Metastability in the ferrimagnetic–antiferromagnetic phase transition in Co substituted Mn<sub>2</sub>Sb

Kushwaha, Pallavi; Rawat, R.; Chaddah, P.

doi:10.1088/0953-8984/20/02/022204

Cited by 80 publications

(90 citation statements)

References 30 publications

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“…Such an expansion of the hysteresis loop as a function of temperature has been recognized across first-order magnetic transitions in some systems [17,[20][21][22][23] and it may have implications for magnetic phase coexistence phenomenon as discussed in references 22 and 23.…”

Section: IVmentioning

confidence: 97%

Influence of pressure on the magnetic behavior and the anomalous magnetoresistance inTb5Si3

et al. 2009

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The compound, Tb 5 Si 3 , crystallizing in Mn 5 Si 3 -type hexagonal structure, was recently reported by us to exhibit a sudden and huge enhancement in electrical resistivity (ρ) at a critical magnetic field (H cr ) in the magnetically ordered state (< 70 K) tracking isothermal magnetization (M) behavior. We have investigated the influence of external pressure (≤15 kbar) and negative chemical pressure induced by Ge substitution for Si on M and ρ as a function of temperature (5-300 K) and magnetic field (<120 kOe), with the primary aim of understanding the field-induced anomalies. Focusing on isothermal M and magnetoresistance (MR) at two temperatures, 5 and 20 K, we find that this ρ anomaly persists under external as well as negative chemical pressures, however, with a change in the H cr . The pressure-derivative of H cr is negative and this trend and the MR behavior at the H cr are comparable to that observed in some Laves phase itinerant magnetic systems. On the basis of this observation, we speculate that the magnetic fluctuations induced at this critical field could be responsible for the MR anomalies. INTRODUCTION The process of metamagnetism [1], in which a low magnetic moment state of a magnetic material gets transformed to a high magnetic moment state with the application of an external magnetic field (H ext ), continues to attract attention in condensed matter physics. Some phenomena like 'giant magnetoresistance' and the 'giant magnetocaloric effect', which are of great current interest, are closely associated with this process. In particular, for the case of rareearth (R) intermetallics, such a field-induced change in magnetism has been widely reported in the literature. In these local-moment systems, the electrical resistivity (ρ) at the metamagnetic transition usually decreases resulting in negative magnetoresistance, MR [defined as {ρ(H)-ρ(0)}/ρ(0)], due to a reduction in magnetic scattering by the application of magnetic field (H). The reader may see, for instance, Ref. 2 for the behavior of the MR in Gd 5 Si 2 Ge 2 and in DySb following the metamagnetic transition. In contrast to this general behavior, recently we observed [3] an enhanced positive MR at the field-induced magnetic transition in the case of a localmoment system, Tb 5 Si 3 . We considered it important to obtain more experimental results on this compound to understand the origin of such a MR anomaly.At this juncture, it is to be noted that the itinerant systems [4] exhibiting the field-induced magnetic anomalies gained considerable theoretical and experimental interest. In particular, the above mentioned MR anomaly was in fact observed in the cubic Laves phase family, RCo 2 . These binary compounds have been subjected to intense experimental investigations over a period of two decades [5][6][7][8][9]. In these systems, the existence of field-induced transitions and MR anomalies is known to originate from the existence of a peak in the Co 3d density of states in the vicinity of Fermi level. Yamada [7] theoretically predicted that the ...

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Section: IVmentioning

confidence: 97%

Influence of pressure on the magnetic behavior and the anomalous magnetoresistance inTb5Si3

et al. 2009

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“…regions with above-average T* have below-average T K . It is rather intriguing, that such anti-correlation was shown to be universal for all other systems where the 'magnetic glassy' states are identified 10,14,15 . Evidence of the anticorrelation is clear in Fig.…”

Section: B Cooling and Heating In Unequal Fields (Chuf)mentioning

confidence: 99%

Conversion of a glassy antiferromagnetic-insulating phase to an equilibrium ferromagnetic-metallic phase by devitrification and recrystallization in Al substituted Pr_0.5Ca_0.5MnO₃

