Electron–phonon coupling and longitudinal sound velocity in heavy fermion systems

2005 ◽  
Vol 367 (1-4) ◽  
pp. 101-113 ◽  
Author(s):  
G.C. Rout ◽  
M.S. Ojha ◽  
S.N. Behera
Keyword(s):  
Sound Velocity ◽  
Heavy Fermion ◽  
Phonon Coupling ◽  
Fermion Systems ◽  
Electron Phonon Coupling ◽  
Longitudinal Sound Velocity ◽  
Heavy Fermion Systems

ULTRASONIC PROPERTIES AND ELECTRON-PHONON COUPLING CONSTANT IN TlSr2(M1 - xYx)Cu2O7 (M = Ca, Sr) SUPERCONDUCTOR

2002 ◽  
Vol 16 (32) ◽  
pp. 4923-4933 ◽  
Author(s):  
Z. R. HASSAN ◽  
R. ABD-SHUKOR ◽  
H. A. ALWI
Keyword(s):  
Sound Velocity ◽  
High Temperature Superconductors ◽  
Bcs Theory ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Ultrasonic Properties ◽  
Electron Phonon Coupling ◽  
Longitudinal Sound Velocity ◽  
Slope Change ◽  
Local Oxygen

Ultrasonic properties of bulk TlSr 2 ( M 1 - x Y x) Cu 2 O 7( M = Ca , Sr ) high temperature superconductors have been measured between 80 and 280 K. Sound velocity measurements show that all samples exhibit an overall stiffening trend with decreasing temperature. The longitudinal sound velocity shows a pronounced slope change and attenuation peak around 200 K. The results were explained in terms of phase transition and distortion of Tl and O atoms associated with local oxygen ordering. The calculated acoustic Debye temperature does not show strong correlation with the transition temperature. The electron-phonon coupling constant was calculated using the weak and strong limit of the BCS theory as well as the van Hove scenario.

Spin relaxation dynamics in heavy-fermion systems

1989 ◽  
Vol 156-157 ◽  
pp. 794-797 ◽  
Author(s):  
A. Loidl ◽  
G. Knopp ◽  
H. Spille ◽  
F. Steglich ◽  
A.P. Murani
Keyword(s):  
Spin Relaxation ◽  
Heavy Fermion ◽  
Relaxation Dynamics ◽  
Fermion Systems ◽  
Heavy Fermion Systems
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