Enhancement of the Nernst effect by stripe order in a high-Tc superconductor

被引：115

作者：

Cyr-Choiniere, Olivier ^{[1
,2
]}

Daou, R. ^{[1
,2
]}

Laliberte, Francis ^{[1
,2
]}

LeBoeuf, David ^{[1
,2
]}

Doiron-Leyraud, Nicolas ^{[1
,2
]}

Chang, J. ^{[1
,2
]}

Yan, J. -Q. ^{[3
]}

Cheng, J. -G. ^{[3
]}

Zhou, J. -S. ^{[3
]}

Goodenough, J. B. ^{[3
]}

Pyon, S. ^{[4
]}

Takayama, T. ^{[4
]}

Takagi, H. ^{[4
,5
]}

Tanaka, Y. ^{[4
,6
]}

Taillefer, Louis ^{[1
,2
,7
]}

机构：

[1] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

[2] Univ Sherbrooke, RQMP, Sherbrooke, PQ J1K 2R1, Canada

[3] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA

[4] Univ Tokyo, Dept Adv Mat, Kashiwa, Chiba 2778561, Japan

[5] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

[6] RIKEN, SPring8 Ctr, Mikazuki, Hyogo 6795148, Japan

[7] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

来源：

NATURE | 2009年 / 458卷 / 7239期

基金：

美国国家科学基金会; 瑞士国家科学基金会;

关键词：

FERMI-SURFACE;

D O I：

10.1038/nature07931

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：

The Nernst effect in metals is highly sensitive to two kinds of phase transition: superconductivity and density-wave order(1). The large, positive Nernst signal observed in hole-doped high-T-c superconductors(2) above their transition temperature (T-c) has so far been attributed to fluctuating superconductivity(3). Here we report that in some of these materials the large Nernst signal is in fact the result of stripe order, a form of spin/charge modulation(4) that causes a reconstruction of the Fermi surface(5). In La2-xSrxCuO4 (LSCO) doped with Nd or Eu, the onset of stripe order causes the Nernst signal to change from being small and negative to being large and positive, as revealed either by lowering the hole concentration across the quantum critical point in Nd-doped LSCO (refs 6-8) or by lowering the temperature across the ordering temperature in Eu-doped LSCO (refs 9, 10). In the second case, two separate peaks are resolved, respectively associated with the onset of stripe order at high temperature and superconductivity near T-c.

引用

页码：743 / 745

页数：3

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