Short Range Order Strucrures in Y-Pr-Ba-Cu-O System Studied by X-Ray Absorption Fine Structure (XAFS) Techniques
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SHORT RANGE ORDER STRUCrURES IN Y-Pr-Ba-Cu-O SYSTEM STUDIED BY X-RAY ABSORPTION FINE STRUCTURE (XAFS) TECHNIQUES
Y.H. KAO*, A. KROL*, Z.H. MING-, C.S. LIN*, Y.L. SOO*, C.X. GU*, I.S. YANG**, AND C.C. TSUEI** *Physics Department, State University of New York at Buffalo, Buffalo, NY 14260 **IBM T.J. Watson Research Center, Yorktown Heights, NY 10598
ABSTRACT
Local structure around the constituent atoms in the compound system Y1.5PrBa2Cu 307. has been investigated by means of x-ray absorption fine structure (XAFS) techniques. By comparing the local structure in the compound x=1 with its counterpart x=0, the XAFS results provide a direct evidence that Pr has replaced Y in the material. The nearest-neighbor structure in the CuO 2 planes seems to remain intact as x varies from 0 to 1, indicating that substitution of Pr for Y does not disturb the local distribution of holes in the CuO 2 planes. We suggest that local disorder and distortions in the second-neighbor bonding configuration could be responsible for suppression of superconductivity with increasing Pr content in the system. It is well known by now that substitution of various rare earth elements for Y in YBa 2Cu 307.y (YBCO) does not suppress superconductivity except for chemical doping with Ce, Pr, and Tb. While there are difficulties to prepare single phase materials of Ce- and Tb-doped YBCO, the solid solution system Yl 5 PrxBa 2Cu 3O7 (YPBCO) with 0
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