Magnetic versus orbital polarons in colossal magnetoresistance manganites

Teresa, J. M. De; Ibarra, M. R.; Algarabel, P. A.; Morellón, L.; García‐Landa, B.; Marquina, C.; Ritter, C.; Maignan, A.; Martin, C.; Raveau, B.; Курбаков, А. И.; Trounov, V.

doi:10.1103/physrevb.65.100403

Cited by 95 publications

(101 citation statements)

References 24 publications

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“…In addition, the whole concentration range has been studied only in Ref. [2], while in the rest of the papers a few compositions only (mainly from the ferromagnetic region 0.3 ≤ x ≤ 0.45) have been investigated [3][4][5][6]. In the present work, we report on the magnetic and electrical properties of Sm 1-x Sr x MnO 3 single crystals in a wide concentration range of 0 ≤ x ≤ 0.8.…”

Section: Introduction Substitution Of Lamentioning

confidence: 94%

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Phase transitions in Sm_1–xSr_xMnO₃ single crystals (0 ≤ x ≤ 0.8)

Ivanov

Mukhin

Prokhorov

et al. 2003

Physica Status Solidi (b)

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Magnetic and electrical properties of Sm 1-x Sr x MnO 3 (0 ≤ x ≤ 0.8) single crystals have been studied and the T -x phase diagram has been revised. The compensation points of spontaneous weak ferromagnetic moment have been observed for pure SmMnO 3 and for low doped compositions (0 ≤ x < 0.05). For 0.4 ≤ x ≤ 0.475 the ferromagnetic ordering occurs as a first-order phase transition. It is shown that in a magnetic field the temperature of this transition increases and the transition becomes broader, which results in the appearance of a critical point (T cr ≈ 193 K, H cr ≈ 68 kOe for x = 0.45). Another transition, accompanied by a reduction of magnetization and noticeable anisotropy of magnetization curves, has been observed at low temperature T s ≈ 40 K. Below the Neel temperature, a pure antiferromagnetic state without spontaneous magnetization has been observed for 0.5 ≤ x ≤ 0.575, while for 0.6 ≤ x ≤ 0.675 an additional lowtemperature transition to a new phase with a non-zero weak-ferromagnetic moment has been found.

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Section: Introduction Substitution Of Lamentioning

confidence: 94%

“…Up to now the Sm 1-x Sr x MnO 3 system has not been studied extensively. Firstly, all previous studies to the best of our knowledge have been carried out on polycrystalline samples [2][3][4][5][6]. In addition, the whole concentration range has been studied only in Ref.…”

Section: Introduction Substitution Of Lamentioning

confidence: 99%

Phase transitions in Sm_1–xSr_xMnO₃ single crystals (0 ≤ x ≤ 0.8)

Ivanov

Mukhin

Prokhorov

et al. 2003

Physica Status Solidi (b)

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“…The other possible explanation is based on percolative mechanism of the phase separation as composition Sm0.5SSr0.4SMn03 is on the boundary between the Charge Ordered/Orbital Ordered state and ferromagnetic metallic state [17,31]. In phase separated Sm0.5SSr0.4SMn03, the metallic ferromagnetic clusters are embedded in an insulating matrix.…”

Section: Resultsmentioning

confidence: 99%

Colossal electroresistance in Sm0.55Sr0.45MnO3

Mohan

Kumar

Singh

et al. 2010

Journal of Alloys and Compounds

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We report a colossal resistance drop around insulator-metal transition temperature (TMI) in Sm0.5SSr0.4SMn03 induced by direct current. Polycrystalline samples of Sm0.5SSr0.4SMn03 were synthesized through solid state reaction method, They have been investigated by X-ray diffraction for phase evaluation, scanning electron microscopy for grain morphology and de resistivity measurement techniques for resistivity-temperature behavior. The resistivity-temperature behavior has been measured with different biasing currents (1 rnA, 2.5 rnA,S rnA, lOrnA and 50 rnA), With increasing biasing current, the resistivity of the samples decreased drastically, The change in the resistivity of the samples for bias currents 1 rnA and 50 rnA at TMI was found to be~2560%, This phenomenon of electroresistance is discussed in view of strong interaction between carrier spins and localized spins in Mn ions and percolative mechanism of phase-separation.

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“…Several papers have commented on the missing entropy in manganites for example from localization of carriers at the ferromagnetic metal to paramagnetic insulator transition [36], or phase coexistence [36] or distributed transition due to the very specific dynamic Jahn Teller interaction that is thought to be present in these systems [37]. The entropy change simply assuming a local moment model of independent Mn spins can be estimated from ∆S mn = Rln (2S+1) where R is the gas constant and S is the spin state of the Mn ions.…”

Section: Discussionmentioning

confidence: 99%

Origin of Hysteresis in La_0.67Ca_0.33MnO₃

Morrison¹,

Berenov²,

Cohen³

2011

MRS Proc.

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Hysteresis is unattractive for magnetocaloric applications because it introduces loss in the cooling cycle. It is however usually associated with a first order transition and large entropy change. In this paper we review the sources of hysteresis in magnetocaloric materials and in particular in manganite systems where the nature of the transition in terms of whether it is indeed a first order transition remains elusive.

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Magnetic versus orbital polarons in colossal magnetoresistance manganites

Cited by 95 publications

References 24 publications

Phase transitions in Sm_1–xSr_xMnO₃ single crystals (0 ≤ x ≤ 0.8)

Phase transitions in Sm_1–xSr_xMnO₃ single crystals (0 ≤ x ≤ 0.8)

Colossal electroresistance in Sm0.55Sr0.45MnO3

Origin of Hysteresis in La_0.67Ca_0.33MnO₃

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Magnetic versus orbital polarons in colossal magnetoresistance manganites

Cited by 95 publications

References 24 publications

Phase transitions in Sm1–xSrxMnO3 single crystals (0 ≤ x ≤ 0.8)

Phase transitions in Sm1–xSrxMnO3 single crystals (0 ≤ x ≤ 0.8)

Colossal electroresistance in Sm0.55Sr0.45MnO3

Origin of Hysteresis in La0.67Ca0.33MnO3

Contact Info

Product

Resources

About

Phase transitions in Sm_1–xSr_xMnO₃ single crystals (0 ≤ x ≤ 0.8)

Phase transitions in Sm_1–xSr_xMnO₃ single crystals (0 ≤ x ≤ 0.8)

Origin of Hysteresis in La_0.67Ca_0.33MnO₃