Structural, Thermal, Magnetic, and Transport Properties of (La_{2/3}Ca_{1/3})(Mn_{1-x}Sn_x)O_{3-δ} Compounds

• Authors: J. Przewoźnik , J. Chmist , L. Kolwicz-Chodak , Z. Tarnawski , A. Kołodziejczyk , K. Krop , K. Kellner , G. Gritzner
• Languages of publication: EN

Abstracts

EN

The structural, magnetic, and electrical transport properties of Sn-doped manganite La_{0.67}Ca_{0.33}Mn_{1-x} Sn_xO_{3-δ} (x=0, 0.01, 0.03, andδ≈0.06) compounds were studied using X-ray powder diffraction, scanning electron microscopy, AC susceptometer and vibrating sample magnetometer measurements as well as four-probe resistance measurements. The specific heat was measured by the heat-pulse method. The Curie temperature T_C and the metal-insulator transition temperature T_{M-I} decreased nonlinearly with increasing Sn content. The T_C and T_{M-I} values, for the x=0, 0.01, and 0.03 compounds were separated by 18.2 K, 66.3 K, and 10 K, respectively. The resistivity above T_C for all of these compounds followed the Mott variable-range-hopping model. This allowed the estimation of the localization lengths of 2.2Å (x = 0), 1.33Å (x=0.01) and 1.26Å (x=0.03). The x=0 and x=0.01 compounds exhibited anomalies of R(T) at corresponding T_C and allowed the separation of the magnitude of the purely magnetic contribution to the resistance which for x=0 was≈5 .7Ω and for x=0.01,≈22 .4Ω. The specific heat of the Sn-free sample exhibited a sharp peak at T_C. With increasing Sn content the peak at T_C broadened and the area under the peak decreased. For x= 0.03 the peak was hardly detectable. Our results on La_{0.67}Ca_{0.33} Mn_{1-x}Sn_xO_3 reveal that a small substitution of Sn^{4+} for Mn^{4+} suppresses double exchange interactions and strongly affects the magnetic, thermal, and transport properties of the parent compound.

Keywords

EN

75.47.Lx; 75.47.Gk; 75.40.Cx

Discipline

• 75.47.Gk: Colossal magnetoresistance
• 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
• 75.47.Lx: Magnetic oxides

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 106
• Issue: 5
• Pages: 665-680

Dates

published

2004-11

received

2004-06-06

Contributors

author

J. Przewoźnik

• Faculty of Physics and Nuclear Techniques, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland

author

J. Chmist

• Faculty of Physics and Nuclear Techniques, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland

author

L. Kolwicz-Chodak

• Faculty of Physics and Nuclear Techniques, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland

author

Z. Tarnawski

• Faculty of Physics and Nuclear Techniques, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland

author

A. Kołodziejczyk

• Faculty of Physics and Nuclear Techniques, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland

author

K. Krop

• Faculty of Physics and Nuclear Techniques, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland

author

K. Kellner

• Institut für Chemische Technologie Anorganischer Stoffe, Johannes Kepler Universität Linz, 4040 Linz, Austria

author

G. Gritzner

• Institut für Chemische Technologie Anorganischer Stoffe, Johannes Kepler Universität Linz, 4040 Linz, Austria

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Identifiers

DOI

10.12693/APhysPolA.106.665