Physics – Condensed Matter – Superconductivity
Scientific paper
2004-05-13
Physica B 352 (2004) 285
Physics
Condensed Matter
Superconductivity
To be published in Physica B
Scientific paper
10.1016/j.physb.2004.07.022
The temperature dependent properties of heat capacity, heat conductivity and Hall-Lorenz ratio have been solved numerically after taking the previously proposed ionization energy based Fermi-Dirac statistics and the coexistence of Fermi and charge-spin separated liquid into account. The thermo-magneto-electronic properties are entirely for spin and charge carriers, hence the phonon contribution has been neglected. A linear dependence between the Hall-Lorenz ratio and temperature ($T$) is also obtained in accordance with the experimental results for overdoped YBa$_2$Cu$_3$O$_{7-\delta}$, if these conditions, $E_I$ $<$ $T_c$ with respect to resistivity and there are no spinon pairings ($T^*$ = 0) are satisfied. Heat conductivity based on both pure and electron-contaminated charge-spin separated liquid in $ab$-planes above $T_c$ are found to increase with decreasing $T$ as a consequence of inverse proportionality with $T$. The $T$-dependence of heat capacity are also highlighted, which qualitatively complies with the experimental findings.
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