scholarly journals Properties and Applications of Bulk High Temperature Superconductors. Thermal Conductivity of (Nd,Eu,Gd)Ba2Cu3Oy Bulk Superconductors.

1999 ◽  
Vol 34 (11) ◽  
pp. 621-624 ◽  
Author(s):  
Koshichi NOTO ◽  
Takashi ITO ◽  
Ayako SUGIYAMA ◽  
Masato MURAKAMI ◽  
Miryala MURALIDHAR ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
High Temperature Superconductors ◽  
Bulk Superconductors

THERMAL CONDUCTIVITY OF HIGH TEMPERATURE SUPERCONDUCTORS

1991 ◽  
Vol 05 (12) ◽  
pp. 2003-2035 ◽  
Author(s):  
MANUEL D. NUÑEZ REGUEIRO ◽  
DARÍO CASTELLO
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Transition Temperature ◽  
Phonon Scattering ◽  
High Temperature Superconductors ◽  
Low Energy ◽  
Disordered Materials ◽  
Superconducting Transition ◽  
Universal Pattern ◽  
Heat Carriers

We review and analyze the data on the thermal conductivity of both ceramic and single crystal samples of high temperature superconductors. A universal pattern can be extracted and interpreted in the following way: phonons are the main heat carriers in these materials, and in the high temperature range the thermal conductivity κ is almost constant due to phonon scattering against disorder; below the superconducting transition temperature κ increases as phonon scattering against carriers condensing into the superconducting state decreases and at still lower temperatures there is a region in which a T2 law is obeyed that most probably is due to resonant phonon scattering against low energy excitations, i.e. tunneling systems similar to those found in disordered materials. The origin of the relevant disorder is discussed.

THEORY OF THERMAL CONDUCTIVITY OF HIGH TEMPERATURE SUPERCONDUCTORS: A NEW APPROACH

2011 ◽  
Vol 25 (09) ◽  
pp. 663-678 ◽  
Author(s):  
VINOD ASHOKAN ◽  
B. D. INDU
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Phonon Scattering ◽  
High Temperature Superconductors ◽  
Relaxation Times ◽  
Impurity Scattering ◽  
Resonance Scattering ◽  
Perturbative Approach ◽  
Conductivity Curve ◽  
Line Widths

An ab initio formulation of relaxation times of various contributing processes have been observed with newer understanding in terms of electron and phonon line widths. This is dealt with the help of double time temperature-dependent Green's function via a non-perturbative approach using a crystal Hamiltonian which comprises of the effects of electrons, phonons, impurities, anharmonicities and interactions thereof. The frequency line widths is observed as an extremely sensitive quantity in the transport phenomena of high temperature superconductors (HTS) as a collection of a large number of scattering processes, namely: boundary scattering, impurity scattering, multi-phonon scattering, interference scattering, electron–phonon processes and resonance scattering. The behavior of electrons and phonons is then investigated to describe the thermal conductivity of a variety of HTS samples specially in the vicinity of transition temperature to successfully explain the spectacular dip region of thermal conductivity curve which was lacking in explanation earlier with a sound physical justification.

Thermal conductivity and “disorder” in high temperature superconductors

1988 ◽  
Vol 67 (4) ◽  
pp. 401-404 ◽  
Author(s):  
M. Núñez Regueiro ◽  
M.A. Izbizky ◽  
P. Esquinazi
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
High Temperature Superconductors

Nonequilibrium effects in the thermal conductivity of Bi-based high temperature superconductors

1994 ◽  
Vol 91 (7) ◽  
pp. 571-575 ◽  
Author(s):  
H. Bougrine ◽  
S. Sergeenkov ◽  
M. Ausloos ◽  
R. Cloots ◽  
V.V. Gridin
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
High Temperature Superconductors ◽  
Nonequilibrium Effects
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