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Title: Phase competition and anomalous thermal evolution in high-temperature superconductors

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4];  [5]
  1. Nanjing Univ. (China). National Lab. of Solid State Microstructure
  2. Nanjing Univ. (China). National Lab. of Solid State Microstructure and Collaboration Innovation Center of Advanced Microstructures; Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  4. Beijing Computational Science Research Center (China)
  5. Zhejiang Normal Univ., Jinhua (China). Center for Statistical and Theoretical Condensed Matter Physics; Nanjing Univ. (China). National Lab. of Solid State Microstructure; Nanjing Univ. (China). Collaborative Innovative Center of Advanced Microstructures

The interplay of competing orders is relevant to high-temperature superconductivity known to emerge upon suppression of a parent antiferromagnetic order typically via charge doping. How such interplay evolves at low temperature—in particular at what doping level the zero-temperature quantum critical point (QCP) is located—is still elusive because it is masked by the superconducting state. The QCP had long been believed to follow a smooth extrapolation of the characteristic temperature T * for the strange normal state well above the superconducting transition temperature. However, recently the T * within the superconducting dome was reported to unexpectedly exhibit back-bending likely in the cuprate Bi 2 Sr 2 CaCu 2 O 8 + δ . We show that the original and revised phase diagrams can be understood in terms of weak and moderate competitions, respectively, between superconductivity and a pseudogap state such as d -density or spin-density wave, based on both Ginzburg-Landau theory and the realistic t - t ' - t ' ' - J - V model for the cuprates. We further found that the calculated temperature and doping-level dependence of the quasiparticle spectral gap and Raman response qualitatively agrees with the experiments. Particularly, the T * back-bending can provide a simple explanation of the observed anomalous two-step thermal evolution dominated by the superconducting gap and the pseudogap, respectively. These results imply that the revised phase diagram is likely to take place in high-temperature superconductors.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704; SC0012704
OSTI ID:
1372454
Alternate ID(s):
OSTI ID: 1369485
Report Number(s):
BNL-114058-2017-JA; PRBMDO; R&D Project: PO015; KC0202030; TRN: US1702773
Journal Information:
Physical Review. B, Vol. 96, Issue 4; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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Cited By (1)

Hole pairing and ground state properties of high-T c superconductivity within the t–t′–J–V model journal April 2018