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Titolo:
MEM ANALYSIS ON ELECTRON-DENSITY DISTRIBUTION OF SUPERCONDUCTORS, PB2SR2Y0.90SR0.10CU3O8, PB2SR2Y1-XCAXCU3O8 (X = 0.25 AND 0.41) AND PB2SR2HO0.64CA0.36CU3O8
Autore:
ONO Y; BUNGO A; NOJI T; KOIKE Y; KAJITANI T;
Indirizzi:
TOHOKU UNIV,DEPT APPL PHYS,GRAD SCH ENGN SENDAI MIYAGI 9808579 JAPAN
Titolo Testata:
Materials transactions, JIM
fascicolo: 5, volume: 39, anno: 1998,
pagine: 562 - 569
SICI:
0916-1821(1998)39:5<562:MAOEDO>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAXIMUM-ENTROPY METHOD; CRYSTAL-STRUCTURE; DIFFRACTION; CHARGE; PB2SR2YCU3O8; LOCALIZATION; TEMPERATURE; INTERGROWTH; MICROSCOPY; FAMILY;
Keywords:
HIGH-T-C SUPERCONDUCTOR; PB(2)SR(2)LN(1-X)CA(X)CU(3)O(8); X-RAY DIFFRACTION; ELECTRON DENSITY DISTRIBUTION; MAXIMUM ENTROPY METHOD (MEM);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
Y. Ono et al., "MEM ANALYSIS ON ELECTRON-DENSITY DISTRIBUTION OF SUPERCONDUCTORS, PB2SR2Y0.90SR0.10CU3O8, PB2SR2Y1-XCAXCU3O8 (X = 0.25 AND 0.41) AND PB2SR2HO0.64CA0.36CU3O8", Materials transactions, JIM, 39(5), 1998, pp. 562-569

Abstract

Detailed crystal structures of high-T-c superconductors Pb2Sr2Y0.90Sr0.10Cu3O8. Pb2Sr2Y1-xCaxCu3O8 (x=0.25 and 0.41) and Pb2Sr2Ho0.64Ca0.36Cu3O8 were successfully determined by means of single crystal X-ray diffraction at room temperature. Space symmetry changes from C2/m (x=0.10 and 0.25) to Cmmm (x=0.36 and 0.41) with increasing divalent cation concentration, x. Their electron density distributions are determined by means of the maximum entropy method (MEM). Two- or four-splitting oxygen peaks clearly appear in the electron density maps of PbO plane, which is consistent with oxygen disorder models introduced to the present structure determination. In the electron density maps of monovalent copper plane, no peak corresponding to excess oxygens was observed at the 1 x 10(3) e/nm(3) contour level. In the vicinities of divalent copper in the conducting plane, some anomalous electron density distribution is represented in the yttrium compounds.

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Documento generato il 19/09/20 alle ore 15:25:29