Upper critical field and quantum oscillations in tetragonal superconducting FeS

被引：14

作者：

Terashima, Taichi ^{[1
]}

Kikugawa, Naoki ^{[1
]}

Lin, Hai ^{[2
,3
]}

Zhu, Xiyu ^{[2
,3
]}

Wen, Hai-Hu ^{[2
,3
]}

Nomoto, Takuya ^{[4
]}

Suzuki, Katsuhiro ^{[5
]}

Ikeda, Hiroaki ^{[6
]}

Uji, Shinya ^{[1
]}

机构：

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

[2] Nanjing Univ, Ctr Superconducting Phys & Mat, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[3] Nanjing Univ, Dept Phys, Natl Ctr Microstruct & Quantum Manipulat, Nanjing 210093, Jiangsu, Peoples R China

[4] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[5] Ritsumeikan Univ, Res Org Sci & Technol, Kusatsu, Shiga 5258577, Japan

[6] Ritsumeikan Univ, Dept Phys, Kusatsu, Shiga 5258577, Japan

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 10期

基金：

中国国家自然科学基金;

关键词：

PHASE;

D O I：

10.1103/PhysRevB.94.100503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetoresistance and magnetic torque of FeS are measured in magnetic fields B of up to 18 T down to a temperature of 0.03 K. The superconducting transition temperature is found to be T-c = 4.1 K, and the anisotropy ratio of the upper critical field B-c2 at Tc is estimated from the initial slopes to be Gamma (T-c) = 6.9. B-c2(0) is estimated to be 2.2 and 0.36 T for B parallel to ab and c, respectively. Quantum oscillations are observed in both the resistance and torque. Two frequencies F = 0.15 and 0.20 kT are resolved and assigned to a quasi-two-dimensional Fermi surface cylinder. The carrier density and Sommerfeld coefficient associated with this cylinder are estimated to be 5.8 x 10(-3) carriers/Fe and 0.48 mJ/(K-2 mol), respectively. Other Fermi surface pockets still remain to be found. Band-structure calculations are performed and compared to the experimental results.

引用

页数：6

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