Tuning of magnetocaloric effect in a La0.69Ca0.31MnO3 single crystal by pressure

Sun, Young; Kamarád, J.; Arnold, Z.; Kou, Zhi-qi; Cheng, Zhao‐Hua

doi:10.1063/1.2183824

Cited by 39 publications

(19 citation statements)

References 17 publications

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“…We might conclude that the agreement is remarkable. The unusual deviation around x ∼ 30% is attributed [43][44][45][46] to differences in the method used in preparing the sample. Interestingly, close to x ∼ 0.50 the ground state changes from F to AF although the direct F → AF metamagnetic transition (if possible) will be restricted to a very narrow interval of values of x.…”

Section: A La (1−x) Ca X Mno 3 Cmr Systemmentioning

confidence: 99%

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Magnetocaloric and barocaloric responses in magnetovolumic systems

Mendive-Tapia

Castán

2015

Phys. Rev. B

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By means of a mean-field model extended to include magnetovolumic effects, we study the effect of external fields on the thermal response characterized either by the isothermal entropy change and/or the adiabatic temperature change. The model includes two different situations induced by the magnetovolumic coupling: (i) a first-order paramagnetic-to-ferromagnetic phase transition that entails a volume change; (ii) an inversion of the effective exchange interaction that promotes the occurrence of an antiferromagnetic phase at low temperatures. In both cases, we study the magnetocaloric and barocaloric effects as well as the corresponding cross-caloric responses. By comparing the present theoretical results with available experimental data for several materials, we conclude that the present thermodynamical model reproduces the general trends associated with the considered caloric and cross-caloric responses.

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Section: A La (1−x) Ca X Mno 3 Cmr Systemmentioning

confidence: 99%

“…In Fig. 10 [44] for different values of the applied magnetic field and for two values of the applied pressure P 0 (ambient pressure) and P = 1.1 GPa. In Fig.…”

Section: A La (1−x) Ca X Mno 3 Cmr Systemmentioning

confidence: 99%

Magnetocaloric and barocaloric responses in magnetovolumic systems

Mendive-Tapia

Castán

2015

Phys. Rev. B

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“…First, the phase transition point is driven up to a higher temperature by the magnetic field, but is depressed to a lower temperature by the pressure, such as LaFe 13-x Si x , [27][28][29][30][31], and MnAs. [3, 6] Second, the phase transition point is promoted to a higher temperature by both magnetic field and pressure, such as Gd 5 Si 4-x Ge x [22,23] and La 0.69 Ca 0.31 MnO 3 [32]. The higher the Curie temperature shifts, the wider the entropy change curve is.…”

Section: Mcementioning

confidence: 99%

Magnetocaloric and barocaloric effects in a Gd ₅ Si ₂ Ge ₂ compound

Zou¹

2012

Chinese Phys. B

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The caloric effect in Gd 5 Si 2 Ge 2 compound is studied experimentally and theoretically. The first-order phase transition is sensitive to both magnetic field and pressure. It indicates that the influences of magnetic field and pressure on the phase transition are virtually equivalent.Moreover, the theoretical analyses reveal that the total entropy change is almost definite at a certain Curie temperature whether the applied external field is magnetic field or pressure. On the basis of theoretical analyses, the entropy change simultaneously induced by magnetic field and hydrostatic pressure can be obtained experimentally. As for Gd 5 Si 2 Ge 2 compound, the entropy change curve is broadened dramatically, and the refrigerant capacity is improved from 284.7 to 447.0 J/kg. Additionally, the required magnetic field in magnetic refrigeration technique may be reduced by the application of hydrostatic pressure.

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“…There are several reasons why a number of investigations are devoted to compounds based on the LaMnO 3 [1][2][3][4][5][6][7][8][9][10]. First, the replacement of La 3 + ion by divalent and/or trivalent cations makes it possible to synthesize a very wide series of solid solutions ðLa 3 1Ày A 3 þ y Þ 1Àx A 2 þ x Mn 3 þ 1Àx Mn 4 þ x O 3 with different relations between the contents of manganese ions of different valency.…”

Section: Introductionmentioning

confidence: 99%