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Band filling dependence of the electrical transport of Nd 1-xAxTiO3 ( A = Ca , Sr and Ba)
, A. Poddar, B. Roy
Published in
Volume: 375
Issue: 1-2
Pages: 15 - 23
We are here reporting the results of the studies of X-ray, electrical resistance (R) and thermoelectric power (TEP, S) on Nd1-xA xTiO3 (A = Ca, Sr and Ba) over a wide temperature range as a function of 3d band filling n ( = 1-x). Depending upon the levels of band filling all the compounds studied show both insulating as well as metallic behavior thereby exhibiting a metal-insulator (M-I) transition. The filling level at which M-I occurs varies with the size of the divalent alkaline earth ions A. In the correlated metallic phase resistance data scales well with T 2 suggesting that electron-electron scattering plays a major role governing the conduction mechanism. Analysis of the T-linear part of the TEP measurement reveals that the occurrence of the metal-insulator transition is due to the enhancement of the effective mass of the carriers. © 2003 Elsevier B.V. All rights reserved.
About the journal
JournalJournal of Alloys and Compounds