We demonstrate that the resistivity data of a number of high-Tc cuprates, in particular La2-xSrxCuO4, are consistent with resistivity saturation, although the Ioffe-Regel condition is strongly violated. By using the f-sum rule together with calculations of the kinetic energy in the t-J model, we show that the saturation resistivity is unusually large. This is related to the strong reduction of the kinetic energy due to strong correlation effects. The fulfilment of the Ioffe-Regel condition for conventional transition metal compounds is found to be somewhat accidental.
Violation of Ioffe-Regel condition but saturation of resistivity of the high-Tc cuprates / Calandra, M.; Gunnarsson, O.. - In: EUROPHYSICS LETTERS. - ISSN 1286-4854. - 61:1(2003), pp. 88-94. [10.1209/epl/i2003-00253-5]
Violation of Ioffe-Regel condition but saturation of resistivity of the high-Tc cuprates
Calandra M.;
2003-01-01
Abstract
We demonstrate that the resistivity data of a number of high-Tc cuprates, in particular La2-xSrxCuO4, are consistent with resistivity saturation, although the Ioffe-Regel condition is strongly violated. By using the f-sum rule together with calculations of the kinetic energy in the t-J model, we show that the saturation resistivity is unusually large. This is related to the strong reduction of the kinetic energy due to strong correlation effects. The fulfilment of the Ioffe-Regel condition for conventional transition metal compounds is found to be somewhat accidental.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione