Chemical pressure effect on magnetic properties in electron-doped perovskite manganites (Gd{sub 0.08}Ca{sub y}Sr{sub 0.92-y})MnO{sub 3} (0<y<1): Percolation transition of ferromagnetic clusters

Journal Article · Wed Sep 01 00:00:00 EDT 2004 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.70.094419· OSTI ID:20664886

Hirano, Shingo; Sugiyama, Jun; Noritake, Tatsuo; Tani, Toshihiko ^[1]

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1. Toyota Central Research and Development Laboratories, Inc., Nagakute, Aichi 480-1192 (Japan)

The magnetic properties of electron-doped perovskite manganites, (Gd{sub x}Ca{sub y}Sr{sub 1-x-y})MnO{sub 3} (x=0.08 and 0.05, 0.1{<=}y<1), were investigated as a function of the average ionic radius of the A-site cations (i.e., Gd, Ca and Sr), <r{sub A}>using polycrystalline samples. For the samples with x=0.08, as y increased from 0, the low temperature phase changed from an antiferromagnetic insulator (AFI) to a ferromagnetic metal (FM) at y{approx}0.35 which corresponds to <r{sub A}>=1.25 A. The magnitude of the Neel temperature was found to correlate with the bandwidth of the Mn-3d band. On the other hand, for the samples with y>0.5, a small saturation magnetization suggested the coexistence of the FM and AFI phase; in other words, magnetic phase separation occurred below the Curie temperature ({approx}120 K). A scaling analysis of the resistivity of (Gd{sub 0.08}Ca{sub y}Sr{sub 0.92-y})MnO{sub 3} indicated that a percolation transition between FM clusters was induced by the decrease in <r{sub A}>.

• OSTI ID: 20664886
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 70, Issue 9; Other Information: DOI: 10.1103/PhysRevB.70.094419; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CALCIUM COMPOUNDS
CATIONS
CURIE POINT
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRONS
FERROMAGNETIC MATERIALS
GADOLINIUM COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIZATION
METALS
NEEL TEMPERATURE
PEROVSKITE
POLYCRYSTALS
STRONTIUM COMPOUNDS
TEMPERATURE RANGE 0065-0273 K