THE EFFECT OF F-ION VALENCE ON SUPERCONDUCTIVITY IN THE SERIES PB2SR2RCU3O8 (R=CE, PR, TB AND AM)

Authors
SODERHOLM L SKANTHAKUMAR S STAUB U ANTONIO MR WILLIAMS CW
Citation
L. Soderholm et al., THE EFFECT OF F-ION VALENCE ON SUPERCONDUCTIVITY IN THE SERIES PB2SR2RCU3O8 (R=CE, PR, TB AND AM), Journal of alloys and compounds, 250(1-2), 1997, pp. 623-626
Citations number
22
Categorie Soggetti
Chemistry Physical","Metallurgy & Metallurigical Engineering","Material Science
Journal title
Journal of alloys and compounds → ACNP
ISSN journal
09258388
Volume
250
Issue
1-2
Year of publication
1997
Pages
623 - 626
Database
ISI
SICI code
0925-8388(1997)250:1-2<623:TEOFVO>2.0.ZU;2-A
Abstract
The magnetic properties and valences of the rare earth ions are probed in the superconducting series Pb2Sr2R1-xCaxCu3O8 (R=Ce, Pr, Tb and Am ). The R=Pr and Tb samples are superconducting for x approximate to 0. 5 below 61 and 72 K, respectively, whereas the Ce and Am samples could not be made superconducting for any single phase sample, irrespective of x. X-ray absorption near edge spectroscopy (XANES), used to probe the valence of R, reveals that Pr and Tb are trivalent whereas the Ce and Am are tetravalent. This direct correlation of R valence and the o bservation of superconductivity is discussed.