Phonon Screening in High-Temperature Superconductors

Journal Article · Mon Jun 05 00:00:00 EDT 2000 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.84.5391· OSTI ID:20216798

Homes, C C ^[1]; McConnell, A W ^[2]; Clayman, B P ^[2]; Bonn, D A ^[3]; Liang, Ruixing ^[3]; Hardy, W N ^[3]; Inoue, M ^[4]; Negishi, H ^[4]; Fournier, P ^[5]; Greene, R L ^[5]

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1. Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States)
2. Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6 (Canada)
3. Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1 (Canada)
4. Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8526, (Japan)
5. Center for Superconductivity Research, Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742 (United States)

In good conductors optical phonons are usually screened, and therefore not observed. However, sharp features due to infrared-active modes in the copper-oxygen planes are observed in the optical conductivity of Pr{sub 1.85} Ce{sub 0.15} CuO{sub 4} and YBa{sub 2}Cu {sub 3}O{sub 6.95} . Oscillator strengths indicate that the screening of these modes is poor or totally absent. These materials are compared with {eta}-Mo{sub 4}O{sub 11} , in which lattice modes appear suddenly below the charge-density wave transition. It is proposed that poor screening in the cuprates originates from fluctuating charge inhomogeneities in the copper-oxygen planes. (c) 2000 The American Physical Society.

• OSTI ID: 20216798
• Journal Information: Physical Review Letters, Vol. 84, Issue 23; Other Information: PBD: 5 Jun 2000; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
PRASEODYMIUM OXIDES
CERIUM OXIDES
COPPER OXIDES
YTTRIUM OXIDES
BARIUM OXIDES
PHONONS
SCREENING
OSCILLATOR STRENGTHS
LATTICE VIBRATIONS
FLUCTUATIONS
EXPERIMENTAL DATA