Competing Exchange Interactions on the Verge of a Metal-Insulator Transition in the Two-Dimensional Spiral Magnet Sr3Fe2O7

被引：40

作者：

Kim, J. -H. ^{[1
]}

Jain, Anil ^{[1
,2
]}

Reehuis, M. ^{[3
]}

Khaliullin, G. ^{[1
]}

Peets, D. C. ^{[1
]}

Ulrich, C. ^{[1
,4
,5
]}

Park, J. T. ^{[6
]}

Faulhaber, E. ^{[6
]}

Hoser, A. ^{[3
]}

Walker, H. C. ^{[7
]}

Adroja, D. T. ^{[7
,8
]}

Walters, A. C. ^{[1
]}

Inosov, D. S. ^{[1
,9
]}

Maljuk, A. ^{[1
,10
]}

Keimer, B. ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India

[3] Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany

[4] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

[5] Australian Nucl Sci & Technol Org, Lucas Heights, NSW 2234, Australia

[6] Forsch Neutronenquelle Heinz Maier Leibnitz FRM I, D-85748 Garching, Germany

[7] Rutherford Appleton Lab, ISIS Facil, STFC, Didcot OX11 0QX, Oxon, England

[8] Univ Johannesburg, Dept Phys, Highly Correlated Matter Res Grp, ZA-2006 Auckland Pk, South Africa

[9] Tech Univ Dresden, Inst Festkorperphys, D-01069 Dresden, Germany

[10] Leibniz Inst Festkorper & Werkstoffforsch, D-01171 Dresden, Germany

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 14期

关键词：

Neutron scattering - Metal insulator boundaries - Metals - Spin waves - Perovskite - Semiconductor insulator boundaries - Binary alloys;

D O I：

10.1103/PhysRevLett.113.147206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a neutron scattering study of the magnetic order and dynamics of the bilayer perovskite Sr3Fe2O7, which exhibits a temperature-driven metal-insulator transition at 340 K. We show that the Fe4+ moments adopt incommensurate spiral order below T-N = 115 K and provide a comprehensive description of the corresponding spin-wave excitations. The observed magnetic order and excitation spectra can be well understood in terms of an effective spin Hamiltonian with interactions ranging up to third-nearest-neighbor pairs. The results indicate that the helical magnetism in Sr3Fe2O7 results from competition between ferromagnetic double-exchange and antiferromagnetic superexchange interactions whose strengths become comparable near the metal-insulator transition. They thus confirm a decades-old theoretical prediction and provide a firm experimental basis for models of magnetic correlations in strongly correlated metals.

引用

页数：5

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