Resistivity and Upper Critical Field in KFe2As2 Single Crystals

被引：82

作者：

Terashima, Taichi ^{[1
,3
]}

Kimata, Motoi ^{[1
]}

Satsukawa, Hidetaka ^{[1
]}

Harada, Atsushi ^{[1
]}

Hazama, Kaori ^{[1
]}

Uji, Shinya ^{[1
,3
]}

Harima, Hisatomo ^{[2
,3
]}

Chen, Gen-Fu ^{[4
]}

Luo, Jian-Lin ^{[4
]}

Wang, Nan-Lin ^{[4
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050003, Japan

[2] Kobe Univ, Dept Phys, Grad Sch Sci, Kobe, Hyogo 6578501, Japan

[3] JST, TRIP, Chiyoda Ku, Tokyo 1020075, Japan

[4] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 06期

关键词：

iron pnictide superconductor; resistivity; upper critical field; anisotropy; SUPERCONDUCTIVITY; TEMPERATURE; SPIN;

D O I：

10.1143/JPSJ.78.063702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report resistivity measurements performed on KFe2As2 single crystals down to T = 0.3 K and in magnetic fields up to 17.5T. The in-plane resistivity vs T curve has a convex shape down to similar to 50 K and shows a T-2 dependence below similar to 45 K. The ratio of the c-axis to in-plane resistivities is similar to 10 at room temperature and similar to 40 at 4.2 K. The superconducting upper critical field B-c2(T) has been determined from the resistivity data: B-c2(ab)(0) = 4.47T and B-c2(c)(0) = 1.25 T. The anisotropy parameter Gamma = B-c2(ab)/B-c2(c) increases with T and is 6.8 at T = T-c. The strong curvature of the B-c2(ab)(T) curve indicates the existence of strong spin paramagnetic effects.

引用

页数：4

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