Quenched-Disorder-Induced Magnetization Jumps in (Sm,Sr)MnO3

Fisher, L. M.; Kalinov, A. V.; Voloshin, I. F.; Babushkina, N. A.; Khomskii, D. I.; Palstra, T. T. M.

doi:10.1063/1.2355130

Cited by 3 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have investigated magnetocaloric effect in Sm 1-x Sr x MnO 3 series (x = 0.3, 0.4, and 0.5) whose magnetic phase diagram has been studied in detail. 13,14 The low temperature ground state of Sm 1-x Sr x MnO 3 changes from a metallic ferromagnet (0.35 ≤ x < 0.5) to a semiconducting and A-type antiferromagnet for x ≥ 0.5. 15 In the critical composition x = 0.5 where T C = T N (T N -Neel temperature), a long-range charge-orbital ordering also develops below T N. 15 The paramagnetic phase of these Sm based manganites is unusual as suggested by the early work of F. Borges et al 16 who reported a field-induced metamagnetic transition, i.e., a rapid increase of the magnetization above a threshold magnetic field in the paramagnetic state and a large deviation of the inverse susceptibility much above T C .…”

mentioning

confidence: 99%

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

Rebello

Mahendiran

2008

Applied Physics Letters

View full text Add to dashboard Cite

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...

show abstract

mentioning

confidence: 99%

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

Rebello

Mahendiran

2008

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…Anomalous ferromagnetic (FM) transition has also been observed in mixed valance manganites, RE 1−x AE x MnO 3 (RE: rare earth ions, AE: alkaline earth ions) either as a discontinuous transition or a continuous transition with a set of critical exponents that does not belong to any known universality or the weak universality [35][36][37][38][39][40][41][42][43][44][45][46]. The unusual magneto-electronic properties in narrow band manganites are closely associated with the quenched disorder arising mainly due to the size mismatch between A-site cations [47,48].…”

Section: An Alternative Scalingmentioning

confidence: 99%

“…Such disorder reduces the carrier mobility and the formation energy for lattice polarons [49], in effect T C reduces, rendering the FM transition towards first-order. A system with narrow bandwidth and large disorder such as Sm 1−x Sr x MnO 3 shows a sharp first-order FM transition for x = 0.45 − 0.48 [39][40][41][42]. The first-order transition is however extremely sensitive to external pressure, magnetic field, A-/B-site substitution, oxygen isotope exchange, etc.…”

Section: An Alternative Scalingmentioning

confidence: 99%

Continuously Varying Critical Exponents Beyond Weak Universality

Khan

Sarkar

Midya

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Renormalization group theory does not restrict the form of continuous variation of critical exponents which occurs in presence of a marginal operator. However, the continuous variation of critical exponents, observed in different contexts, usually follows a weak universality scenario where some of the exponents (e.g., β, γ, ν) vary keeping others (e.g., δ, η) fixed. Here we report ferromagnetic phase transition in (Sm1−yNdy)0.52Sr0.48MnO3 (0.5 ≤ y ≤ 1) single crystals where all three exponents β, γ, δ vary with Nd concentration y. Such a variation clearly violates both universality and weak universality hypothesis. We propose a new scaling theory that explains the present experimental results, reduces to the weak universality as a special case, and provides a generic route leading to continuous variation of critical exponents and multi-criticality.

show abstract

Effect of Yttrium Doping on Magnetic Properties and Magnetic Entropy Change of Bilayered Perovskite La1.3Sr1.7Mn2O7

Cao

Liu

et al. 2020

J Low Temp Phys

View full text Add to dashboard Cite

Quenched-Disorder-Induced Magnetization Jumps in (Sm,Sr)MnO3

Cited by 3 publications

References 12 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)

Continuously Varying Critical Exponents Beyond Weak Universality

Effect of Yttrium Doping on Magnetic Properties and Magnetic Entropy Change of Bilayered Perovskite La1.3Sr1.7Mn2O7

Contact Info

Product

Resources

About