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Tomioka, Y.; Asamitsu, A.; Moritomo, Yutaka; Kuwahara, H.; Tokura, Y.

doi:10.1103/physrevlett.74.5108

Cited by 732 publications

(374 citation statements)

References 23 publications

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“…The extended-Hubbard term in our model is crucial for the metal-insulator transitions that are associated with the loss of charge ordering seen in the experiments [15,16,20]. The magnetic field dependence of this transition is also in good accord with experiments [18,20].…”

Section: Discussionsupporting

confidence: 73%

“…This is in accord with experiments [18,20] which have reported the 'melting' of the charge-ordered antiferromagnet on the application of a weak magnetic field. Note that, given our parameters, the field required to reduce T AF→F to zero is comparable to that found in experiments.…”

Section: Mean-field Calculations At Tsupporting

confidence: 80%

“…For x = 1/2, the AFO phase is bounded on both sides by two-phase coexistence regimes (coexistence of AFO and a weakly charge-ordered FO), which meet at a point of equal concentration at T = T AF→F ( 0.03 eV for the parameters of figure 7). The temperature at which this point of equal concentration appears drops rapidly with the magnetic field H as shown in figure 8; this is in agreement with experiments [18,20]. On further increasing T , the degree of charge ordering in the FO phase increases, until a first-order FO-FN transition occurs at T 0.2 eV, and, at much higher temperatures T 1 eV, a continuous FN-PN transition results as shown in figure 6; here PN stands for an insulating, non-ordered, paramagnetic phase.…”

Section: Introductionsupporting

confidence: 77%

“…(2) The charge-ordered AFO phase can be 'melted' by the application of a weak magnetic field as in experiments [18,20].…”

Section: Mean-field Calculations At Tmentioning

confidence: 99%

“…Doping-driven, first-order ferromagnet-to-antiferromagnet transitions (presumably associated with charge ordering) have also been reported for La 1−x Ca x MnO 3 [15,16], though the question of first-order phase coexistence has not been investigated sufficiently, as we discuss later. The transition from a charge-ordered antiferromagnetic insulator (AFO) to a chargedisordered (or charge-non-ordered) ferromagnetic metal (FN) can also be obtained by changing the magnetic field H ; e.g., in both Pr 0.5 Sr 0.5 MnO 3 and Nd 0.5 Sr 0.5 MnO 3 [18,20] the transition temperature T AF→F decreases rapidly with increasing H . There is also growing evidence that charge ordering in Ln 1−x A x MnO 3 is related to the width of the e g band, which is in turn determined by the average radius r A of the A-site cations [13]: if r A 1.18, only charge ordering is observed; if 1.18 r A 1.25, charge ordering is observed at low T but a metallic ferromagnet (FN) appears as T is raised; if 1.25 r A , only an FN phase is observed.…”

Section: Introductionmentioning

confidence: 99%

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Mean-field theory of charge ordering and phase transitions in the colossal-magnetoresistive manganites

Mishra

Pandit

Satpathy

1999

J. Phys.: Condens. Matter

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Abstract. We study phase transitions in the colossal-magnetoresistive manganites by using a mean-field theory both at zero and non-zero temperatures. Our Hamiltonian includes doubleexchange, superexchange, and Hubbard terms with on-site and nearest-neighbour Coulomb interaction, with the parameters estimated from earlier density-functional calculations. The phase diagrams show magnetic and charge-ordered (or charge-disordered) phases as a result of the competition between the double-exchange, superexchange, and Hubbard terms, the relative effects of which are sensitively dependent on parameters such as doping, bandwidth, and temperature. In accord with the experimental observations, several important features are reproduced from our model, namely, (i) a phase transition from an insulating, charge-ordered antiferromagnetic to a metallic, charge-disordered ferromagnetic state near dopant concentration x = 1/2, (ii) the reduction of the transition temperature T AF→F by the application of a magnetic field, (iii) melting of the charge order by a magnetic field, and (iv) phase coexistence for certain values of temperature and doping. An important feature, not reproduced in our model, is the antiferromagnetism in the electron-doped systems, e.g., La 1−x Ca x MnO 3 over the entire range of 0.5 x 1, and we suggest that a multi-band model which includes the unoccupied t 2g orbitals might be an important ingredient for describing this feature.

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Section: Discussionsupporting

confidence: 73%

Section: Mean-field Calculations At Tsupporting

confidence: 80%

Section: Introductionsupporting

confidence: 77%

“…(2) The charge-ordered AFO phase can be 'melted' by the application of a weak magnetic field as in experiments [18,20].…”

Section: Mean-field Calculations At Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mean-field theory of charge ordering and phase transitions in the colossal-magnetoresistive manganites

Mishra

Pandit

Satpathy

1999

J. Phys.: Condens. Matter

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Anomalies of Hall Effect and Magnetoresistance in Oxygen Deficient La2/3A1/3MnO3—δ Epitaxial Layers

Mandal

Poddar

Jansen

et al. 1998

phys. stat. sol. (a)

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Magnetotransport Properties of the Sm0.35Nd0.35M0.3Mn1—xFexO3 (M = Pb, Cd; x = 0, 0.1) Manganites

Moreno

Campoy

Blanco

et al. 2000

phys. stat. sol. (b)

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Polycrystalline samples of the mixed‐valence perovskite‐type manganites Sm0.35Nd0.35M0.3Mn1—xFexO3 (M = Pb, Cd; x = 0, 0.1) have been synthesised and their magnetic and transport properties studied. Magnetic measurements show that TC values decrease considerably with the presence of cadmium or iron. Colossal magnetoresistance has been shifted to lower temperatures. Values of magnetoresistance near to 40% have been obtained. The presence of defined maxima in the real part of ac susceptibility at the same temperature of the cusp in the zero field cooling curves corroborates cluster‐glass behaviour.

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Collapse of a Charge-Ordered State under a Magnetic Field inPr1/2Sr1/2MnO

Cited by 732 publications

References 23 publications

Mean-field theory of charge ordering and phase transitions in the colossal-magnetoresistive manganites

Mean-field theory of charge ordering and phase transitions in the colossal-magnetoresistive manganites

Anomalies of Hall Effect and Magnetoresistance in Oxygen Deficient La2/3A1/3MnO3—δ Epitaxial Layers

Magnetotransport Properties of the Sm0.35Nd0.35M0.3Mn1—xFexO3 (M = Pb, Cd; x = 0, 0.1) Manganites

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