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Raman and magnetic susceptibility evidence for a structural transition in (Eu 1.5− x Pr x Ce 0.5 )Sr 2 Cu 2 NbO 10 compounds
Author(s) -
Bennahmias M.,
Radousky H. B.,
Lorenzana H. E.,
Goodwin T. J.,
Shelton R. N.
Publication year - 1999
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199907)30:7<543::aid-jrs415>3.0.co;2-j
Subject(s) - raman spectroscopy , cuprate , magnetic susceptibility , magnetism , superconductivity , condensed matter physics , chemistry , phase transition , doping , nuclear magnetic resonance , crystallography , materials science , physics , optics
Understanding the unique role that Pr hybridization plays in promoting both the suppression of superconductivity and the onset of complex magnetism in high‐ T C cuprates continues to be a dynamic area of research. Complex magnetic behavior is well known to occur in the (Pr 1.5 Ce 0.5 )Sr 2 Cu 2 MO 10 (M = Nb or Ta) compounds. Previously, two temperature‐dependent transitions have been identified through magnetic susceptibility studies for the series of solid solutions (Eu 1.5− x Pr x Ce 0.5 )Sr 2 Cu 2 NbO 10 (0.0 ≤ x ≤ 1.5). In this paper, we present new measurements of the Raman‐active modes and the magnetic susceptibility for these latter compounds. The data indicate a discontinuity in concentration space at a Pr doping level of x = 1.0, that we interpret as the signature of a subtle phase transition. Copyright © 1999 John Wiley & Sons, Ltd.