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Journal Article
Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3O6.67
2012
Overview
X-ray diffraction experiments reveal that spatial charge ordering occurs in the pseudogap state of YBa
2
Cu
3
O
6.67
. Moreover, this charge ordered state competes with high-temperature superconductivity, and their relative strengths can be tuned using a magnetic field.
Superconductivity often emerges in the proximity of, or in competition with, symmetry-breaking ground states such as antiferromagnetism or charge density waves
1
,
2
,
3
,
4
,
5
(CDW). A number of materials in the cuprate family, which includes the high transition-temperature (high-
T
c
) superconductors, show spin and charge density wave order
5
,
6
,
7
. Thus a fundamental question is to what extent do these ordered states exist for compositions close to optimal for superconductivity. Here we use high-energy X-ray diffraction to show that a CDW develops at zero field in the normal state of superconducting YBa
2
Cu
3
O
6.67
(
T
c
= 67 K). This sample has a hole doping of 0.12 per copper and a well-ordered oxygen chain superstructure
8
. Below
T
c
, the application of a magnetic field suppresses superconductivity and enhances the CDW. Hence, the CDW and superconductivity in this typical high-
T
c
material are competing orders with similar energy scales, and the high-
T
c
superconductivity forms from a pre-existing CDW environment. Our results provide a mechanism for the formation of small Fermi surface pockets
9
, which explain the negative Hall and Seebeck effects
10
,
11
and the ‘
T
c
plateau’
12
in this material when underdoped.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
