Anomalous Pr ordering and structural analysis for oxygenated tetragonal 1212 compound Pr1.5Ba1.5Cu3O7.2

Authors
Ku, HC Luo, HM Chi, YP Lin, BN Hsu, YY Lee, TJ Shi, JB Kao, HCI
Citation
Hc. Ku et al., Anomalous Pr ordering and structural analysis for oxygenated tetragonal 1212 compound Pr1.5Ba1.5Cu3O7.2, J L TEMP PH, 117(3-4), 1999, pp. 885-889
Citations number
7
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF LOW TEMPERATURE PHYSICS
ISSN journal
00222291 → ACNP
Volume
117
Issue
3-4
Year of publication
1999
Pages
885 - 889
Database
ISI
SICI code
0022-2291(199911)117:3-4<885:APOASA>2.0.ZU;2-Y
Abstract
Magnetic measurement and powder X-ray Rietveld analysis are performed oxyge nated Pr1.5Ba1.5Cu3O7.2 cuprate. This tetragonal compound with lattice para meters a = 0.38916 nm and c = 1.16177 nm is found to form the TlBa2CaCu2O7 1212-type structure when written as Cu[Ba1.5Pr0.5]PrCu2O7.2. Low temperatur e magnetic data indicate that anomalous Pr order temperature T-N(Pr) decrea ses from 18 K for orthorhombic PrBa2Cu3O6.9 to 10.5 K for Pr1.5Ba1.5Cu3O7.2 . The increasing Pr-O bond length with decreasing TN indicates that Pr orde ring is closely correlated with the wave function overlap between Pr-4f orb ital and O-2p(pi) orbital in the CuO2 bi-layers.