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Title: Cuprate phase diagram and the influence of nanoscale inhomogeneities

Abstract

The phase diagram associated with high-Tc superconductors is complicated by an array of different ground states. The parent material represents an antiferromagnetic insulator but with doping superconductivity becomes possible with transition temperatures previously thought unattainable. The underdoped region of the phase diagram is dominated by the so-called pseudogap phenomena, whereby in the normal state the system mimics superconductivity in its spectral response but does not show the complete loss of resistivity associated with the superconducting state. An understanding of this regime presents one of the great challenges for the field. In the present study we revisit the structure of the phase diagram as determined in photoemission studies. By careful analysis of the role of nanoscale inhomogeneities in the overdoped region, we are able to more carefully separate out the gaps due to the pseudogap phenomena from the gaps due to the superconducting transition. Within a mean-field description, we are thus able to link the magnitude of the doping-dependent pseudogap directly to the Heisenberg exchange interaction term, J Sigma s(i)s(j), contained in the t - J model. This approach provides a clear indication that the pseudogap is associated with spin singlet formation.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science - Energy Frontier Research Center - Center for Emergent Superconductivity; USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1419962
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 96; Journal Issue: 19
Country of Publication:
United States
Language:
English

Citation Formats

Zaki, N., Yang, H. -B., Rameau, J. D., Johnson, P. D., Claus, H., and Hinks, D. G.. Cuprate phase diagram and the influence of nanoscale inhomogeneities. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.195163.
Zaki, N., Yang, H. -B., Rameau, J. D., Johnson, P. D., Claus, H., & Hinks, D. G.. Cuprate phase diagram and the influence of nanoscale inhomogeneities. United States. doi:10.1103/PhysRevB.96.195163.
Zaki, N., Yang, H. -B., Rameau, J. D., Johnson, P. D., Claus, H., and Hinks, D. G.. Wed . "Cuprate phase diagram and the influence of nanoscale inhomogeneities". United States. doi:10.1103/PhysRevB.96.195163.
@article{osti_1419962,
title = {Cuprate phase diagram and the influence of nanoscale inhomogeneities},
author = {Zaki, N. and Yang, H. -B. and Rameau, J. D. and Johnson, P. D. and Claus, H. and Hinks, D. G.},
abstractNote = {The phase diagram associated with high-Tc superconductors is complicated by an array of different ground states. The parent material represents an antiferromagnetic insulator but with doping superconductivity becomes possible with transition temperatures previously thought unattainable. The underdoped region of the phase diagram is dominated by the so-called pseudogap phenomena, whereby in the normal state the system mimics superconductivity in its spectral response but does not show the complete loss of resistivity associated with the superconducting state. An understanding of this regime presents one of the great challenges for the field. In the present study we revisit the structure of the phase diagram as determined in photoemission studies. By careful analysis of the role of nanoscale inhomogeneities in the overdoped region, we are able to more carefully separate out the gaps due to the pseudogap phenomena from the gaps due to the superconducting transition. Within a mean-field description, we are thus able to link the magnitude of the doping-dependent pseudogap directly to the Heisenberg exchange interaction term, J Sigma s(i)s(j), contained in the t - J model. This approach provides a clear indication that the pseudogap is associated with spin singlet formation.},
doi = {10.1103/PhysRevB.96.195163},
journal = {Physical Review B},
number = 19,
volume = 96,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}