Dichotomy between the Hole and Electron Behavior in Multiband Superconductor FeSe Probed by Ultrahigh Magnetic Fields

被引：122

作者：

Watson, M. D. ^{[2
]}

Yamashita, T. ^{[1
]}

Kasahara, S. ^{[1
]}

Knafo, W. ^{[3
]}

Nardone, M. ^{[3
]}

Beard, J. ^{[3
]}

Hardy, F. ^{[4
]}

McCollam, A. ^{[5
]}

Narayanan, A.

Blake, S. F. ^{[2
]}

Wolf, T. ^{[4
]}

Haghighirad, A. A. ^{[2
]}

Meingast, C. ^{[4
]}

Schofield, A. J. ^{[6
]}

Loehneysen, H. v. ^{[4
]}

Matsuda, Y. ^{[1
]}

Coldea, A. I. ^{[2
]}

Shibauchi, T. ^{[1
,7
]}

机构：

[1] Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068501, Japan

[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[3] CNRS UJF UPS INSA, UPR 3228, Lab Natl Champs Magnet Intenses LNCMI EMFL, F-31400 Toulouse, France

[4] Karlsruhe Inst Technol, Inst Festkorperphys, D-76021 Karlsruhe, Germany

[5] Radboud Univ Nijmegen, High Field Magnet Lab HFML EMFL, NL-6525 ED Nijmegen, Netherlands

[6] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[7] Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba 2778561, Japan

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 02期

基金：

美国国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

QUANTUM OSCILLATIONS;

D O I：

10.1103/PhysRevLett.115.027006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magnetoresistivity rho(xx) and Hall resistivity rho(xy) in ultrahigh magnetic fields up to 88 Tare measured down to 0.15 K to clarify the multiband electronic structure in high-quality single crystals of superconducting FeSe. At low temperatures and high fields we observe quantum oscillations in both resistivity and the Hall effect, confirming the multiband Fermi surface with small volumes. We propose a novel approach to identify from magnetotransport measurements the sign of the charge carriers corresponding to a particular cyclotron orbit in a compensated metal. The observed significant differences in the relative amplitudes of the quantum oscillations between the rho(xx) and rho(xy) components, together with the positive sign of the high-field rho(xy), reveal that the largest pocket should correspond to the hole band. The low-field magnetotransport data in the normal state suggest that, in addition to one hole and one almost compensated electron band, the orthorhombic phase of FeSe exhibits an additional tiny electron pocket with a high mobility.

引用

页数：6

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