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

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms10378· OSTI ID:1258648
 [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)
+ Show Author Affiliations
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.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-98CH10886
OSTI ID:
1258648
Alternate ID(s):
OSTI ID: 1335422
Journal Information:
Nature Communications, Journal Name: Nature Communications Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Incommensurate Phonon Anomaly and the Nature of Charge Density Waves in Cuprates text January 2018
High field charge order across the phase diagram of YBa2Cu3Oy journal March 2018
High-temperature charge density wave correlations in La 1.875 Ba 0.125 CuO 4 without spin–charge locking journal November 2017
Theory perspective: SCES 2016 journal September 2016
Anomalies in the pseudogap phase of the cuprates: competing ground states and the role of umklapp scattering journal October 2019
Two-band superfluidity and intrinsic Josephson effect in alkaline-earth-metal Fermi gases across an orbital Feshbach resonance journal July 2016
Incommensurate Phonon Anomaly and the Nature of Charge Density Waves in Cuprates journal January 2018
High field charge order across the phase diagram of $YBa_2Cu_3O_y$ preprint January 2017
High field charge order across the phase diagram of YBa₂Cu₃Oy text January 2018

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36 MATERIALS SCIENCE