Large magnetocaloric effect in Sm0.52Sr0.48MnO3 in low magnetic field

Sarkar, P.; Mandal, P.; Choudhury, Pranab

doi:10.1063/1.2919732

Cited by 64 publications

(24 citation statements)

References 25 publications

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“…18 Thus, it seems that the paramagnetic state of x = 0.45 has a mixture of short-range charge ordered regions and nanometer size ferromagnetic clusters. The field-driven metamagnetic transition observed in these mateials 19 can lead to a large change in magnetic entropy (S m ). However, MCE in these materials has not been studied in detail.…”

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confidence: 99%

Composition dependence of magnetocaloric effect in Sm1−xSrxMnO3(x=0.3–0.5)

Rebello

Mahendiran

2008

Applied Physics Letters

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We investigated magnetic and magnetocaloric properties in Sm 1-x Sr x MnO 3 (x = 0.30-0.5). We report a magnetic field driven first-order metamagnetic transition in the paramagnetic state in x = 0.4 and 0.5 and a second-order transition in x = 0.3. The highest magnetic entropy (-S m = 6.2 J/kgK for H = 5 T at T = 125 K) that occurs in x = 0.4 is associated with the metamagnetic transition resulting from the field-induced growth and coalescence of ferromagnetic nano clusters preexisting in the paramagnetic state. Our results suggest that manganites with intrinsic nanoscale phase separation can be exploited for magnetic refrigeration. PACS number(s): 75.47. Lx, 65.40.gd, 75.47.Gk 2 When a material is magnetized by the application of a magnetic field, the entropy associated with the magnetic degree of freedom, S m , decreases. Under adiabatic conditions, the entropy change, S m , must be compensated for by an equal but opposite change in the entropy associated with the lattice, S l , resulting in a change in temperature of the material, T, referred to as the magnetocaloric effect.Magnetic refrigeration based on the magnetocaloric effect is a promising alternative technology to the conventional vapor-compression refrigeration because of its higher energy efficiency and environmental friendliness. 1 The change in magnetic entropy ) and hence MCE is expected to be maximum at the paramagnetic to ferromagnetic transition temperature (T C ). Majority of materials show a second-order paramagnetic to ferromagnetic transition in which magnetic entropy change is moderate. An exception is metallic gadolinium that shows the largest magnetic entropy change (S m = 9.7 J/kg K for   H = 5 T at T C = 293 K) in any elemental ferromagnets near room temperature due to its high moment (S = 7/2). 12In this report, we take an alternative approach to achieve a large MCE by exploiting the nanoscale phase separation found in some narrow band width T at 127 K. The saturation magnetization at 10 K reaches a value of 3.25  B which is slightly lower than 3.6  B expected theoretically. The Arrott plot ( Fig. 2(d)) shows a negative slope at temperature above and near T c which suggests that the field-induced 7 para-ferromagnetic transition is first-order. This satisfies one of the criteria proposed for a material to be a good magnetocaloric material around the Curie temperature. 1The M-H curves and the Arrott plot for x = 0.5 is shown in Fig. 3 (a) and 3(b),respectively. This sample also shows a metamagnetic behavior in the M-H curve between 180 K and 125 K but the transition is rather broad compared to x = 0.4. A ferromagnetic like M-H behavior is observed below 90 K. It is to be noted that the extrapolation of high-field data to the origin, gives M s = 1.88  B which is far below expected theoretical value, 3.5   and this value has not been reached even at the highest field used. The Arrott plot exhibits a negative slope for certain field range above 125 K which suggests the field-induced transition is first order in natur...

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confidence: 99%

Composition dependence of magnetocaloric effect in Sm1−xSrxMnO3(x=0.3–0.5)

Rebello

Mahendiran

2008

Applied Physics Letters

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“…Here we must point out that the film on LAO shows large enhancement in the transition temperature as compared to the polycrystalline/single crystalline bulk (T IM ∼ 130 K) and thin films of similar composition. [9][10][11][12][13][14][15][16][17] However, the abrupt (first order) transition seen in such bulk poly-and single crystalline samples 1, 9, 10 has been transformed into a continuous second order transition in this film. Furthermore, the hysteretic behaviour of the ρ-T measured in heating-cooling cycles is also absent in this film.…”

