Observation of the large magnetocaloric effect in an orbital–spin-coupled system MnV<sub>2</sub>O<sub>4</sub>

Luo, X.; Sun, Yan; Hu, Ling; Wang, Bosen; Lu, Wenjian; Zhu, Xuebin; Yang, Zhaorong; Song, Wenhai

doi:10.1088/0953-8984/21/43/436010

Cited by 20 publications

(20 citation statements)

References 33 publications

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“…Here, T 1 and T 2 , where |−∆S| = 1/2|−∆S max |, are considered to be the temperatures of the cold and hot limit reservoirs, respectively. [7][8][9][10]19 For H=50 kOe, T 1 ∼51 K and T 2 ∼94 K and RC ∼167 J kg -1 , which is very close to that of BFO, ∼172 J kg -1 . 10 The refrigeration range (T 1 -T 2 ) of ∼43 K is also close to that of BFO (∼39 K; T 1 ∼103 K, T 2 ∼142 K).…”

Section: -5supporting

confidence: 61%

“…The peak temperature of -∆S max of Mn 1-x Fe x V 2 O 4 is tuned between ∼57 and ∼77 K, 19 while that of Ba 1-x Sr x FeO 3 can be varied between ∼77 K and ∼116 K; as noted, the present system covers the temperature regions for natural gas and cuprates as well as for N 2 . Since the presence or absence of magnetic hysteresis and also some parameters such as T 1 -T 2 were not explicitly reported for Mn 1-x Fe x V 2 O 4 , detailed comparison will be done in the future.…”

Section: -6mentioning

confidence: 58%

“…In 19 its values of -∆S max ∼5-6 J kg -1 K -1 (H=40 kOe, at ∼77 K) are larger by ∼30% than that of Ba 0.8 Sr 0.2 FeO 3 . From the viewpoint of application to magnetic refrigerators, however, the magnitude of -∆S max should better be expressed in the unit of per volume than in the unit of per weight, although the latter unit is widely used.…”

Section: -5mentioning

confidence: 79%

“…Refrigeration below 77K, mainly for the liquefaction of nitrogen, hydrogen and helium, is one of the two desired purposes of magnetic refrigeration, the other being operation at around room temperature. 18 Quite remarkably a rare-earth-free spinel system, Fe-doped MnV 2 O 4 , has very recently been found to show a large entropy change of ∼5.8 J kg -1 K -1 at ∼77 K. 19 The performance of BSFO having lowered working temperatures will be described below.…”

confidence: 99%

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Magnetocaloric effect of Sr-substituted BaFeO3 in the liquid nitrogen and natural gas temperature regions

et al. 2017

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We have investigated the magnetocaloric effect (MCE) of Ba1-xSrxFe4+O3 (x≤0.2), a series of cubic perovskites showing a field-induced transition from helical antiferromagnetism to ferromagnetism. The maximum magnetic entropy change (-ΔSmax) at 50 kOe varies from ∼5.8 J kg-1K-1 (x=0) to ∼4.9 J kg-1K-1 (x=0.2), while the refrigerant capacity remains almost the same at ∼165 J kg-1. Interestingly, the temperature of -ΔSmax decreases from ∼116 K to ∼77 K with increasing x, providing this series of rare-earth-free oxides with potential as a magnetic refrigerant for the liquefaction of nitrogen and natural gas.

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Section: -5supporting

confidence: 61%

Section: -6mentioning

confidence: 58%

Section: -5mentioning

confidence: 79%

confidence: 99%

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Magnetocaloric effect of Sr-substituted BaFeO3 in the liquid nitrogen and natural gas temperature regions

et al. 2017

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“…Transition metal oxide compounds of the spinel AB 2 O 4 type have long been a subject of considerable activity [1], enhanced by the emerging interest in spin frustration and critical point phenomena [2], and most recently by deeper insight into ferrimagnetic [3,4] and ferroelectric [5] structure, orbital ordering [6], magnetocaloric [7] and glassy effects [8]. The essential features of the spinel structure include the oxygen sharing tetrahedrally-coordinated A-sites, and the octahedrally-coordinated B-sites (Fig.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of single crystal spinels in the series FeV2O4, MnV2O
Kismarahardja
¹
,
Brooks
²
,
Zhou
³

et al. 2013
Phys. Rev. B

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We report a comparative investigation of the magnetostrictive and magnetoconductivity effects in the low temperature ferrimagnetic phases of the spinel vanadate structure AV 2 O 4 where A = Fe, Mn, and Co. In temperature and magnetic field exhibit distinctive physical properties in each case. These include the magneto-caloric signatures of magnetization reversal (Fe and Co), separable isotropic and anisotropic magnetostrictive effects (Mn), glass-like dynamics (Co), and evidence in the fielddependent dielectric response for the alteration of the ferrimagnetic spin structure with increasing 2 magnetic field (Fe). These findings can guide future dielectric-and magnetoconductance-based spinel studies with a focus on the low temperature and high magnetic field properties of canted ferrimagnetic spin configurations and orbital-lattice ordering effects. 75.25.+z, 75.50.Gg, 75.80.+q, 71.70 PACS numbers

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Magnetocaloric Materials with Multiple Instabilities

2017

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the cases of H = 0 and H ≠ 0. In the zero field, the entropy exhibits an anomaly at a ferromagnetic (or ferrimagnetic) transition temperature (T C ), where the slope changes. As a magnetic field is applied to the material at around T C , the fluctuation is suppressed and the entropy is reduced. By exploiting this effect and combining several processes to form a thermodynamic cycle, e.g., Brayton cycle (i)→(ii)→(iii)→(iv)→(i), [7] heat can be extracted from the magnetic material to the thermal bath.While there are several prerequisites (e.g., magnetic and thermal hysteresis properties, mechanical stability, etc.) for materials to be applied to magnetic refrigeration, the enhanced magnitude of the magnetocaloric effect is of primary importance. The magnitude of the magnetocaloric effect is usually evaluated as the isothermal entropy change ΔS = S(H, T) -S(H = 0, T), or adiabatic temperature change ΔT, which are illustrated in Figure 1a, for a given magnetic field change ΔH. In many cases, the isothermal entropy change ΔS is adopted to argue the magnetocaloric effect as it is easier to experimentally evaluate than the adiabatic temperature change ΔT. Here, ΔS is calculated from a series of MH curves with a fine temperature interval using the Maxwell relationRecent research on magnetocaloric materials has focused on first-order magnetic transition systems, rather than secondorder ones because of the enhanced magnitude of the magnetocaloric effect in the former class of materials. [1] In second-order transition systems, the entropy value itself is continuous as a function of temperature, and only its temperature derivative is discontinuous, as shown in the upper panel of Figure 1b. Thus, the entropy change -ΔS displays a triangular-like shape with broad tails at both the high-and low-temperature sides. In this case, the maximum value of -ΔS is generally not very large. On the other hand, in the case of the first-order transition, the entropy itself changes discontinuously at the transition temperature, and therefore, the isothermal entropy change -ΔS tends to be large in magnitude for a rather narrow range of temperatures, as illustrated in Figure 1c. At the same time, the temperature profile of -ΔS indicates a rectangular-like shape rather than the triangular shape in the case of the secondorder transition. Based on these arguments, first-order transition systems have more widely been investigated than secondorder transition systems. Representative examples showing the The magnetocaloric effect is a well-known phenomenon where the temperature of a magnetic material varies upon application or removal of a magnetic field. This effect is anticipated to be applied to magnetic refrigeration technology, which is environmentally benign. For practical applications, it is essential to explore and expand the materials horizon of novel magnets that exhibit giant magnetocaloric effects to achieve sufficient cooling efficiency. In this article, several attempts to enhance the magnetocaloric effect are reviewed from the viewpoint...

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Observation of the large magnetocaloric effect in an orbital–spin-coupled system MnV₂O₄

Cited by 20 publications

References 33 publications

Magnetocaloric effect of Sr-substituted BaFeO3 in the liquid nitrogen and natural gas temperature regions

Magnetocaloric effect of Sr-substituted BaFeO3 in the liquid nitrogen and natural gas temperature regions

Dielectric properties of single crystal spinels in the series FeV2O4, MnV2O
Kismarahardja
¹
,
Brooks
²
,
Zhou
³

et al. 2013
Phys. Rev. B

Magnetocaloric Materials with Multiple Instabilities

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Observation of the large magnetocaloric effect in an orbital–spin-coupled system MnV2O4

Cited by 20 publications

References 33 publications

Magnetocaloric effect of Sr-substituted BaFeO3 in the liquid nitrogen and natural gas temperature regions

Magnetocaloric effect of Sr-substituted BaFeO3 in the liquid nitrogen and natural gas temperature regions

Dielectric properties of single crystal spinels in the series FeV2O4, MnV2OKismarahardja1, Brooks2, Zhou3 et al. 2013Phys. Rev. B

Magnetocaloric Materials with Multiple Instabilities

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Observation of the large magnetocaloric effect in an orbital–spin-coupled system MnV₂O₄

Dielectric properties of single crystal spinels in the series FeV2O4, MnV2O
Kismarahardja
¹
,
Brooks
²
,
Zhou
³

et al. 2013
Phys. Rev. B