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

Banerjee, A.; Kumar, Kranti; Chaddah, P.

doi:10.1088/0953-8984/21/2/026002

Cited by 62 publications

(107 citation statements)

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“…2(b)] and S3 [see Fig. 2(d)], although the transition is still incomplete up to 5 T. Such anomalies have been observed in a variety of magnetic materials, and originate from incomplete first-order phase transition caused by kinetic arrest [17,24,40]. One predominant consequence of the kinetic-arrest effect is the coexistence of transformed and untransformed phases at temperatures far below the phase-transition temperature.…”

Section: A Magnetization Measurementsmentioning

confidence: 93%

“…A special magnetic measurement protocol, i.e., cooling and heating in unequal fields ("CHUF") proposed by Banerjee et al [24,40], provides a method to identify the kineticarrest-induced phase coexistence and its metastability. After cooling from 300 to 5 K in 0, 1, and 5 T, respectively, a magnetic field of 1 T was applied and M-T measurements were performed on warming.…”

Section: E Metastability Of the Sdw Phasementioning

confidence: 99%

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Kinetic-arrest-induced phase coexistence and metastability in(Mn,Fe)2(P,Si)

et al. 2016

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Neutron diffraction, Mössbauer spectroscopy, magnetometry, and in-field x-ray diffraction are employed to investigate the magnetoelastic phase transition in hexagonal (Mn,Fe) 2 (P,Si) compounds. (Mn,Fe) 2 (P,Si) compounds undergo for certain compositions a second-order paramagnetic (PM) to a spin-density-wave (SDW) phase transition before further transforming into a ferromagnetic (FM) phase via a first-order phase transition. The SDW-FM transition can be kinetically arrested, causing the coexistence of FM and untransformed SDW phases at low temperatures. Our in-field x-ray diffraction and magnetic relaxation measurements clearly reveal the metastability of the untransformed SDW phase. This unusual magnetic configuration originates from the strong magnetoelastic coupling and the mixed magnetism in hexagonal (Mn,Fe) 2 (P,Si) compounds.

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Section: A Magnetization Measurementsmentioning

confidence: 93%

Section: E Metastability Of the Sdw Phasementioning

confidence: 99%

Kinetic-arrest-induced phase coexistence and metastability in(Mn,Fe)2(P,Si)

et al. 2016

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“…Since magnetic field (H) is known to melt the CO state in this material, we study the effect of pressure (P) at various H. We explore how pressure affects the AFM state, especially in the presence of H. We find, in contrast to the reports on PSMO or NSMO, that pressure favors the FM state. We also find that, in the presence of H, there is an unexpected large effect at very small pressures.The sample used here is the same as used in our earlier studies 14,16,17 . For completeness, we show in The magnetization measurement under external hydrostatic pressure have been carried out using a Cu-Be clamp type cell (easyLab Technologies) with a pressure volume of 1.9 mm diameter and 10 mm length attached in the SQUID magnetometer (M/s Quantum Design).…”

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confidence: 99%

Effect of simultaneous application of magnetic field and pressure on magnetic transitions inLa0.5Ca0.5MnO3

