Quantifying phase separation in terms of magnetoresistive hysteresis loops in strongly phase-separated manganite thin films

Singh, Sandeep; Tyagi, Pawan; Singh, H. K.

doi:10.1007/s00339-017-1295-5

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…On one hand, an isothermal evolution of the relative fraction of the coexisting phases can be observed, resembling the rejuvenation process of glassy systems [2,12,13,14,15]. In fact, a direct image of the evolution of the coexisting phases has been recently reported using microwave impedance microscopy [16], and confirming the phase diagrams previously obtained by macroscopic measurements [12,17,18 ], showing that the particular state of PS manganites is strongly dependent on the thermal and magnetic history [12,17,19,20] On the other hand, different systems evolve towards equilibrium by irreversible changes that arise each time the sample is cooled across a transition temperature [21,22,23,24], in close similarity with the phenomenology of the martensitic transitions [25] and shape memory alloys [26]. In this thermal cycling effect, the system evolves from cycle to cycle by a cumulative growth of one phase against the other.…”

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confidence: 79%

Thermal cycling effects on static and dynamic properties of a phase separated manganite

Sacanell

Sievers

Quintero

et al. 2018

Journal of Magnetism and Magnetic Materials

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In this work we address the interplay between two phenomena which are signatures of the out-ofequilibrium state in phase separated manganites: irreversibility against thermal cycling and aging/rejuvenation process. The sample investigated is La 0.5 Ca 0.5 MnO 3 , a prototypical manganite exhibiting phase separation. Two regimes for isothermal relaxation were observed according to the temperature range: for T > 100 K, aging/rejuvenation effects are observed, while for T < 100 K an irreversible aging was found. Our results show that thermal cycles act as a tool to unveil the dynamical behavior of the phase separated state in manganites, revealing the close interplay between static and dynamic properties of phase separated manganites.

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Section: -Introductionsupporting

confidence: 79%

Thermal cycling effects on static and dynamic properties of a phase separated manganite

Sacanell

Sievers

Quintero

et al. 2018

Journal of Magnetism and Magnetic Materials

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Magnetotransport Irreversibility in Single Crystalline La_0.18Pr_0.40Ca_0.42MnO₃ Thin Films

Kumari

Siwach

Maurya

et al. 2019

Physica Status Solidi (b)

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Magnetotransport irreversibility in single crystalline La 0.18 Pr 0.40 Ca 0.42 MnO 3 thin films is probed with respect to intrinsic electronic phase separation (IEPS). Temperature-dependent magnetization and resistivity measurements show that (i) the high temperature non-hysteretic regime is dominated by the antiferromagnetic insulator (AFMI) and the charge ordered (CO) phases; (ii) at intermediate temperatures hysteretic regime is akin to a spin liquid; and (iii) the glass transition occurs at temperature T g below which the spin liquid freezes. The suppression of the ferromagnetic and insulator-metal transitions (T C and T IM ) during cooling confirms supercooled magnetic liquid. Magnetic field-dependent resistivity (ρ-H) measured during cooling and warming highlights the differences in the spin-ordered structures through (i) reversible behavior at T < T g ; (ii) colossal irreversibility in the isothermal cooling and warming ρ-H at T g < T < T C /T IM ; and (iii) reversible ρ-H at low/moderate fields but irreversible behavior at high fields at T > T IM (warming). The present study demonstrates that the scaling of area between the isothermal cooling and warming cycle ρ-H curves with temperature mimics the ρ-T behavior and hence also reflects the insulator-metal transition. The observed irreversibility and the area scaling in the different spin regimes have been explained in terms of the intrinsic electronic phase separation.

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The consequences of growth modes on the magnetotransport properties of La0.4Pr0.3Ca0.3MnO3/LAO films

et al. 2018

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The impact of pulse repetition rate and film thickness on the magnetic, magnetoresistance (MR) and anisotropic magnetoresistance (AMR) has been investigated for La0.4Pr0.3Ca0.3MnO3 thin films grown on LaAlO3 (LAO) substrates by pulsed laser deposition technique. Change in repetition rate led to a difference in growth modes and altered the magnetic and electrical properties (MR and AMR) of thin films. The XRD results show that in the films with the thickness of 100 nm, by increasing the pulse repetition rate from 2 to 7 Hz the strain level doesn’t change, while strain significantly increased at the repetition rate of 10Hz. Analysis of transport and magnetization measurements show that at 2 and 5 Hz deposited films, the ferromagnetic metallic behavior is dominant, while in the film deposited at 10 Hz the antiferromagnetic (AFM) insulating phase increased. Moreover, with increasing strain in the thinner films (40 nm), deposited at 2 Hz, AFM phase is strengthened. Exchange bias confirms the existence of a dead layer in 100 nm film deposited at 10 Hz and 40 nm film deposited at 2 Hz. In addition, high strain in thinner films led to an enhanced Jahn-Teller coupling, so the angular momentum and spin-orbital/lattice interactions are significantly increased, which led to a lower magnetoresistance in thinner films. These results suggest that the pulse repetition rate provides an additional degree of freedom to tune magnetic and electrical properties of manganite thin films prepared by pulsed laser deposition technique.

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Quantifying phase separation in terms of magnetoresistive hysteresis loops in strongly phase-separated manganite thin films

Cited by 3 publications

References 41 publications

Thermal cycling effects on static and dynamic properties of a phase separated manganite

Thermal cycling effects on static and dynamic properties of a phase separated manganite

Magnetotransport Irreversibility in Single Crystalline La_0.18Pr_0.40Ca_0.42MnO₃ Thin Films

The consequences of growth modes on the magnetotransport properties of La0.4Pr0.3Ca0.3MnO3/LAO films

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Quantifying phase separation in terms of magnetoresistive hysteresis loops in strongly phase-separated manganite thin films

Cited by 3 publications

References 41 publications

Thermal cycling effects on static and dynamic properties of a phase separated manganite

Thermal cycling effects on static and dynamic properties of a phase separated manganite

Magnetotransport Irreversibility in Single Crystalline La0.18Pr0.40Ca0.42MnO3 Thin Films

The consequences of growth modes on the magnetotransport properties of La0.4Pr0.3Ca0.3MnO3/LAO films

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Magnetotransport Irreversibility in Single Crystalline La_0.18Pr_0.40Ca_0.42MnO₃ Thin Films