In the framework of the bisoliton model we have studied the critical temperature T c, as a function of the pressure P and of the hole concentration δ for the high temperature superconductors YBa2Cu3Ox and (La1-xMx)2CuO4. Our results for δ ln Tc/δ ln V as a function of T c describe quite satisfactorily the general trend of the experimental data. Furthermore we show that in the bisoliton model the energy gap δ (in units of Jg3/3, where J is the nearest-neighbour exchange integral and g is the nonlinearity parameter) is an universal function of δ/g. An analogous property is valid for T c By fitting the maximum value of T c we are able also to reproduce the experimental data for T c(δ).
On the dependence of the critical temperature on pressure in the bisoliton model of high temperature superconductors
SIRINGO, Fabio
1994-01-01
Abstract
In the framework of the bisoliton model we have studied the critical temperature T c, as a function of the pressure P and of the hole concentration δ for the high temperature superconductors YBa2Cu3Ox and (La1-xMx)2CuO4. Our results for δ ln Tc/δ ln V as a function of T c describe quite satisfactorily the general trend of the experimental data. Furthermore we show that in the bisoliton model the energy gap δ (in units of Jg3/3, where J is the nearest-neighbour exchange integral and g is the nonlinearity parameter) is an universal function of δ/g. An analogous property is valid for T c By fitting the maximum value of T c we are able also to reproduce the experimental data for T c(δ).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