Section: Resultsmentioning

confidence: 99%

“…This compound is unique due to its proximity to the charge order/orbital order (CO/OO) instability and shows the most abrupt insulator metal transition (IMT) and the most prominent magnetocaloric effect. [9][10][11][12][13][14][15] The ground states of Sm 1-x Sr x MnO 3 are (a) ferromagnetic metallic (FMM) for 0.3 < x ≤ 0.52, and (b) antiferromagnetic insulating (AFMI) for x > 0.52. [9][10][11] The charge ordering (CO) occurs in the range 0.4 ≤ x ≤ 0.6 and the corresponding ordering temperature (T CO ) increases from ∼140 to 205 K with x increasing in the above range.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of magnetic and magnetotransport properties of Sm0.55Sr0.45MnO3 thin films grown on different substrates

et al. 2013

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Highly oriented polycrystalline Sm0.55Sr0.45MnO3 thin films (thickness ∼100 nm) deposited on LaAlO3 (LAO, (001)), SrTiO3 (STO, (001)) and (La0.18Sr0.82) (Al0.59Ta0.41)O3 (LSAT, (001)) single crystal substrates by ultrasonic nebulized spray pyrolysis have been studied. The out of plane lattice parameter (OPLP) of the film on LAO is slightly larger than that of the corresponding bulk. In contrast, the OPLP of the films on STO and LSAT are slightly smaller than the corresponding bulk value. This suggests that the film on LAO is under compressive strain while LSAT and STO are under tensile strain. The films on LAO and LSAT show simultaneous paramagnetic-ferromagnetic (PM–FM) and insulator-metal transition (IMT) temperature at TC/TIM ∼ 165 K and 130 K, respectively. The PM–FM and IM transition occur at TC ∼ 120 K and TIM ∼ 105 K, respectively in the film on STO substrate. At T < TC, the zero field cooled–field cooled (ZFC–FC) magnetization of all the films shows strong bifurcation. This suggests the presence of a metamagnetic state akin to cluster glass formed due to coexisting FM and antiferromagnetic–charge order (AFM–CO) clusters. All the films show colossal magnetoresistance but its temperature and magnetic field dependence are drastically different. The films on LAO and STO show peak CMR around TC/TIM, while the film on LSAT shows MR > 99 % over a very wide temperature range of ∼40 K centred on TC/TIM. In the lower temperature region the magnetic field dependent isothermal resistivity also shows signature of metamagnetic transitions. The observed results have been explained in terms of the variation of the relative fractions of the coexisting FM and AFM–CO phases as a function of the substrate induced strain and oxygen vacancy induced quenched disorder

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“…Sm 1-x Sr x MnO 3 having a poly-and single-crystalline bulk forms have been studied extensively [2][3][4][5][6][7]. Very few reports [8][9][10] exist in literature on single crystalline thin films.…”

Section: Introductionmentioning

confidence: 99%

“…Near half doping (0.45x0.52), very sharp (first order) transitions from paramagnetic insulating (PMI) to the FMM state are observed. Such abrupt first order PMI-FMM transition is one of the prerequisites of a material having large magnetocaloric effect (MCE) and hence is of technological interest [4,5]. Multiplicity of magnetic phases at x=0.45-0.52 provides natural tendencies towards phase separation/coexistence that make the x-T phase diagram fragile vis-a-vis external perturbations.…”

Section: Introductionmentioning

confidence: 99%

Impact of substrate on magnetic phase coexistence in bicritical Sm0.53Sr0.47MnO3 thin films

Srivastava

Singh

Siwach

et al. 2012

Solid State Communications

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Sm 0.53 Sr 0.47 MnO 3 thin films were deposited on single crystal LaAlO 3 (LAO/(001)) and SrTiO 3 (STO/(001)) substrates by DC magnetron sputtering. The -2 and -2 scans show that these films have very good crystallinity and the films on LAO and STO are under compressive and tensile strain, respectively. The films on LAO and STO substrates show ferromagnetic (insulator-metal) transition at T C~1 26 K (at T IM~1 28 K) and 120 K (T IM~1 17K), respectively.The magnetic state at T

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Large magnetocaloric effect in Sm0.52Sr0.48MnO3 in low magnetic field

Cited by 64 publications

References 25 publications

Composition dependence of magnetocaloric effect in Sm1−xSrxMnO3(x=0.3–0.5)

Composition dependence of magnetocaloric effect in Sm1−xSrxMnO3(x=0.3–0.5)

Comparative study of magnetic and magnetotransport properties of Sm0.55Sr0.45MnO3 thin films grown on different substrates

Impact of substrate on magnetic phase coexistence in bicritical Sm0.53Sr0.47MnO3 thin films

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