Specific heat of Nd(1−x)SrxMnO3

Gordon, J. E.; Fisher, Robert A.; Jia, Yunpeng; Phillips, N. E.; Reklis, S. F.; Wright, D. A.; Zettl, Alex

doi:10.1016/s0304-8853(97)00305-3

Cited by 27 publications

(21 citation statements)

References 6 publications

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“…The continuous lines in figure 2 represent the best fit to the experimental data of the following expression: 7,8,9,10 . Since all these samples are insulators at low temperatures, the contribution to the γ-term from free electrons is expected to be zero.…”

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confidence: 99%

Study of magnetic and specific heat measurements at low temperatures in Nd0.5Sr0.5MnO3, Nd0.5Ca0.5MnO3

López¹,

Lisboa‐Filho²,

Lima³

et al. 2002

Journal of Magnetism and Magnetic Materials

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The magnetization at low temperatures for Nd 0.5 Sr 0.5 MnO 3 and Nd 0.5 Ca 0.5 MnO 3 samples showed a rapid increase with decreasing temperatures, contrary to a La 0.5 Ca 0.5 MnO 3 sample. Specific heat measurement at low temperatures showed a Schottky-like anomaly for the first two samples. However, there is not a straight forward correlation between the intrinsic magnetic moment of the Nd 3+ ions and the Schottky-like anomaly.

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mentioning

confidence: 99%

Study of magnetic and specific heat measurements at low temperatures in Nd0.5Sr0.5MnO3, Nd0.5Ca0.5MnO3

López¹,

Lisboa‐Filho²,

Lima³

et al. 2002

Journal of Magnetism and Magnetic Materials

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“…Nd 3+ ionic doping's faint magnetic inhomogeneity is taken to be covered in the double-exchange strong Fig. 6 H/M vs. M 2 plots of isotherms around Curie temperature, the big inset clearly shows that the slope of isotherm plots changes from negative sign to positive sign for temperatures 300-340 K, the small inset shows that the slope of isotherm plots have unaltered positive sign for temperatures 230-280 K magnetic signal, so that the magnetocaloric effect from it is enshrouded in the maximum of magnetic entropy change [33,34].…”

Section: Resultsmentioning

confidence: 99%

Magnetocaloric Effect in Perovskite Manganite La0.65Nd0.05Ba0.3MnO3 with Double Metal–Insulator Peaks

Wang

Che

2011

J Supercond Nov Magn

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With Nd 3+ ionic doping, series of perovskite manganites La 0.7−x Nd x Ba 0.3 MnO 3 (x = 0, 0.05, 0.1) were prepared by the sol-gel technique. The magnetocaloric correlative measurement of La 0.65 Nd 0.05 Ba 0.3 MnO 3 was representatively carried out. Double metal-insulator peaks being found on the resistivity-temperature curves of samples, the maximum of magnetic entropy change was found to be S H = −1.3 J/kg K and its refrigerant capacity 52 J/kg, obtained in the vicinity of room temperature under the variation of 1 T magnetic field. The comparative faint Nd 3+ magnetic inhomogeneity submerged in the double-exchange strong magnetic signal along with the differential coefficient of the magnetic moment with temperature, in the physical definition of the magnetic entropy change, resulting in a single peak on the magnetic entropy change curve.

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“…The contributions of Nd spin system to the entropy are introduced in this perovskite manganite material system with two spin systems. In addition, the interactions between the Mn and Nd spin systems may have some effects on the entropy; the abovementioned factors lead to additional magnetic entropy change and favor magnetocaloric effect [27,28]. Table 1).…”

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confidence: 99%

The influence of disorder on magnetocaloric effect and the order of transition in ferromagnetic manganite (La1−x Nd x )2/3(Ca1−y Sr y )1/3MnO3

2014

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Magnetocaloric effect and order of transition in (La 1-x Nd x ) 2/3 (Ca 1-y Sr y ) 1/3 MnO 3 , prepared by conventional solid-state reaction, have been investigated. Using Banerjee criterion, we demonstrate first-order transition for (J1) and (J2) as well as second-order transition for (J3), (J4), and (J5) samples. The DS M max is ranging between 9.18 Jkg -1 K -1 and 4.87 when Nd and Sr content changes leading to relative cooling power (RCP) varying between 330 and 229.35 J/kg. Both DS M max and the RCP are found sensitive to the disorder r 2 . The universal behavior obtained from DS variation curves confirmed the first-order transition for (J1) and (J2) samples and second-order transition for (J3), (J4), and (J5) samples obtained by Banerjee criterion. All samples with second-order phase transition exhibit inhomogeneous character estimated from local exponent n.

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Specific heat of Nd(1−x)SrxMnO3

Cited by 27 publications

References 6 publications

Study of magnetic and specific heat measurements at low temperatures in Nd0.5Sr0.5MnO3, Nd0.5Ca0.5MnO3

Study of magnetic and specific heat measurements at low temperatures in Nd0.5Sr0.5MnO3, Nd0.5Ca0.5MnO3

Magnetocaloric Effect in Perovskite Manganite La0.65Nd0.05Ba0.3MnO3 with Double Metal–Insulator Peaks

The influence of disorder on magnetocaloric effect and the order of transition in ferromagnetic manganite (La1−x Nd x )2/3(Ca1−y Sr y )1/3MnO3

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