VALENCE STATES OF BISMUTH AND THALLIUM IN SUPERCONDUCTING CUPRATES: A Bi–L3 AND Tl–L3 X-RAY ABSORPTION SPECTROSCOPIC STUDY

Author:

VIJAYAKRISHNAN V.1,KULKARNI G. U.1,RAO C. N. R.1

Affiliation:

1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India

Abstract

Based on a Bi – L 3 edge X-ray absorption spectroscopic study of superconducting bismuth cuprates and model Bi compounds, it is shown that Bi is essentially in the 3 + state in the cuprates. Tl – L 3 absorption edge studies a number of thallium cuprate superconductors along with those of model compounds show some evidence for the occupancy of the Tl -6s band, but Tl 3+ is the prepondarant species. Cu K-edge studies of the thallium cuprates show that Cu is essentially in the 2+ state.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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