Large magnetoresistance in (La1−xCaxMnO3)1−y:ZrO2 composite

Das, Debashish; Saha, Atanu; Russek, Stephen E.; Raj, Rishi; Bahadur, D.

doi:10.1063/1.1556260

Cited by 54 publications

(35 citation statements)

References 13 publications

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“…This may be the possible reason for the increasing MR at lower temperatures especially in samples with x = 1/2 and 2/3. The overall MR behavior could be attributed to an intergrain tunneling mechanism [14]. The variation of magnetization (M) with temperature (T) for the series (La x Sm 1-x ) 2/3 Sr 1/3 MnO 3 (x = 1/3, 1/2 and 2/3) in a field of 100 Oe is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Magnetic and magnetotransport properties in (La_xSm_1–x)_2/3Sr_1/3MnO₃ (x = 1/3, 1/2 and 2/3) manganites

Asthana

Nigam

Bahadur³

2006

Physica Status Solidi (b)

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The magnetic and transport properties of (La x Sm 1-x ) 2/3 Sr 1/3 MnO 3 (x = 1/3, 1/2 and 2/3) manganites, prepared by the citrate-gel route, have been investigated. These compounds are found to crystallize in the orthorhombic structure. The hopping between Mn 3+ and Mn 4+ sites is controlled by the Mn -O -Mn bond angle. The magnetoresistance in 8.5 kOe fields varies from 15 to 25 percent over the temperature range 300 K to 80 K. The conduction mechanism can be understood by using the correlated small polaron model. The metal -insulator as well as magnetic transition temperatures are close to each other, which indicates the dominance of long-range ferromagnetic ordering in the present system. At low temperatures, a weak ferromagnetic to antiferromagnetic transition is indicated, which could be due to competing superexchange and double exchange interactions. The charge localization at lower temperatures could be the possible explanation for increasing magnetoresistance. The maximum magnetic moment at 5 K, for all the samples is ∼ 3.6µ B /Mn, which is close to the 3.7µ B /Mn, as obtained by considering the Mn spins only.

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Section: Resultsmentioning

confidence: 99%

Magnetic and magnetotransport properties in (La_xSm_1–x)_2/3Sr_1/3MnO₃ (x = 1/3, 1/2 and 2/3) manganites

Asthana

Nigam

Bahadur³

2006

Physica Status Solidi (b)

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“…Such composites with YSZ attracted a great deal of interest in view of their potential use in SOFC. The Pechini method has recently been used also for the preparation of similar composites containing La-manganite doped with Ba [17] and Ca [18,19]. Sr-doped composites of a similar type are synthesized in [20], but a modified sol-gel process using acetylacetone as a chelating agent (instead of citric acid) is employed.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis of a single-phase product is often difficult and usually the particles of the final product are inhomogeneous in shape and size. Because of this, numerous methods for low-temperature synthesis have been proposed [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Coprecipitation of the metal nitrates solutions with aqueous ammonium carbonate is used in [5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Mn-, La-Mn- and La-Ca-Mn-citrates as precursors for LaMnO3 and La1−xCaxMnO3

Petrova

Todorovsky

Vasileva³

2005

Open Chemistry

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Mn-, LaMn-and LaCaMn-citrates were synthesized at 60-120 • C in ethylene glycol medium using chlorides or nitrates as metal sources. Their composition, IR spectra and thermal decomposition were studied. Equimolar La/Mn ratio has been established in the complex, prepared from chloride solution with the same initial composition of the metals. In the isolated three-metallic complex the molar ratio of the metals deviates from the composition in the initial solution. The final products of the heating of Mn-and mixed-metal LaMn-citrates at 1000 • C are phase-homogeneous Mn 3 O 4 (hausmannite) and LaMnO 3 respectively. Parasitic phase(s) are observed in La x Ca 1−x Mn y O 3 , produced from LaCaMn-citrate.

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“…Another approach is suitable addition of trivalent metal ion. Various studies on the substitution effect on magneto-transport have been reported [4,5]. However, most of them are dedicated to the bulk LCMO.…”

Section: Introductionmentioning

confidence: 98%

Enhancement of ordering temperatures of La_0.67Ca_0.33MnO₃ thin films by adding Ho atoms

Hsu

Hung

Biswas

et al. 2007

Physica Status Solidi (b)

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A series of Ho x -La 0.67 Ca 0.33 MnO 3 thin films with x = 0.0, 0.2, 04, 0.6, and 1.0 mol percent have been deposited on SrTiO 3 (100) substrates with the substrate temperature controlled at 600 o C by dc magnetron sputtering. The magnetic ordering (T c ) and metal-insulator transition temperature (T MI ) were enhanced about 25~60 K for Ho x -La 0.67 Ca 0.33 MnO 3 films. At x = 0.4 the ordering temperature has been increased above 280 K. The variation of the ordering temperature is simply ascribed to the presence of Ho. The results of magnetoresistance measurements indicated that the samples exhibited colossal magnetoresistance effect (CMR) and a maximum was observed at a temperature T P . It was noted that the variation of T P with x displayed the same trend as that of T MI . Although the CMR was suppressed with the addition of Ho, a sizeable CMR ≈ 20 % was still detected at 270 K in the sample with 0.4 mol % Ho due to much higher T P .

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Large magnetoresistance in (La1−xCaxMnO3)1−y:ZrO2 composite

Cited by 54 publications

References 13 publications

Magnetic and magnetotransport properties in (La_xSm_1–x)_2/3Sr_1/3MnO₃ (x = 1/3, 1/2 and 2/3) manganites

Magnetic and magnetotransport properties in (La_xSm_1–x)_2/3Sr_1/3MnO₃ (x = 1/3, 1/2 and 2/3) manganites

Synthesis and characterization of Mn-, La-Mn- and La-Ca-Mn-citrates as precursors for LaMnO3 and La1−xCaxMnO3

Enhancement of ordering temperatures of La_0.67Ca_0.33MnO₃ thin films by adding Ho atoms

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Large magnetoresistance in (La1−xCaxMnO3)1−y:ZrO2 composite

Cited by 54 publications

References 13 publications

Magnetic and magnetotransport properties in (LaxSm1–x)2/3Sr1/3MnO3 (x = 1/3, 1/2 and 2/3) manganites

Magnetic and magnetotransport properties in (LaxSm1–x)2/3Sr1/3MnO3 (x = 1/3, 1/2 and 2/3) manganites

Synthesis and characterization of Mn-, La-Mn- and La-Ca-Mn-citrates as precursors for LaMnO3 and La1−xCaxMnO3

Enhancement of ordering temperatures of La0.67Ca0.33MnO3 thin films by adding Ho atoms

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Magnetic and magnetotransport properties in (La_xSm_1–x)_2/3Sr_1/3MnO₃ (x = 1/3, 1/2 and 2/3) manganites

Magnetic and magnetotransport properties in (La_xSm_1–x)_2/3Sr_1/3MnO₃ (x = 1/3, 1/2 and 2/3) manganites

Enhancement of ordering temperatures of La_0.67Ca_0.33MnO₃ thin films by adding Ho atoms