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Title: Charge-screening role of c-axis atomic displacements in YBa2Cu3O6+x and related superconductors

Journal Article · · Physical Review B
 [1];  [2];  [2];  [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)

The importance of charge reservoir layers for supplying holes to the CuO2 planes of cuprate superconductors has long been recognized. Less attention has been paid to the screening of the charge transfer by the intervening ionic layers. We address this issue in the case of YBa2Cu3O6+x, where CuO chains supply the holes for the planes. We present a simple dielectric-screening model that gives a linear correlation between the relative displacements of ions along the c axis, determined by neutron powder diffraction, and the hole density of the planes. Applying this model to the temperature-dependent shifts of ions along the c axis, we infer a charge transfer of 5-10% of the hole density from the planes to the chains on warming from the superconducting transition to room temperature. Given the significant coupling of c-axis displacements to the average charge density, we point out the relevance of local displacements for screening charge modulations and note recent evidence for dynamic screening of in-plane quasiparticles. Furthermore, this line of argument leads us to a simple model for atomic displacements and charge modulation that is consistent with images from scanning-tunneling microscopy for underdoped Bi2Sr2CaCu2O8+δ.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC00112704; AC05-00OR22725
OSTI ID:
1247980
Alternate ID(s):
OSTI ID: 1239710; OSTI ID: 1261523
Report Number(s):
BNL-112056-2016-JA; PRBMDO; R&D Project: PO011; PO010; KC0201060
Journal Information:
Physical Review B, Vol. 93, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Evolution of the Hall Coefficient and the Peculiar Electronic Structure of the Cuprate Superconductors text January 2004
Anisotropic electron-phonon interaction in the cuprates text January 2004
The pseudogap: friend or foe of high Tc? text January 2005
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Cited By (2)

Local structure of Sr 2 CuO 3.3 , a 95 K cuprate superconductor without CuO 2 planes journal February 2020
Incommensurate Phonon Anomaly and the Nature of Charge Density Waves in Cuprates text January 2018

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