Interplanar coupling-dependent magnetoresistivity in high-purity layered metals

被引：47

作者：

Kikugawa, N. ^{[1
,2
]}

Goswami, P. ^{[2
,3
]}

Kiswandhi, A. ^{[2
,10
]}

Choi, E. S. ^{[2
]}

Graf, D. ^{[2
]}

Baumbach, R. E. ^{[2
]}

Brooks, J. S. ^{[2
]}

Sugii, K. ^{[1
,11
]}

Iida, Y. ^{[1
]}

Nishio, M. ^{[4
]}

Uji, S. ^{[1
]}

Terashima, T. ^{[1
]}

Rourke, P. M. C. ^{[5
,13
]}

Hussey, N. E. ^{[6
,7
]}

Takatsu, H. ^{[8
,9
,12
]}

Yonezawa, S. ^{[9
]}

Maeno, Y. ^{[9
]}

Balicas, L. ^{[2
]}

机构：

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

[2] Florida State Univ, Condensed Matter Grp, Natl High Magnet Field Lab, 1800 East Paul Dirac Dr, Tallahassee, FL 32310 USA

[3] Univ Maryland, Condensed Matter Theory Ctr, College Pk, MD 20742 USA

[4] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[5] Univ Bristol, HH Wills Phys Lab, Tyndall Ave, Bristol BS8 1TL, Avon, England

[6] Radboud Univ Nijmegen, High Field Magnet Lab HFML EMFL, Toernooiveld 7, Nijmegen, Netherlands

[7] Radboud Univ Nijmegen, Inst Mol & Mat, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands

[8] Tokyo Metropolitan Univ, Dept Phys, Tokyo 1920397, Japan

[9] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan

[10] Univ Texas Dallas, Dept Phys, Richardson, TX 75080 USA

[11] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[12] Kyoto Univ, Grad Sch Engn, Dept Energy & Hydrocarbon Chem, Kyoto 6158510, Japan

[13] CNR, Ottawa, ON K1A 0R6, Canada

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

关键词：

TOPOLOGICAL DIRAC SEMIMETAL; OSCILLATORY MAGNETORESISTANCE; WEYL; MOBILITY; PHASE;

D O I：

10.1038/ncomms10903

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The magnetic field-induced changes in the conductivity of metals are the subject of intense interest, both for revealing new phenomena and as a valuable tool for determining their Fermi surface. Here we report a hitherto unobserved magnetoresistive effect in ultra-clean layered metals, namely a negative longitudinal magnetoresistance that is capable of overcoming their very pronounced orbital one. This effect is correlated with the interlayer coupling disappearing for fields applied along the so-called Yamaji angles where the interlayer coupling vanishes. Therefore, it is intrinsically associated with the Fermi points in the field-induced quasi-one-dimensional electronic dispersion, implying that it results from the axial anomaly among these Fermi points. In its original formulation, the anomaly is predicted to violate separate number conservation laws for left-and right-handed chiral (for example, Weyl) fermions. Its observation in PdCoO2, PtCoO2 and Sr2RuO4 suggests that the anomaly affects the transport of clean conductors, in particular near the quantum limit.

引用

页数：8

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