Electronic specific heat constant

TABLE 10. Electronic Specific Heat Constant (y), Electron-Electron (Coulomb) Coupling Constant (p ), Electron-Phonon Coupling Constant (X), Debye Temperature at 0 K(0p), and Superconducting Transition Temperature... 

The term heavy fermion was coined by Steglich, since the quasi-particle is a fermion (i.e. obeys Fermi statistics) and its mass is extremely large, several hundreds to thousand times larger than that of a free electron. This mass is measured by the electronic specific heat constant, since y/yo = m /m where yo is the unenhanced electronic specific heat constant as calculated from the band structure and m is the free-electron mass and m is the effective mass of the electron. Since yo is of the order... 

Hail coefficient T = temperature in kelvin U = intra-atomic Coulomb repulsion energy y = electronic specific heat constant A = band width... 

The electronic specific heat constant y = is a heavy-fermion system with an... 

As already discussed for YC02, the quenching of spin fluctuations at the MT, evidenced by the reduction of the electronic specific heat constant, has also been derived from thermodynamical analysis for several Y(Coi tAl t)2 (Sakakibara et al. 1992) and Lu(Coi tGa2 )2 (Murata et al. 1993a,b) compounds. In order to confirm directly the reduction of 7 at the MT, the specific heat has been measured for Lu(Coo,9iGao.o9)2-The result is presented in fig. 32. This compound shows a low value (about 5T). The value of y, which is 35.5 mJ/K mol in zero field, decreases during the MT and... 

Fig. 32. The field dependence of the magnetization and the electronic specific heat constant for Lu(Q)Q Ga(i( )2. (After Muiata et al. 1991.)...

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