151Eu Mössbauer studies on La0.5Eu0.17Ca0.33MnO3 CMR system

Reddy, T. Goverdhan; Gupta, Ajay; Reddy, K. Kondal

doi:10.1016/j.physleta.2007.06.061

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…Electrical transport measurements in low magnetic fields show the melting of spin polarons with the increase in the magnetic field [19]. The 151 Eu Mossbauer studies in La 0.67−x Eu x Ca 0.33 MnO 3 suggest local structural re-ordering at phase transition boundaries supporting the intricate relation between the lattice, charge and spin degrees of freedom [10,20]. In many recent studies, a resistivity minimum was observed in manganites, no matter whether polycrystalline, quality film or single crystal, which is similar to the Kondo effect [21][22][23].…”

Section: Introductionmentioning

confidence: 87%

“…The orthorhombic CMR manganite systems show increased JT interaction in the paramagnetic (PM) phase above T C and there is a significant reduction in JT distortion upon entering the ferromagnetic (FM) metallic phase, resulting in the enhanced CMR and lattice anomaly in the orthorhombic systems. The local lattice re-organization is observed through various studies such as Eu 151 Mossbauer studies in Eu doped La 0.67 Ca 0.33 MnO 3 (LCMO) systems [10], EXAFs [11], muon relaxation studies [12] and neutron studies [13]. However, there is limited knowledge on how these charge, lattice and spin degrees of freedom interact in these materials.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic field-induced transitions in La_0.42Eu_0.25Ca_0.33MnO₃perovskite manganite

Turpu¹,

Gupta²,

Reddy³

2009

J. Phys. D: Appl. Phys.

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Electrical and magnetic transport properties of polycrystalline La0.42Eu0.25Ca0.33MnO3 manganite perovskite are reported here. Temperature dependence of electrical transport, in 0 and 0.6 T external magnetic fields, shows insulating behaviour down to the lowest measured temperatures. Application of 6 T external magnetic field induces two different transitions: (1) an insulator–metal transition around 110 K and (2) a low temperature upturn in resistance values at 30 K. These field-induced transitions suggest strong competition between various interactions present in these materials; this is further supported by the observation of hysteresis in electrical resistance in thermal cooling and warming cycles of measurement. The observed upturn in resistance values below 30 K is presumably due to the combined effect of weak localization, electron–electron and electron–phonon scattering. Magnetization measurements show a paramagnetic–AFM transition at 50 K, but a deviation from a straight line in the 1/M versus T is observed well above 170 K. These results manifest the competition between various possible interactions present in the system.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Magnetic field-induced transitions in La_0.42Eu_0.25Ca_0.33MnO₃perovskite manganite

Turpu¹,

Gupta²,

Reddy³

2009

J. Phys. D: Appl. Phys.

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“…The electrical transport measurements under low magnetic field of such compounds had shown melting of the spin polarons with the increase of magnetic field [16]. The 151 Eu Mössbauer studies in La 0.67−x Eu x Ca 0.33 MnO 3 suggested that the local structural reordering at phase transition boundaries supports the intricate relation between the lattice, charge and spin degree of freedom [17,18]. In a recent study, Reddy et al [19] reported that magnetic field induced transitions in La 0.42 Eu 0.25 Ca 0.33 MnO 3 manganites were due to strong competition between electron, phonon, charge and spin interactions.…”

Section: Introductionmentioning

confidence: 97%

A change from second- to first-order transition in (La_1−xEu_x)_0.67Ca_0.33MnO₃(0 ≤x≤ 0.2)

De¹,

Rawat²,

Ram³

et al. 2012

J. Phys.: Condens. Matter

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A detailed investigation of the paramagnetic to ferromagnetic transition in (La(1-x)Eu(x))(0.67)Ca(0.33)MnO(3) having small Eu(3+)-content (0 ≤ x ≤ 0.2) has been carried out through resistivity and magnetization measurements. X-ray diffraction patterns of the compounds reveal a single phase (La(1-x)Eu(x))(0.67)Ca(0.33)MnO(3) (0 ≤ x ≤ 0.2) of an orthorhombic crystal structure after annealing the precursor at 800 °C for 2 h in air. With increasing Eu(3+)-content, the second-order transition (at x = 0 and 0.1) changes to first-order at x = 0.2. The experimental results demonstrate thermomagnetic irreversibility of the transition for x = 0.2 composition. This arises between the supercooling and superheating regimes where both the ferromagnetic and paramagnetic phases coexist.

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151Eu Mössbauer studies on La0.46Eu0.21Ca0.33MnO3 CMR system

Reddy

Gupta

Reddy

2009

Chemical Physics Letters

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151Eu Mössbauer studies on La0.5Eu0.17Ca0.33MnO3 CMR system

Cited by 5 publications

References 15 publications

Magnetic field-induced transitions in La_0.42Eu_0.25Ca_0.33MnO₃perovskite manganite

Magnetic field-induced transitions in La_0.42Eu_0.25Ca_0.33MnO₃perovskite manganite

A change from second- to first-order transition in (La_1−xEu_x)_0.67Ca_0.33MnO₃(0 ≤x≤ 0.2)

151Eu Mössbauer studies on La0.46Eu0.21Ca0.33MnO3 CMR system

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151Eu Mössbauer studies on La0.5Eu0.17Ca0.33MnO3 CMR system

Cited by 5 publications

References 15 publications

Magnetic field-induced transitions in La0.42Eu0.25Ca0.33MnO3perovskite manganite

Magnetic field-induced transitions in La0.42Eu0.25Ca0.33MnO3perovskite manganite

A change from second- to first-order transition in (La1−xEux)0.67Ca0.33MnO3(0 ≤x≤ 0.2)

151Eu Mössbauer studies on La0.46Eu0.21Ca0.33MnO3 CMR system

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Magnetic field-induced transitions in La_0.42Eu_0.25Ca_0.33MnO₃perovskite manganite

Magnetic field-induced transitions in La_0.42Eu_0.25Ca_0.33MnO₃perovskite manganite

A change from second- to first-order transition in (La_1−xEu_x)_0.67Ca_0.33MnO₃(0 ≤x≤ 0.2)