Spin-Order Driven Fermi Surface Reconstruction Revealed by Quantum Oscillations in an Underdoped High Tc Superconductor

被引：34

作者：

Sebastian, Suchitra E. ^{[1
]}

Harrison, N. ^{[2
]}

Mielke, C. H. ^{[2
]}

Liang, Ruixing ^{[3
,4
]}

Bonn, D. A. ^{[3
,4
]}

Hardy, W. N. ^{[3
,4
]}

Lonzarich, G. G. ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 OHE, England

[2] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA

[3] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z4, Canada

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

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 25期

基金：

美国国家科学基金会;

关键词：

STATE; PHYSICS;

D O I：

10.1103/PhysRevLett.103.256405

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use quantum oscillation measurements to distinguish between spin and orbital components of the lowest energy quasiparticle excitations in YBa2Cu3O6.54, each of which couple differently to a magnetic field. Our measurements reveal the phase of the observed quantum oscillations to remain uninverted over a wide angular range, indicating that the twofold spin degeneracy of the Landau levels is virtually unaltered by the magnetic field. The inferred suppression of the spin degrees of freedom indicates a spin-density wave is responsible for creation of the small Fermi surface pockets in underdoped YBa2Cu3O6+x-further suggesting that excitations of this phase are important contributors to the unconventional superconducting pairing mechanism.

引用

页数：4

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