Accession Number : ADA331153

Title :   Modification of High Tc Superconductors by Ion Implantation.

Descriptive Note : Final rept. 30 Jun 94-29 Sep 97,

Corporate Author : STANFORD UNIV CA BOARD OF TRUSTEES

Personal Author(s) : Geballe, T. H.

PDF Url : ADA331153

Report Date : OCT 1997

Pagination or Media Count : 4

Abstract : The transport properties of La-Ca manganites with the perovskite structure have been investigated over a wide range of temperatures above room temperature, and over the whole La-Ca concentration range. They can be understood in terms of a model proposed by Emin and Lolstein in which the charge carriers are small polarons diffusing by adiabatic hops. For the first time it has been demonstrated that polaron hopping in the presence of strong on-site coulomb interaction results in Mott-Hubbard insulating behavior.

Descriptors :   *CHARGE CARRIERS, *ION IMPLANTATION, SUPERCONDUCTORS, CRITICAL TEMPERATURE, PEROVSKITES, MANGANATES.

Subject Categories : Geology, Geochemistry and Mineralogy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE