Critical spin fluctuations and the origin of nematic order in Ba(Fe 1-x Co x ) 2 As 2

被引：0

作者：

Kretzschmar F. ^{[1
,2
]}

Böhm T. ^{[1
,2
]}

Karahasanović U. ^{[3
]}

Muschler B. ^{[1
,2
,7
]}

Baum A. ^{[1
,2
]}

Jost D. ^{[1
,2
]}

Schmalian J. ^{[3
]}

Caprara S. ^{[4
]}

Grilli M. ^{[4
]}

Di Castro C. ^{[4
]}

Analytis J.G. ^{[5
,6
,8
]}

Chu J.-H. ^{[5
,6
]}

Fisher I.R. ^{[5
,6
]}

Hackl R. ^{[1
]}

机构：

[1] Walther Meissner Institut, Bayerische Akademie der Wissenschaften, Garching

[2] Fakultät für Physik E23, Technische Universität München, Garching

[3] Institute for Theoretical Condensed Matter Physics (TKM), Institut für Festkörperphysik, Karlsruhe Institute of Technology (KIT), Karlsruhe

[4] Department of Physics, University of Rome 'Sapienza', Roma

[5] Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, 94025, CA

[6] Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, 94305, CA

[7] Zoller and Fröhlich GmbH, Simoniusstrasse 22, Wangen im Allgäu

[8] Department of Physics, University of California, Berkeley, 94720, CA

来源：

Nature Physics | 2016年 / 12卷 / 6期

关键词：

D O I：

10.1038/nphys3634

中图分类号：

学科分类号：

摘要：

Nematic fluctuations and order play a prominent role in material classes such as the cuprates, some ruthenates or the iron-based compounds and may be interrelated with superconductivity. In iron-based compounds signatures of nematicity have been observed in a variety of experiments. However, the fundamental question as to the relevance of the related spin, charge or orbital fluctuations remains open. Here, we use inelastic light (Raman) scattering and study Ba(Fe 1-x Co x ) 2 As 2 (0 ≤ x ≤ 0.085) for getting direct access to nematicity and the underlying critical fluctuations with finite characteristic wavelengths. We show that the response from fluctuations appears only in B 1g (x 2 - y 2) symmetry (1 Fe unit cell). The scattering amplitude increases towards the structural transition at T s but vanishes only below the magnetic ordering transition at T SDW < T s, suggesting a magnetic origin of the fluctuations. The theoretical analysis explains the selection rules and the temperature dependence of the fluctuation response. These results make magnetism the favourite candidate for driving the series of transitions. © 2016 Macmillan Publishers Limited.

引用

页码：560 / 563

页数：3

共 35 条

[31] Rotter M., Tegel M., Johrendt D., Superconductivity at 38K in the iron arsenide (Ba <sub>1-x</sub> Kx )Fe2As2 , Phys. Rev. Lett, 101, (2008)
[32] Devereaux T.P., Hackl R., Inelastic light scattering from correlated electrons, Rev. Mod. Phys, 79, pp. 175-233, (2007)
[33] Gotze W., Wolfle P., Homogeneous dynamical conductivity of simple metals, Phys. Rev. B, 6, pp. 1226-1238, (1972)
[34] Allen J.W., Mikkelsen J.C., Optical properties of CrSb, MnSb, NiSb, and NiAs, Phys. Rev. B, 15, pp. 2952-2960, (1977)
[35] Opel M., Et al., Carrier relaxation, pseudogap, and superconducting gap in high-Tc cuprates: A Raman scattering study, Phys. Rev. B, 61, pp. 9752-9774, (2000)

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