caa a22 4500 528785133 20190713030951.0 cr unu---uuuuu 180924s2016 xx s 000 0 eng 10.3929/ethz-b-000110109 doi 10.1038/ncomms10378 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/110109 Giant Phonon Anomaly associated with Superconducting Fluctuations in the Pseudogap Phase of Cuprates [Elektronische Daten] [Ye-Hua Liu, Robert M. Konik, T.M. Rice, Fu-Chun Zhang] Nat Commun Open access ethresearch 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. This proposal explains the intrinsic connection between the anomalous pseudogap phase, enhanced superconducting fluctuations and giant anomalies in the phonon spectra. Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 ethresearch Liu Ye-Hua joint author Konik Robert M. joint author Rice T.M. joint author Zhang Fu-Chun joint author Nature Communications London : Nature Publishing Group 7, p. 10378 2041-1723 http://hdl.handle.net/20.500.11850/110109 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/110109 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Liu Ye-Hua joint author ETHRESEARCH 700 1- Konik Robert M. joint author ETHRESEARCH 700 1- Rice T.M. joint author ETHRESEARCH 700 1- Zhang Fu-Chun joint author ETHRESEARCH 773 0- Nature Communications London : Nature Publishing Group 7, p. 10378 2041-1723 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access