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Title: Giant phonon anomaly associated with superconducting fluctuations in the pseudogap phase of cuprates

The pseudogap in underdoped cuprates leads to significant changes in the electronic structure, and was later found to be accompanied by anomalous fluctuations of superconductivity and certain lattice phonons. Here we propose that the Fermi surface breakup due to the pseudogap, leads to a breakup of the pairing order into two weakly coupled sub-band amplitudes, and a concomitant low energy Leggett mode due to phase fluctuations between them. This increases the temperature range of superconducting fluctuations containing an overdamped Leggett mode. In this range inter-sub-band phonons show strong damping due to resonant scattering into an intermediate state with a pair of overdamped Leggett modes. In the ordered state, the Leggett mode develops a finite energy, changing the anomalous phonon damping into an anomaly in the dispersion. Finally, this proposal explains the intrinsic connection between the anomalous pseudogap phase, enhanced superconducting fluctuations and giant anomalies in the phonon spectra.
 [1] ;  [2] ;  [3] ;  [4]
  1. ETH Zurich, Zurich (Switzerland)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics
  3. ETH Zurich, Zurich (Switzerland); Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics
  4. Zhejiang Univ., Hangzhou (China).; Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC02-98CH10886; 11274269
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
Country of Publication:
United States