Suppression of magnetic excitations near the surface of the topological Kondo insulator SmB6

被引：20

作者：

Biswas, P. K. ^{[1
,2
]}

Legner, M. ^{[3
]}

Balakrishnan, G. ^{[4
]}

Hatnean, M. Ciomaga ^{[4
]}

Lees, M. R. ^{[4
]}

Paul, D. Mck. ^{[4
]}

Pomjakushina, E. ^{[5
]}

Prokscha, T. ^{[1
]}

Suter, A. ^{[1
]}

Neupert, T. ^{[6
]}

Salman, Z. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

[2] STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Harwell Campus, Didcot OX11 0QX, Oxon, England

[3] ETH, Inst Theoret Phys, CH-8093 Zurich, Switzerland

[4] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[5] Paul Scherrer Inst, Lab Sci Dev & Novel Mat, CH-5232 Villigen, Switzerland

[6] Univ Zurich, Inst Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

GENERATION; RELAXATION; STATES;

D O I：

10.1103/PhysRevB.95.020410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a detailed investigation of the temperature and depth dependence of the magnetic properties of the three-dimensional topological Kondo insulator SmB6, in particular, near its surface. We find that local magnetic field fluctuations detected in the bulk are suppressed rapidly with decreasing depths, disappearing almost completely at the surface. We attribute the magnetic excitations to spin excitons in bulk SmB6, which produce local magnetic fields of about similar to 1.8 mT fluctuating on a time scale of similar to 60 ns. We find that the excitonic fluctuations are suppressed when approaching the surface on a length scale of similar to 40-90 nm, accompanied by a small enhancement in static magnetic fields. We associate this length scale to the size of the excitonic state.

引用

页数：5

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