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Title: Cuprate phase diagram and the influence of nanoscale inhomogeneities

Journal Article · · Physical Review B

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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Organization:
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
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1419962
Journal Information:
Physical Review B, Vol. 96, Issue 19; ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

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Cited By (7)

Emergence of superconductivity in the cuprates via a universal percolation process journal October 2018
Universal superconducting precursor in three classes of unconventional superconductors journal June 2019
Photoemission perspective on pseudogap, superconducting fluctuations, and charge order in cuprates: a review of recent progress journal April 2018
Anomalies in the pseudogap phase of the cuprates: competing ground states and the role of umklapp scattering journal October 2019
Combined spectroscopic imaging STM and ARPES study of different gaps measured in the cuprate phase diagram journal January 2020
Low-energy antiferromagnetic spin fluctuations limit the coherent superconducting gap in cuprates journal December 2018
Low-energy antiferromagnetic spin fluctuations limit the coherent superconducting gap in cuprates text January 2018

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