The normal-state transport properties of Fe and Ga doped La-Sr-Cu-O samples have been investigated by means of resistivity and thermoelectric power measurements. Fe and Ga dopings have a similar influence on the resistivity, i.e., the residual resistivity and MI transition temperature increase gradually with the increase of dopant. However, for their TEP results there exists a great difference. Fe doping leads to the broad peak in S-T curves shifting up to high temperature, while for the Ga doped system, the location of the peaks is nearly unchanged, similar to that of the Zn doped LSCO system. The results are accounted for in terms of the vibronic coupling of electrons to optical-mode lattice vibrations. The structure factor as another possible reason influencing TEP is also discussed in the paper.
|Original language||English (US)|
|Number of pages||7|
|Journal||Physics Letters, Section A: General, Atomic and Solid State Physics|
|State||Published - Nov 23 1998|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)