Magnetic Ordering and Relation to the Metal-Insulator Transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>MnO</mml:mi>

Kawano, H.; Kajimoto, Ryoichi; Yoshizawa, H.; Tomioka, Y.; Kuwahara, H.; Tokura, Y.

doi:10.1103/physrevlett.78.4253

Cited by 495 publications

(309 citation statements)

References 16 publications

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“…In some cases, as the temperature T is increased, insulator-metal transitions are seen; these are driven by the destruction of charge ordering, reminiscent of the Verwey transition in magnetite [17], but, unlike the case for magnetite, with an accompanying antiferromagnet-to-ferromagnet transition. For instance, at low T , Nd 0.5 Sr 0.5 MnO 3 is a charge-ordered antiferromagnet that has the complex CE structure [3] and undergoes a first-order transition to a charge-disordered ferromagnet when T is raised [2,12,18,19]. 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.…”

Section: Introductionmentioning

confidence: 99%

“…With the localized spins treated as classical, the energy difference between the parallel and antiparallel alignment of the itinerant spin with respect to the localized spin is given by 2J H S, which is about 3 eV from band calculations [24]. In most of our studies we use the unit cell of the well-known 'CE' structure, a ubiquitous chargeand spin-ordered structure in the manganites observed for x 0.5 [2,12,18,19]. We define the scaled couplings J ≡J S 2 , J H ≡J H S, and H ≡ |H|S, and use the following as typical parameters:…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…One of the most intriguing members of this family of materials is Nd 0.5 Sr 0.5 MnO 3 . A number of fascinating phenomena have been recently discovered and studied in Nd 0.5 Sr 0.5 MnO 3 (see, for example [2][3][4]), that made this compound extremely attractive from the point of view of testing recent theoretical predictions, including those involving charge and orbital effects.…”

mentioning

confidence: 99%

“…At a temperature of about 250 K (T C ) it becomes a ferromagnetically (FM) ordered metal. At yet lower temperatures of about 160 K the sample undergoes a transition into a charge-ordered (CO) insulating state [4], characterized by the co-existence of A-type antiferromagnetic (AF-A) and CE-type antiferromagnetic (AF-CE) phases [3,6]. The existence of the AF-A phase in samples with nominal composition Nd 0.5 Sr 0.5 MnO 3 can be attributed to a slight excess of Mn 4+ [7], that indicates an extremely delicate competition between FM, AF-CE and AF-A states in Nd 0.5 Sr 0.5 MnO 3 with x~0.5.…”

mentioning

confidence: 99%

“…The existence of the AF-A phase in samples with nominal composition Nd 0.5 Sr 0.5 MnO 3 can be attributed to a slight excess of Mn 4+ [7], that indicates an extremely delicate competition between FM, AF-CE and AF-A states in Nd 0.5 Sr 0.5 MnO 3 with x~0.5. The development of the AF-A phase starts at a temperature, higher than the temperature of the transition into the AF-CE phase [3,6]. The key feature of the AF-CE phase is the alternate ordering of the Mn 3+ and Mn 4+ ions into a CO state, which is accompanied by the (3z 2 -r 2 )-orbital ordering (OO) [2].…”

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Microwave properties of Nd0.5Sr0.5MnO3: a key role of the (x2−y2)-orbital effects

Zvyagin¹,

Angerhofer²,

Kamenev³

et al. 2002

Solid State Communications

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Transmittance of the colossal magnetoresistive compound Nd 0.5 Sr 0.5 MnO 3 showing metal-insulator phase transition has been studied by means of the submm-and mmwavelength band spectroscopy. An unusually high transparency of the material provided direct evidence for the significant suppression of the coherent Drude weight in the ferromagnetic metallic state. Melting of the A-type antiferromagnetic states has been found to be responsible for a considerable increase in the microwave transmission, which was observed at the transition from the insulating to the metallic phase induced by magnetic field or temperature. This investigation confirmed a dominant role of the ( Optical reflectivity studies play a central role in the determination of the electronic and orbital states of r are-earth manganese oxides. Far-infrared (FIR) spectroscopy plays an especial role, providing important information about low-energy optical properties and characteristics of the manganites, including the Drude-weight contribution and, thus, the metallicity of these materials. Unfortunately, reflectivity spectra are very sensitive to the quality of the sample surface, that eventually may cause

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Characteristic Phonon Scattering Enhancement Correlated with Magnetic and Charge Orders in La1?XSrXMnO3 (X ? 0.50)

Ikebe

Fujishiro

Kanoh

et al. 2001

phys. stat. sol. (b)

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Magnetic Ordering and Relation to the Metal-Insulator Transition inPr1−xSrxMnO

Cited by 495 publications

References 16 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

Microwave properties of Nd0.5Sr0.5MnO3: a key role of the (x2−y2)-orbital effects

Characteristic Phonon Scattering Enhancement Correlated with Magnetic and Charge Orders in La1?XSrXMnO3 (X ? 0.50)

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