Chemical pressure effects of cation size variation in layered manganites

We have investigated the electric and magnetic properties of the layered manganite (La1-yRy)2-2xSr1+2xMn2O7 (R=Pr, Nd, Sm, Eu, Gd; x=0.3) with the fixed doping concentration. The average ionic radius of the La/Sr site rA > is varied by the replacement of the La ion with different rare earth ion....

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2001-08, Vol.70 (8), p.2448-2453
Main Authors: DHO, Joonghoe, KIM, Wan Seop, CHOI, Hong Seok, CHI, Eun Ok, HUR, Nam Hwi
Format: Article
Language:English
Subjects:
Colossal magnetoresistance
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Magnetotransport phenomena, materials for magnetotransport
Physics
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Summary:We have investigated the electric and magnetic properties of the layered manganite (La1-yRy)2-2xSr1+2xMn2O7 (R=Pr, Nd, Sm, Eu, Gd; x=0.3) with the fixed doping concentration. The average ionic radius of the La/Sr site rA > is varied by the replacement of the La ion with different rare earth ion. For rA > ∼ 1.3963 Å, we observed the metal-insulator transition accompanied by the ferromagnetic (FM) ordering near 75 K and subsequently the spin-glass-like transition near 30 K. For rA > ≤ 1.3895 Å, the metallic FM state disappears and instead the non-metallic spin-glass-like phase appears around 30 K. With decreasing rA >, the FM double exchange interaction is weakened and resultantly the antiferromagnetic (AFM) superexchange interaction is developed. These magnetic and transport properties in the layered manganite system are found to be primarily dependent on the size of rA >.
ISSN:0031-9015
1347-4073
DOI:10.1143/JPSJ.70.2448