Phonon spectra and lattice specific heats of the thallium-based high-temperature superconductors

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.5451· OSTI ID:5623499

Kulkarni, A D; de Wette, F W ^[1]; Prade, J; Schroeder, U ^[2]; Kress, W ^[3]

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1. Department of Physics, University of Texas, Austin, Texas 78712-1081 (USA)
2. Universitaet Regensburg, D-8400 Regensburg, Federal Republic of Germany (DE)
3. Max-Planck-Institut fuer Festkoerperforschung, D-7000 Stuttgart 80, Federal Republic of Germany (DE)

We present the phonon-dispersion curves, the one-phonon densities of state, the lattice specific heat {ital c}{sub {ital v}}({ital T}), and the Debye temperatures {ital FTHETA}({ital T}) of the thallium-based high-temperature superconductors, based on full lattice dynamical calculations. Repelling effects due to hybridization of the low-lying transverse acoustic and optical modes lead to small Debye regions of the specific heat ({le}4 K), while the occurrence of low-lying dispersionless transverse modes in the outer parts of the Brillouin zone causes large drops in the Debye temperatures {ital FTHETA}({ital T}) in the range 0 to 20 K. These effects are extremely pronounced in Tl{sub 2}Ca{sub 2}Ba{sub 2}Cu{sub 3}O{sub 10} because of the appearance of very-low-frequency modes.

• OSTI ID: 5623499
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:7; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METALS
BARIUM
BRILLOUIN ZONES
CALCIUM
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DEBYE TEMPERATURE
DISPERSION RELATIONS
ELEMENTS
ENERGY-LEVEL DENSITY
HIGH-TC SUPERCONDUCTORS
LATTICE VIBRATIONS
METALS
OXIDES
OXYGEN COMPOUNDS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
SPECIFIC HEAT
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ZONES