Structure, magnetism and transport of the perovskite manganites Ln {sub 0.5}Ca{sub 0.5}MnO{sub 3} (Ln=Ho, Er, Tm, Yb and Lu)

Journal Article · Thu Dec 15 00:00:00 EST 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.08.033· OSTI ID:20784805

Yoshii, Kenji ^[1]; Abe, Hideki ^[2]; Ikeda, Naoshi ^[3]

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1. Japan Atomic Energy Research Institute, Mikazuki, Hyogo 679-5148 (Japan)
2. National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 (Japan)
3. Japan Synchrotron Radiation Research Institute, Mikazuki, Hyogo 679-5198 (Japan)

It was found that the manganese perovskite oxides Ln {sub 0.5}Ca{sub 0.5}MnO{sub 3} (Ln=Ho, Er, Tm, Yb and Lu) have an orthorhombic structure (space group Pnma). The Mn-O-Mn angles were calculated to be {approx}148-150{sup o}, revealing an existence of a large crystallographic distortion in these oxides. Electrical resistivity measurements indicated both an insulating nature and a small magnetoresistance effect, both of which are owing to narrow bandwidths of the Mn-3d electrons arising from the crystallographic distortion. DC magnetization measurements showed the three characteristic temperatures, which could be assigned to charge-order, antiferromagnetism of Mn moments, and possible glassy states. All of these temperatures were decreased for the heavier Ln ions, which is explained in connection with both a difference of ionic radii of Ln {sup 3+} and Ca{sup 2+}, and a lowering of electron transfer. The charge-ordering transition was not clearly observed only for Lu{sub 0.5}Ca{sub 0.5}MnO{sub 3} containing the smallest lanthanide ion, plausibly due to a large randomness of magnetic interactions arising from the ionic radii difference of Lu{sup 3+} and Ca{sup 2+}. In addition, preliminary measurements of AC dielectric response suggested that these manganites belong to a so-called multiferroic system.

• OSTI ID: 20784805
• Journal Information: Journal of Solid State Chemistry, Vol. 178, Issue 12; Other Information: DOI: 10.1016/j.jssc.2005.08.033; PII: S0022-4596(05)00395-6; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETISM
CALCIUM COMPOUNDS
CALCIUM IONS
CRYSTALLOGRAPHY
DIELECTRIC MATERIALS
ELECTRON TRANSFER
ERBIUM COMPOUNDS
HOLMIUM COMPOUNDS
LUTETIUM COMPOUNDS
LUTETIUM IONS
MAGNETIZATION
MAGNETORESISTANCE
MANGANESE COMPOUNDS
ORTHORHOMBIC LATTICES
OXIDES
PEROVSKITE
TERBIUM COMPOUNDS
YTTERBIUM COMPOUNDS