et al. 2010

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We study combined effect of hydrostatic pressure and magnetic field on the magnetization of La0.5Ca0.5MnO3. We do not observe any significant effect of pressure on the paramagnetic to ferromagnetic transition. However, pressure asymmetrically affects the thermal hysteresis across the ferro-antiferromagnetic first-order transition, which has strong field dependence. Though the supercooling (T*) and superheating (T**) temperatures decrease and the value of magnetization at 5K (M5K ) increases with pressure, T* and M5K shows abrupt changes in tiny pressure of 0.68kbar. These anomalies enhance with field. In 7Tesla field, transition to antiferromagnetic phase disappears in 0.68kbar and M5K show significant increase. Thereafter, increase in pressure up to ∼10kbar has no noticeable effect on the magnetization. PACS numbers: .Half doped perovskite manganites with generic formula of R 3+ 0.5 A 2+ 0.5 MnO 3 have shown many interesting manifestation of electron correlation but continued to puzzle the community because of the drastic changes in physical properties arising form internal disorder and/or external stimuli 1-3 . Coexistence of contrasting orders of almost similar energies and their tunablity with various parameters is considered to be responsible for the observed physical properties 4,5 . The pressure-dependent behaviour of manganites close to half-doping, is being studied currently 6,7 . However, these studies have been on samples that are close to, but below, half-doping and accordingly have ferromagnetic (FM) ground-state that is obtained directly from the high-temperature paramagnetic (PM) phase through a first order phase transition. In all these studies it has been observed that pressure favors FM phase, naively consistent with the expected increase in bandwidth, in that the transition temperature (T C ) increases with increasing pressure. The hysteresis associated with the transition is also found to reduce with increasing pressure and the transition is reported to become second order above a critical pressure 6,7 .On the other hand, prototype half doped manganites have charge ordered (CO)-antiferromagnetic (AFM) ground state and the intermediate bandwidth systems show AFM to FM transition followed by FM to PM transition on increasing T. In such half-doped systems, like Pr 0.5 Sr 0.5 MnO 3 (PSMO), Nd 0.5 Sr 0.5 MnO 3 (NSMO) and La 0.5 Ca 0.5 MnO 3 (LCMO), the PM to FM transition is second order, and the FM to AFM transition is first order 3,[8][9][10][11][12][13] . The effect of pressure on the first order FM to AFM transition has been studied through resistivity measurements on . For both these systems, it is shown that in the lower pressure range up to about 20 kbar the FM to AFM transition temperature (T N ) increases with increasing pressure. This indicates that in this pressure range, coulomb interaction is enhanced at the cost of kinetic energy of the double exchange driven charge carriers with the increase in pressure for NSMO and PSMO.In this context, the intermediate bandwidth half doped mangan...

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“…The phase fraction can be tuned continuously from one end to other end by varying the magnetic field within this field window [28]. Results of such measurement in the present sample are shown in figure 4[a], where sample is cooled under the labeled magnetic field (H an ) from 70 K to 1.5 K and magnetic field is then isothermally changed from H an to 2.5 T. From this figure it is evident that for H an >2.5 T resistivity is a function of H an at 1.5 K and 2.5 T, and it remains almost constant with magnetic field reduction from H an to 2.5 T. Whereas, for H an ≤ 2.5 T resistivity curve merges to each other on isothermal increase of magnetic field from H an to 2.5 T. These observations show that the FM phase fraction increases with increase in cooling field and this phase fraction remains invariant on isothermal reduction of magnetic field to 2.5 T at 1.5 K. Which of these states is equilibrium state is verified using CHUF protocol [39]. Under this protocol, sample is cooled in a various magnetic field H an and measurement is carried out during warming in a magnetic field H w .…”

Section: Fig 1[a]mentioning

confidence: 56%

“…This study brings out that the chracteristic of these thermomagnetic irreversibility can be associated with kinetic arrest of disordered broadened first order transition. Apart from demonstrating the tunability of PM-FM phase, the measurements under CHUF (cooling and heating under unequal magnetic field) protocol [39] provide unambiguous evidence of glass like arrested PM phase.…”

Section: Introductionmentioning

confidence: 95%

Evidence of kinetic arrest in Se doped CoS2

Mishra

Rawat

2016

Solid State Communications

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Abstract. A systematic study of thermomagnetic irreversibility CoS 1.76 Se 0.24 has been carried out. Our study shows that the resistivity at low temperature can be tuned by cooling in different magnetic fields and the critical field required for paramagnetic (PM) to ferromagnetic (FM) transition varies non-monotonically with temperature. The field induced PM to FM transition results in giant positive magnetoresistance (MR) of about 160% at 5 K. Measurements under CHUF (cooling and heating in unequal magnetic field) protocol show reentrant transition on warming under higher magnetic field (than that applied during cooling). It indicates that the glass like behaviour in this system can be explained in the framework of the kinetic arrest of first order transition. Among the growing list of diverse system showing glass like arrested magnetic states, the present system is the first example where, kinetic arrest is observed for a disordered (here PM) to ordered (here FM) first order transition.

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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

Cited by 62 publications

References 20 publications

Kinetic-arrest-induced phase coexistence and metastability in(Mn,Fe)2(P,Si)

Kinetic-arrest-induced phase coexistence and metastability in(Mn,Fe)2(P,Si)

Effect of simultaneous application of magnetic field and pressure on magnetic transitions inLa0.5Ca0.5MnO3

Evidence of kinetic arrest in Se doped CoS2

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