Banerjee¹,

Kumar²,

Chaddah³

2008

J. Phys.: Condens. Matter

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100

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We show that Pr0.5Ca0.5MnO3 with 2.5% Al substitution and La0.5Ca0.5MnO3 (LCMO) exhibit qualitatively similar and visibly anomalous M-H curves at low temperature. Magnetic field causes a broad first-order but irreversible antiferromagnetic (AF)-insulating (I) to ferromagnetic (FM)-metallic (M) transition in both and gives rise to soft FM state. However, the low temperature equilibrium state of Pr0.5Ca0.5Mn0.975Al0.025O3 (PCMAO) is FM-M whereas that of LCMO is AF-I. In both the systems the respective equilibrium phase coexists with the other phase with contrasting order, which is not in equilibrium, and the cooling field can tune the fractions of the coexisting phases. It is shown earlier that the coexisting FM-M phase behaves like 'magnetic glass' in LCMO. Here we show from specially designed measurement protocols that the AF-I phase of PCMAO has all the characteristics of magnetic glassy states. It devitrifies on heating and also recrystallizes to equilibrium FM-M phase after annealing. This glass-like AF-I phase also shows similar intriguing feature observed in FM-M magnetic glassy state of LCMO that when the starting coexisting fraction of glass is larger, successive annealing results in larger fraction of equilibrium phase. This similarity between two manganite systems with contrasting magnetic orders of respective glassy and equilibrium phases points toward a possible universality.

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“…[26]), Co doped Mn 2 Sb (Ref. [27]), Ru doped CeFe 2 (Ref. [28]) etc and is described to be due to kinetic arrest of the first order magnetic transition.…”

Section: Methodsmentioning

confidence: 99%

First order magneto-structural transition and magnetocaloric effect in MnNiGe0.9Ga0.1

Bag

Nath

2018

Solid State Communications

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-The first order magneto-structural transition (Tt ≃ 95 K) and magnetocaloric effect in MnNiGe0.9Ga0.1 are studied via powder x-ray diffraction and magnetization measurements. Temperature dependent x-ray diffraction measurements reveal that the magneto-structural transition remains incomplete down to 23 K, resulting in a coexistence of antiferromagnetic and ferromagnetic phases at low temperatures. The fraction of the high temperature Ni2In-type hexagonal ferromagnetic and low temperature TiNiSi-type orthorhombic antiferromagnetic phases is estimated to be ∼ 40% and ∼ 60%, respectively at 23 K. The ferromagnetic phase fraction increases with increasing field which is found to be in non-equilibrium state and gives rise to a weak re-entrant transition while warming under field-cooled condition. It shows a large inverse magnetocaloric effect across the magneto-structural transition and a conventional magnetocaloric effect across the second order paramagnetic to ferromagnetic transition. The relative cooling power which characterises the performance of a magnetic refrigerant material is found to be reasonably high compared to the other reported magnetocaloric alloys.Introduction. -Heusler alloys with magnetostructural transition (MST) are receiving increasing attention in current condensed matter physics due to their fundamental and technological relevance. In such materials, manifestation of MST often gives rise to interesting properties such as magnetocaloric effect (MCE) [1,2],magnetoresistance [3,4], field induced shape memory/strain effect [5,6], glass like magnetic states [7,8] etc. In particular, magnetic refrigeration based on the MCE has been thought as a possible alternative for the vapour compression refrigeration technique, though it is far from being possible. Therefore, technological advances demand new and improved materials with MST at elevated temperatures.

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Metastability in the ferrimagnetic–antiferromagnetic phase transition in Co substituted Mn₂Sb

Cited by 80 publications

References 30 publications

Influence of pressure on the magnetic behavior and the anomalous magnetoresistance inTb5Si3

Influence of pressure on the magnetic behavior and the anomalous magnetoresistance inTb5Si3

Conversion of a glassy antiferromagnetic-insulating phase to an equilibrium ferromagnetic-metallic phase by devitrification and recrystallization in Al substituted Pr_0.5Ca_0.5MnO₃

First order magneto-structural transition and magnetocaloric effect in MnNiGe0.9Ga0.1

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Metastability in the ferrimagnetic–antiferromagnetic phase transition in Co substituted Mn2Sb

Cited by 80 publications

References 30 publications

Influence of pressure on the magnetic behavior and the anomalous magnetoresistance inTb5Si3

Influence of pressure on the magnetic behavior and the anomalous magnetoresistance inTb5Si3

Conversion of a glassy antiferromagnetic-insulating phase to an equilibrium ferromagnetic-metallic phase by devitrification and recrystallization in Al substituted Pr0.5Ca0.5MnO3

First order magneto-structural transition and magnetocaloric effect in MnNiGe0.9Ga0.1

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Metastability in the ferrimagnetic–antiferromagnetic phase transition in Co substituted Mn₂Sb

Conversion of a glassy antiferromagnetic-insulating phase to an equilibrium ferromagnetic-metallic phase by devitrification and recrystallization in Al substituted Pr_0.5Ca_0.5MnO₃