Magnetic and Electrical Properties of Ln0.7Ca0.3MnO3(Ln = Nd, Sm, La)

Chon, Gom-Bai; Im, Hung-Su; Lee, Chan-Gyu; Koo, Bon‐Heun; Lee, Sang‐Min; Jung, Myung‐Hwa; Jo, Younghun

doi:10.3740/mrsk.2007.17.4.203

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…The MR values at transition temperature are found to be 86% for pristine sample, 81% for Nd-doped, 96% for Sm-doped, and 94% for Gd-doped samples. The observed values magnetoresistance in the studied materials considerably higher than the reported values of MR in Sm 0.7 Ca 0.3 MnO 3 (22% at 77 K) and Nd 0.7 Ca 0.3 MnO 3 (32% at 110 K) [33]. Our analysis suggests that structural distortion may be the key parameter governing the CMR response.…”

Section: Magnetoresistance (Mr)contrasting

confidence: 59%

Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La_0.67–xRE_xCa_0.33MnO₃ (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution

Pal¹,

Nagaraja²,

Rachana³

et al. 2020

Mater. Res. Express

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We investigated the influence of 10% substitution of rare-earth (RE) elements on the crystallographic, transport, and magnetic properties of La 0.67-x RE x Ca 0.33 MnO 3 (RE=Nd, Sm, and Gd, x=0.0, 0.1) manganite perovskite compounds. The bulk polycrystalline samples were synthesized using solidstate reaction method. The phase purity and crystal structure of studied samples were confirmed by room temperature X-ray diffraction followed by the Rietveld refinement analysis. A high temperature insulator to low temperature metal phase transition is observed in electrical transport measurement. We observed an enhancement in the temperature coefficient of resistance (TCR) and magnetoresistance (MR) by partially substituting La with RE ions. The maximum TCR≈22% and MR≈96% are observed in Gd doped sample. The magnetic transition temperature, T c , decreases from ∼254 K for the pristine sample to about ∼165 K for the Gd-doped sample. Our analysis of electrical and thermal transport data shows that the Small Polaron Hopping (SPH) is predominant at high temperatures conduction mechanism, whereas at low temperatures mechanism is dominated by electron-magnon scattering. The high temperature insulator paramagnetic phase to low temperature metallic ferromagnetic phase transitions are also observed in thermal conductivity and specific heat.

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Section: Magnetoresistance (Mr)contrasting

confidence: 59%

Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La_0.67–xRE_xCa_0.33MnO₃ (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution

Pal¹,

Nagaraja²,

Rachana³

et al. 2020

Mater. Res. Express

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Low-Temperature Small Polaron Hopping Conduction in Bilayer La1.4(Sr0.2Ca1.4)Mn2O7 Ceramics

Jung

2008

Korean. J. Mater. Res.

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The dc resistivity and thermoelectric power of bilayered perovskite La with and without an applied field. At high temperatures, a significant difference between the activation energy deduced from the electrical resistivity and thermoelectric power, a characteristic of small polarons, was observed. All of the experimental data can be feasibly explained on the basis of the small polaron.Key words electron-phonon interaction, hopping, jahn-teller effect, localization, small polaron. 서 론

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Magnetic and Electrical Properties of Ln0.7Ca0.3MnO3(Ln = Nd, Sm, La)

Cited by 2 publications

References 16 publications

Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La_0.67–xRE_xCa_0.33MnO₃ (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution

Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La_0.67–xRE_xCa_0.33MnO₃ (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution

Low-Temperature Small Polaron Hopping Conduction in Bilayer La1.4(Sr0.2Ca1.4)Mn2O7 Ceramics

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Magnetic and Electrical Properties of Ln0.7Ca0.3MnO3(Ln = Nd, Sm, La)

Cited by 2 publications

References 16 publications

Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La0.67–xRExCa0.33MnO3 (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution

Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La0.67–xRExCa0.33MnO3 (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution

Low-Temperature Small Polaron Hopping Conduction in Bilayer La1.4(Sr0.2Ca1.4)Mn2O7 Ceramics

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Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La_0.67–xRE_xCa_0.33MnO₃ (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution

Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La_0.67–xRE_xCa_0.33MnO₃ (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution