Magnetic anisotropic energy gap and low-energy spin wave excitation in the antiferromagnetic block phase of K_2Fe_4Se_5

Y. Xiao; S. Nandi; Y. Su; S. Price; H.-F. Li; Z. Fu; W. Jin; A. Piovano; A. Ivanov; K. Schmalzl; W. Schmidt; T. Chatterji; Th. Wolf; Th. Brueckel

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Magnetic anisotropic energy gap and low-energy spin wave excitation in the antiferromagnetic block phase of K_2Fe_4Se_5

机译：K_2Fe_4Se_5的反铁磁块相中的磁各向异性能隙和低能自旋波激发

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Neutron scattering experiments were performed to investigate magnetic order and magnetic excitations in ternary iron chalcogenide K_2Fe_4Se_5. The formation of a superlattice structure below 580 K together with the decoupling between the Fe-vacancy order-disorder transition and the antiferromagnetic order transition appears to be a common feature in the K_2Fe_4Se_5 family. The study of spin dynamics of K_2Fe_4Se_5 reveals two distinct energy gaps at the magnetic Brillouin zone center, which indicates the presence of magnetic anisotropy and the decrease of local symmetry due to electronic and orbital anisotropy. The low-energy spin wave excitations of K_2Fe_4Se_5 can be properly described by linear spin wave theory within a Heisenberg model. Compared to iron pnictides, K_2Fe_4Se_5 exhibits a more two-dimensional magnetism as characterized by large differences not only between out-of-plane and in-plane spin wave velocities, but also between out-of-plane and in-plane exchange interactions.

机译：进行中子散射实验以研究三元硫族元素K_2Fe_4Se_5中的磁序和磁激发。在K_2Fe_4Se_5族中，在580 K以下形成超晶格结构以及Fe空位-无序转变和反铁磁有序转变之间的去耦似乎是一个共同特征。对K_2Fe_4Se_5自旋动力学的研究揭示了在磁布里渊区中心有两个不同的能隙，这表明存在磁各向异性，并且由于电子和轨道各向异性而导致局部对称性降低。可以通过Heisenberg模型中的线性自旋波理论适当描述K_2Fe_4Se_5的低能自旋波激发。与铁素化物相比，K_2Fe_4Se_5表现出更多的二维磁性，其特征不仅在于平面外和平面内自旋波速度之间以及平面外和平面内交换相互作用之间存在较大差异。

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来源
《Physical review》 |2013年第14期|140408.1-140408.6|共6页
作者
Y. Xiao; S. Nandi; Y. Su; S. Price; H.-F. Li; Z. Fu; W. Jin; A. Piovano; A. Ivanov; K. Schmalzl; W. Schmidt; T. Chatterji; Th. Wolf; Th. Brueckel;
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Jiilich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH, D-52425 Juelich, Germany;

Jiilich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH, D-52425 Juelich, Germany;

Juelich Centre for Neutron Science JCNS-FRM Ⅱ, Forschungszentrum Juelich GmbH, Outstation at FRM Ⅱ, Lichtenbergstrasse 1, D-85747 Garching, Germany;

Jiilich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH, D-52425 Juelich, Germany;

Juelich Centre for Neutron Science, Forschungszentrum Juelich, Outstation at Institut Laue-Langevin, Boite Postale 156, 38042 Grenoble Cedex 9, France;

Juelich Centre for Neutron Science JCNS-FRM Ⅱ, Forschungszentrum Juelich GmbH, Outstation at FRM Ⅱ, Lichtenbergstrasse 1, D-85747 Garching, Germany;

Jiilich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH, D-52425 Juelich, Germany;

Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, France;

Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, France;

Juelich Centre for Neutron Science, Forschungszentrum Juelich, Outstation at Institut Laue-Langevin, Boite Postale 156, 38042 Grenoble Cedex 9, France;

Juelich Centre for Neutron Science, Forschungszentrum Juelich, Outstation at Institut Laue-Langevin, Boite Postale 156, 38042 Grenoble Cedex 9, France;

Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, France;

Institut fuer Festkoerperphysik, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany;

Jiilich Centre for Neutron Science JCNS and Peter Gruenberg Institut PGI, JARA-FIT, Forschungszentrum Juelich GmbH, D-52425 Juelich, Germany,Juelich Centre for Neutron Science JCNS-FRM Ⅱ, Forschungszentrum Juelich GmbH, Outstation at FRM Ⅱ, Lichtenbergstrasse 1, D-85747 Garching, Germany,Juelich Centre for Neutron Science, Forschungszentrum Juelich, Outstation at Institut Laue-Langevin, Boite Postale 156, 38042 Grenoble Cedex 9, France;

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spin waves; neutron inelastic scattering;

机译：自旋波中子非弹性散射;

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Magnetic anisotropic energy gap and low-energy spin wave excitation in the antiferromagnetic block phase of K_2Fe_4Se_5

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