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Title: 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

Abstract

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}>.

Authors:
; ; ;  [1]
  1. Toyota Central Research and Development Laboratories, Inc., Nagakute, Aichi 480-1192 (Japan)
Publication Date:
OSTI Identifier:
20664886
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 70; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevB.70.094419; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Hirano, Shingo, Sugiyama, Jun, Noritake, Tatsuo, and Tani, Toshihiko. 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. United States: N. p., 2004. Web. doi:10.1103/PhysRevB.70.094419.
Hirano, Shingo, Sugiyama, Jun, Noritake, Tatsuo, & Tani, Toshihiko. 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. United States. https://doi.org/10.1103/PhysRevB.70.094419
Hirano, Shingo, Sugiyama, Jun, Noritake, Tatsuo, and Tani, Toshihiko. Wed . "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". United States. https://doi.org/10.1103/PhysRevB.70.094419.
@article{osti_20664886,
title = {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},
author = {Hirano, Shingo and Sugiyama, Jun and Noritake, Tatsuo and Tani, Toshihiko},
abstractNote = {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}>.},
doi = {10.1103/PhysRevB.70.094419},
url = {https://www.osti.gov/biblio/20664886}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 9,
volume = 70,
place = {United States},
year = {2004},
month = {9}
}