Martensitic transition and magnetoresistance in a Cu-Al-Mn shape-memory alloy: Influence of ageing

Marcos, Jordi; Planes, Antoni; Mañosa, Lluı́s; Labarta, A.; Hattink, Bart Jan

doi:10.1103/physrevb.66.054428

Cited by 29 publications

(21 citation statements)

References 38 publications

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“…Through this mechanism, the sample tracks its thermal history; this memory has an eminently structural character, displaying features similar to the shape memory effect found in other systems [16].…”

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confidence: 90%

Low temperature irreversibility induced by thermal cycles on two prototypical phase separated manganites

Sacanell¹,

Quintero²,

Curiale³

et al. 2004

Journal of Alloys and Compounds

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We have studied the effect of irreversibility induced by repeated thermal cycles on the electric transport and magnetization of polycrystalline samples of La 0.5 Ca 0.5 MnO 3 and La 0.325 Pr 0.3 Ca 0.375 MnO 3 . An increase of the resistivity and a decrease of the magnetization at different temperature ranges after cycling is obtained in the temperature range between 300 and 30 K. Both compounds are known to exhibit intrinsic submicrometric coexistence of phases and undergo a sequence of phase transitions related to structural changes. Changes induced by thermal cycling can be partially inhibited by applying magnetic field and hydrostatic pressure. Our results suggest that the growth and coexistence of phases with different structures gives rise to microstructural tracks and strain accommodation, producing the observed irreversibility. Irrespective of the actual ground state of each compound, the effect of thermal cycling is towards an increase of the amount of the insulating phase in both compounds.Manganese oxides with perovskite structure and mixed valent Mn exhibit interesting features related to their electric, magnetic and structural properties, the colossal magnetoresistance effect is probably the best known of them.The discovery of phase separation (PS) in some manganites [1], i.e. the intrinsic coexistence of two or more phases with different magnetic and transport properties on a submicrometric scale, provides an interesting scenario to account for some unusual properties. As thoroughly documented in the recent literature [1,2], this mixture is formed by a ferromagnetic (FM) conductive phase (zones in which double exchange coupling between Mn 3+ and Mn 4+ favours delocalization of carriers) and highly insulating charge ordered (CO) and even orbital ordered phases.Among manganites exhibiting macroscopic PS, La 5/8−y Pr y Ca 3/8 MnO 3 [LPCMO(y)] with 0.3 < y < 0.4, has its temperature of charge ordering (T co ) higher than the FM ordering one (T C ) while La 0.5 Ca 0.5 MnO 3 [LCMO] has T C (J. Sacanell).higher than T co .On cooling LPCMO (0.3), nucleation of FM droplets below T C = 200 K occur in a CO host previously developed (T co = 230 K). These clusters grow as the temperature is lowered, and an insulator-metal transition is obtained when the fraction of the FM phase reaches the percolation threshold [2][3][4].On the other hand, when cooling LCMO, CO regions nucleate within a charge delocalized host. This compound shows PS in the whole temperature range below T C ∼ 220 K. [5][6][7][8][9], with three well differentiated PS regimes [7].In previous works we have observed magnetic memory effects in LPCMO (0.3) [10] and in B site doped LCMO [11] induced by external magnetic field H. Recently, by measuring polycrystalline samples of Pr 0.5 Ca 0.5 Mn 1−x M x O 3 , (M: Cr, Co, Al and Ni) with x = 0.03, Mahendiran et al. have shown that the low temperature resistivity increases after performing repeated thermal cycles [12]. In La 0.5 Ca 0.5 MnO 3 , Li et al. have shown a training effect characterized by the re...

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confidence: 90%

Low temperature irreversibility induced by thermal cycles on two prototypical phase separated manganites

Sacanell¹,

Quintero²,

Curiale³

et al. 2004

Journal of Alloys and Compounds

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“…[14] reported MR of Ni 2 MnGe and Ni 2 MnGa films on GaAs(001) to be ≈ 1% at 9 T at 280 K. Non-stoichiometric Cu-Al-Mn shape memory Heusler alloy shows a large negative MR of 7% at 5 T at 10 K, but at 250 K it is only 0.5%. [15] In half-Heusler alloys like NiMnSb and PtMnSb, the reported MR values at 295 K and 8 T are ≈1% and ≈2.5%, respectively and are attributed to the inelastic s-d scattering. [16] The polycrystalline ingots of Ni 2+x Mn 1−x Ga for x = 0, 0.1 and 0.2 were prepared by standard method [11] and have been characterized by x-ray diffraction (XRD), energy dispersive x-ray analysis (EDAX), differential scanning calorimetry (DSC), resistivity, ac magnetic susceptibility, magnetization and photoelectron spectroscopy.…”

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confidence: 99%

Large negative magnetoresistance in a ferromagnetic shape memory alloy: Ni2+xMn1−xGa

Biswas

Rawat

Barman

2005

Applied Physics Letters

145

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5% negative magnetoresistance (MR) at room temperature has been observed in bulk Ni2+xMn1−xGa. This indicates the possibility of using Ni2+xMn1−xGa as magnetic sensors. We have measured MR in the ferromagnetic state for different compositions (x=0–0.2) in the austenitic, premartensitic, and martensitic phases. MR is found to increase with x. While MR for x=0 varies almost linearly in the austenitic and premartensitic phases, in the martensitic phase it shows a cusplike shape. This has been explained by the changes in twin and domain structures in the martensitic phase. In the austenitic phase, which does not have twin structure, MR agrees with theory based on s-d scattering model.

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“…This method provides vs. curves with the same shape as those obtained by directly measuring vs. under continuous heating at different constant values of . However, the latter can yield slightly different values for the transition temperature due to uncontrollable metastability effects occurring during thermal cycling through the [10]. A number of interesting features are seen from Fig.…”

Section: Resultsmentioning

confidence: 97%

Magnetoelasticity and magnetoresistance in Cu-Al-Mn shape-memory alloys

et al. 2001

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Abstract-This paper is aimed at studying the effect of a magnetic field on the martensitic transition of a Cu-Al-Mn shape-memory alloy. The martensitic transition has been studied through resistance measurements under applied magnetic fields ranging from 0 to 50 kOe. Negative magnetoresistance showing an almost linear dependence with the square of the magnetization has been observed. This magnetoresistive effect is associated with the existence of small ferromagnetic Mn-clusters. Its strength and thermal dependence is different in both phases. The martensitic transition temperature is slightly increased and its spread in temperature significantly reduced upon increasing the field. These results show the existence of magnetoelastic coupling, which favors the nucleation of those martensitic variants with the easy magnetization axis aligned with the field.

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Martensitic transition and magnetoresistance in a Cu-Al-Mn shape-memory alloy: Influence of ageing

Cited by 29 publications

References 38 publications

Low temperature irreversibility induced by thermal cycles on two prototypical phase separated manganites

Low temperature irreversibility induced by thermal cycles on two prototypical phase separated manganites

Large negative magnetoresistance in a ferromagnetic shape memory alloy: Ni2+xMn1−xGa

Magnetoelasticity and magnetoresistance in Cu-Al-Mn shape-memory alloys

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