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Effects of Cationic Substitution on the Electronic and Magnetic Properties of Manganocuprate with a Layered Eu3Ba2Mn2Cu2O12Structure

✍ Scribed by Ichiro Matsubara; Noriaki Kida; Ryoji Funahashi; Kazuo Ueno; Hiroshi Ishikawa; Nobuhito Ohno

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
487 KB
Volume
141
Category
Article
ISSN
0022-4596

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✦ Synopsis

Systematic studies on the effect of substitutions on the layered manganocuprate Eu 3 Ba 2 Mn 2 Cu 2 O 12 have been conducted. To introduce holes, we have made substitutions of Ca for Eu and/or Sc for Mn, (Eu 3؊x Ca x )Ba 2 (Mn 2؊y Sc y )Cu 2 O 12 . Single-phase compounds are obtained over a fairly wide range of x and y values for x40.7 ( y ‫؍‬ 0), x40.5 ( y ‫؍‬ 0.5), and x40.1 ( y ‫؍‬ 1.0). The doped holes are received predominantly at the Mn-O site and change the charge of Mn from 3Ψ‰ to 4Ψ‰, and no superconductivity has been obtained for any sample. The electronic ground state of (Eu 3؊x Ca x )Ba 2 (Mn 2؊y Sc y )Cu 2 O 12 is discussed by comparing with that of the three-dimensional perovskite La 1؊x Ca x MnO 3 and K 2 NiF 4 -type La 1؊x Sr 1Ψ‰x MnO 4 compounds. The substitution of Sr for Ba gives rise to a different crystal structure, the Sr 3 Ti 2 O 7 structure.

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