Magnetically driven suppression of nematic order in an iron-based superconductor

被引：148

作者：

Avci, S. ^{[1
]}

Chmaissem, O. ^{[1
,2
]}

Allred, J. M. ^{[1
]}

Rosenkranz, S. ^{[1
]}

Eremin, I. ^{[3
]}

Chubukov, A. V. ^{[4
]}

Bugaris, D. E. ^{[1
]}

Chung, D. Y. ^{[1
]}

Kanatzidis, M. G. ^{[1
,5
]}

Castellan, J. -P ^{[1
]}

Schlueter, J. A. ^{[1
]}

Claus, H. ^{[1
]}

Khalyavin, D. D. ^{[6
]}

Manuel, P. ^{[6
]}

Daoud-Aladine, A. ^{[6
]}

Osborn, R. ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[2] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

[3] Ruhr Univ Bochum, Inst Theoret Phys 3, D-44801 Bochum, Germany

[4] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[5] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

[6] Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Facil, Didcot OX11 0QX, Oxon, England

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

关键词：

HIGH-TEMPERATURE SUPERCONDUCTIVITY; TRANSITION;

D O I：

10.1038/ncomms4845

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：

A theory of superconductivity in the iron-based materials requires an understanding of the phase diagram of the normal state. In these compounds, superconductivity emerges when stripe spin density wave (SDW) order is suppressed by doping, pressure or atomic disorder. This magnetic order is often pre-empted by nematic order, whose origin is yet to be resolved. One scenario is that nematic order is driven by orbital ordering of the iron 3d electrons that triggers stripe SDW order. Another is that magnetic interactions produce a spin-nematic phase, which then induces orbital order. Here we report the observation by neutron powder diffraction of an additional fourfold-symmetric phase in Ba1-xNaxFe2As2 close to the suppression of SDW order, which is consistent with the predictions of magnetically driven models of nematic order.

引用

页数：6

共 37 条

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