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Experimental investigation of the competing orders and quantum criticality in hole- and electron-doped cuprate superconductors

Yeh, N.-C. and Chen, C.-T. and Zapf, V. S. and Beyer, A. D. and Hughes, C. R. and Park, M.-S. and Kim, K.-H. and Lee, S.-I. (2005) Experimental investigation of the competing orders and quantum criticality in hole- and electron-doped cuprate superconductors. Chinese Journal of Physics, 43 (3-II). pp. 505-514. ISSN 0577-9073. http://resolver.caltech.edu/CaltechAUTHORS:YEHcjp05

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Abstract

We investigate the issues of competing orders and quantum criticality in cuprate superconductors via experimental studies of the high-field thermodynamic phase diagrams and the quasiparticle tunneling spectroscopy. Substantial field-induced quantum fluctuations are found in all cuprates investigated, and the corresponding correlation with quasiparticle spectra suggest that both electron- (n-type) and hole-doped (p-type) cuprate superconductors are in close proximity to a quantum critical point that separates a pure superconducting (SC) phase from a phase consisting of coexisting SC and a competing order. We further suggests that the relevant competing order is likely a spin-density wave (SDW) or a charge density wave (CDW), which can couple efficiently to an in-plane Cu-O bond stretching longitudinal optical (LO) phonon mode in the p-type cuprates but not in the n-type cuprates. This cooperative interaction may account for the pseudogap phenomenon above T, only in the p-type cuprate superconductors.


Item Type:Article
Additional Information:© 2005 The Physical Society of the Republic of China. The work at Caltech is supported by the National Science Foundation through Grants #DMR-0405088 and #DMR-0103045, and at the Pohang University by the Ministry of Science and Technology of Korea.
Subject Keywords:HIGH-TEMPERATURE SUPERCONDUCTORS; SINGLE-CRYSTALS; PAIRING SYMMETRY; IMPURITY ATOMS; BI2SR2CACU2O8+DELTA; PSEUDOGAP; FLUCTUATIONS; YBA2CU3O7-DELTA; TRANSITION; VORTICES
Record Number:CaltechAUTHORS:YEHcjp05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:YEHcjp05
Alternative URL:http://psroc.phys.ntu.edu.tw/cjp/find_content.php?year=2005&vol=43&no=3-%A2%BA
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1475
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Jan 2006
Last Modified:26 Dec 2012 08:44

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