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Spatially inhomogeneous competition between superconductivity and the charge density wave in YBa2Cu3O6.67.

ABSTRACT: The charge density wave in the high-temperature superconductor YBa2Cu3O7-x (YBCO) has two different ordering tendencies differentiated by their c-axis correlations. These correspond to ferro- (F-CDW) and antiferro- (AF-CDW) couplings between CDWs in neighbouring CuO2 bilayers. This discovery has prompted several fundamental questions: how does superconductivity adjust to two competing orders and are either of these orders responsible for the electronic reconstruction? Here we use x-ray diffraction to study YBa2Cu3O6.67 as a function of magnetic field and temperature. We show that regions with F-CDW correlations suppress superconductivity more strongly than those with AF-CDW correlations. This implies that an inhomogeneous superconducting state exists, in which some regions show a fragile form of superconductivity. By comparison of F-CDW and AF-CDW correlation lengths, it is concluded that F-CDW ordering is sufficiently long-range to modify the electronic structure. Our study thus suggests that F-CDW correlations impact both the superconducting and normal state properties of YBCO.

SUBMITTER: Choi J 

PROVIDER: S-EPMC7033133 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Spatially inhomogeneous competition between superconductivity and the charge density wave in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6.67</sub>.

Choi J J   Ivashko O O   Blackburn E E   Liang R R   Bonn D A DA   Hardy W N WN   Holmes A T AT   Christensen N B NB   Hücker M M   Gerber S S   Gutowski O O   Rütt U U   Zimmermann M V MV   Forgan E M EM   Hayden S M SM   Chang J J  

Nature communications 20200220 1

The charge density wave in the high-temperature superconductor YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> (YBCO) has two different ordering tendencies differentiated by their c-axis correlations. These correspond to ferro- (F-CDW) and antiferro- (AF-CDW) couplings between CDWs in neighbouring CuO<sub>2</sub> bilayers. This discovery has prompted several fundamental questions: how does superconductivity adjust to two competing orders and are either of these orders responsible for the electronic  ...[more]