Staircase effect in metamagnetic transitions of charge and orbitally ordered manganites

Hardy, V.; Hébert, S.; Maignan, A.; Martin, C.; Hervieu, M.; Raveau, B.

doi:10.1016/s0304-8853(03)00201-4

Cited by 90 publications

(95 citation statements)

References 28 publications

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“…These observations are also identical to the behavior of phase-separated manganites and Gd 5 Ge 4 . 11,15,17,20 In the case of manganites, the different crystal structures of the FM and AFM phases in the phase-separated state is responsible for the sweep rate dependence. The sweep rate dependence of the step behavior is a signature of martensitic strains in the system.…”

Section: Resultsmentioning

confidence: 99%

“…[14][15][16][17][18][19][20] Among the intermetallics, Gd 5 Ge 4 is known to show many similarities with the oxides. 11,23 Though there are several factors thought to be responsible for the multistep behavior, the most striking and accepted reason common to the oxide materials and the intermetallics seems to be the martensitic transition driven by the applied field.…”

Section: Discussionmentioning

confidence: 99%

“…11 Interestingly, single-step and multistep magnetization behaviors are observed in some mixed-valent manganites showing colossal magnetoresistance ͑CMR͒, even in polycrystalline form. [12][13][14][15][16][17][18][19][20] Basically, these materials are phaseseparated systems, and the transformation between the two phases has a martensitic character. In addition to the AFM-FM transition, it has been found that the breakdown of charge and orbital ordering also leads to the magnetization jumps in the case of manganites, in general.…”

Section: Introductionmentioning

confidence: 99%

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Magnetism in gallium-dopedCeFe2: Martensitic scenario

2008

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Ce͑Fe 1−x Ga x ͒ 2 compounds with x = 0, 0.01, 0.025, and 0.05 have been investigated to unravel the effect of Ga on the magnetic state of CeFe 2 . We find that the dynamic antiferromagnetic phase present in CeFe 2 gets stabilized with Ga substitution. The hysteresis loops show that while the compounds with x = 0 and 0.01 show normal ferromagnetic behavior, the other two show sharp multiple magnetization steps across the antiferromagnetic-ferromagnetic transition region. Temperature and time dependences of magnetization show that the compounds with x Ն 0.025 possess glassy behavior at low temperatures. The experimental findings clearly establish the fact that among the intermetallics, the Ga-doped CeFe 2 shows the closest resemblance with the martensitic scenario seen in the phase-separated magnetic oxides.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetism in gallium-dopedCeFe2: Martensitic scenario

2008

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“…Two small samples were cut out from the crystal in order to perform the different measurements: a cube of about 10 mm 3 for the magnetization and transport measurements, and a parallelepiped of about 40 mm 3 for the SANS measurements. Prior to characterizations, the purity of the sample was checked by energy dispersive spectroscopy, X-ray, electron and neutron diffraction.…”

Section: Methodsmentioning

confidence: 99%

Small-angle neutron scattering study of the steplike magnetic transformation inPr0.70Ca0.30MnO3

et al. 2007

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Small angle neutron scattering (SANS) magnetic and electrical transport measurements were performed to study a single crystal of Pr 0.7 Ca 0.3 MnO 3 , a colossal magnetoresistive (CMR) material. While the magnetic field induced transformation of this phase separated compound consisting of an antiferromagnetic insulating phase (AFI) and a ferromagnetic insulating phase (FI), is continuous at high temperature (above 5K), at lower temperature a step like transformation is observed (around 5T at 2K). Macroscopic magnetization measurements and SANS indicate that this transformation occurs by the formation of mesoscopic ferromagnetic metallic (FM) domains in the AFI phase, and, eventually, in the FI phase. Although above 5K this transformation is continuous, below 5K a magnetization step marks the abrupt transition from a large scale FI/AFI phase separation to a large scale phase separation between AFI, FI and FM phases. Our results suggest that relaxation of elastic strains inherent to the coexistence of these different phases plays a crucial role in the mechanism of these transformations. The occurrence of magnetization steps could result from an intrinsic behavior of the AFI phase at low temperature.

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“…The present features could also correspond to the pseudo CE-type AFM to FM transition. 23 In the disordered (due to size reduction) manganites, the slight mismatch in the unit cell parameters of competing FMM and AFI-CO phases generates a notable strain at the interface regions, creating a situation similar as for the strain accommodation observed in classical Martensite phase transition, 24 which may explain the current behaviour.…”

Section: B Pulse Field Magnetic Propertiesmentioning

confidence: 91%

Martensite-like transition and spin-glass behavior in nanocrystalline Pr0.5Ca0.5MnO3

et al. 2011

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We report on isothermal pulsed (20 ms) field magnetization, temperature dependent AC – susceptibility, and the static low magnetic field measurements carried out on 10 nm sized Pr0.5Ca0.5MnO3 nanoparticles (PCMO10). The saturation field for the magnetization of PCMO10 (∼ 250 kOe) is found to be reduced in comparison with that of bulk PCMO (∼300 kOe). With increasing temperature, the critical magnetic field required to ‘melt’ the residual charge-ordered phase decays exponentially while the field transition range broadens, which is indicative of a Martensite-like transition. The AC - susceptibility data indicate the presence of a frequency-dependent freezing temperature, satisfying the conventional Vogel-Fulcher and power laws, pointing to the existence of a spin-glass-like disordered magnetic phase. The present results lead to a better understanding of manganite physics and might prove helpful for practical applications

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Staircase effect in metamagnetic transitions of charge and orbitally ordered manganites

Cited by 90 publications

References 28 publications

Magnetism in gallium-dopedCeFe2: Martensitic scenario

Magnetism in gallium-dopedCeFe2: Martensitic scenario

Small-angle neutron scattering study of the steplike magnetic transformation inPr0.70Ca0.30MnO3

Martensite-like transition and spin-glass behavior in nanocrystalline Pr0.5Ca0.5MnO3

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