a convex shape down to ∼50K and shows a T ² dependence below ∼45 K. The ratio of the c-axis to in-plane resistivities is ∼10 at room temperature and ∼40 at 4.2 K. The superconducting upper critical field B ^ab _c2(T) has been determined from the resistivity data: B ^ab _c2(0) = 4:47T and B ^c _c2(0) = 1:25 T. The anisotropy parameter T = B ^ab _c2/B ^c _c2 increases with T and is 6.8 at T = Tc. The strong curvature of the B ^ab _c2(T) curve indicates the existence of strong spin paramagnetic effects.

Original language	English
Article number	063702
Journal	journal of the physical society of japan
Volume	78
Issue number	6
DOIs	https://doi.org/10.1143/JPSJ.78.063702
Publication status	Published - 2009 Jun
Externally published	Yes

Keywords

Anisotropy
Iron pnictide superconductor
Resistivity
Upper critical field

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.78.063702

Cite this

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title = "Resistivity and upper critical field in KFe 2As 2 single crystals",

abstract = "We report resistivity measurements performed on KFe 2As 2 single crystals down to T = 0:3K and in magnetic fields up to 17.5 T. The in-plane resistivity vs T curve has a convex shape down to ∼50K and shows a T 2 dependence below ∼45 K. The ratio of the c-axis to in-plane resistivities is ∼10 at room temperature and ∼40 at 4.2 K. The superconducting upper critical field B ab c2(T) has been determined from the resistivity data: B ab c2(0) = 4:47T and B c c2(0) = 1:25 T. The anisotropy parameter T = B ab c2/B c c2 increases with T and is 6.8 at T = Tc. The strong curvature of the B ab c2(T) curve indicates the existence of strong spin paramagnetic effects.",

keywords = "Anisotropy, Iron pnictide superconductor, Resistivity, Upper critical field",

author = "Taichi Terashima and Motoi Kimata and Hidetaka Satsukawa and Atsushi Harada and Kaori Hazama and Shinya Uji and Hisatomo Harima and Chen, {Gen Fu} and Luo, {Jian Lin} and Wang, {Nan Lin}",

year = "2009",

month = jun,

doi = "10.1143/JPSJ.78.063702",

language = "English",

volume = "78",

journal = "Journal of the Physical Society of Japan",

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publisher = "Physical Society of Japan",

number = "6",

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T1 - Resistivity and upper critical field in KFe 2As 2 single crystals

AU - Terashima, Taichi

AU - Kimata, Motoi

AU - Satsukawa, Hidetaka

AU - Harada, Atsushi

AU - Hazama, Kaori

AU - Uji, Shinya

AU - Harima, Hisatomo

AU - Chen, Gen Fu

AU - Luo, Jian Lin

AU - Wang, Nan Lin

PY - 2009/6

Y1 - 2009/6

N2 - We report resistivity measurements performed on KFe 2As 2 single crystals down to T = 0:3K and in magnetic fields up to 17.5 T. The in-plane resistivity vs T curve has a convex shape down to ∼50K and shows a T 2 dependence below ∼45 K. The ratio of the c-axis to in-plane resistivities is ∼10 at room temperature and ∼40 at 4.2 K. The superconducting upper critical field B ab c2(T) has been determined from the resistivity data: B ab c2(0) = 4:47T and B c c2(0) = 1:25 T. The anisotropy parameter T = B ab c2/B c c2 increases with T and is 6.8 at T = Tc. The strong curvature of the B ab c2(T) curve indicates the existence of strong spin paramagnetic effects.

AB - We report resistivity measurements performed on KFe 2As 2 single crystals down to T = 0:3K and in magnetic fields up to 17.5 T. The in-plane resistivity vs T curve has a convex shape down to ∼50K and shows a T 2 dependence below ∼45 K. The ratio of the c-axis to in-plane resistivities is ∼10 at room temperature and ∼40 at 4.2 K. The superconducting upper critical field B ab c2(T) has been determined from the resistivity data: B ab c2(0) = 4:47T and B c c2(0) = 1:25 T. The anisotropy parameter T = B ab c2/B c c2 increases with T and is 6.8 at T = Tc. The strong curvature of the B ab c2(T) curve indicates the existence of strong spin paramagnetic effects.

KW - Anisotropy

KW - Iron pnictide superconductor

KW - Resistivity

KW - Upper critical field

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