Charge ordering and magnetoresistance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><

Liu, K.; Wu, Xiaowei; Ahn, K. H.; Sulchek, Todd; Chien, C. L.; Xiao, John Q.

doi:10.1103/physrevb.54.3007

Cited by 127 publications

(49 citation statements)

References 21 publications

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“…At the same time, a neutron diffraction study has shown that at room temperature the crystal structure of the compound corresponds to the standard orthorhombic Pnma space symmetry with lattice parameters a = 5.45 Å, b = 7.63 Å, and c = 5.39 Å [29]. This finding agrees well with previously reported data [35].…”

Section: Methodssupporting

confidence: 91%

“…It can also be seen that the coercive field specific to H cool = 50 kOe is much higher than that specific to H cool = 10 kOe or 20 kOe. This dependence of the coercive field on the cooling field is associated with AFM to FM transformation occurring in magnetic fields above about 30 kOe [35] that results in continuing growth of the volume fraction of the FM phase at the expense of the surrounding AFM matrix.…”

Section: At Temperatures Above T C ~ 70 K M(h) Curves Are Non-hysterementioning

confidence: 99%

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Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields

Fertman

Dolya

Desnenko

et al. 2014

Journal of Applied Physics

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Exchange bias (EB) phenomena have been observed in Nd 2/3 Ca 1/3 MnO 3 colossal magnetoresistance perovskite below the Curie temperature T C ~ 70 K and attributed to an antiferromagnetic (AFM) -ferromagnetic (FM) spontaneous phase segregated state of this compound. Field cooled magnetic hysteresis loops exhibit shifts toward negative direction of the magnetic field axis. The values of exchange field H EB and coercivity H C are found to be strongly dependent of temperature and strength of the cooling magnetic field H cool . These effects are attributed to evolution of the FM phase content and a size of FM clusters. A contribution to the total magnetization of the system due to the FM phase has been evaluated. The exchange bias effect decreases with increasing temperature up to T C and vanishes above this temperature with disappearance of FM phase.Relaxation of a non-equilibrium magnetic state of the compound manifests itself through a training effect also observed while studying EB in Nd 2/3 Ca 1/3 MnO 3 .

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Section: Methodssupporting

confidence: 91%

Section: At Temperatures Above T C ~ 70 K M(h) Curves Are Non-hysterementioning

confidence: 99%

Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields

Fertman

Dolya

Desnenko

et al. 2014

Journal of Applied Physics

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“…Their values well agree with the threshold field of a field-induced AF-FM transition H f ~ 0.4 T found in Nd 2/3 Ca 1/3 MnO 3 at low temperatures [16].…”

Section: Static Magnetizationsupporting

confidence: 85%

Cluster glass magnetism in the phase-separated Nd2/3Ca1/3MnO3 perovskite

Fertman

Dolya

Desnenko

et al. 2012

Journal of Magnetism and Magnetic Materials

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A detailed study of the low-temperature magnetic state and the relaxation in the phase-separated colossal magnetoresistance Nd 2/3 Ca 1/3 MnO 3 perovskite has been carried out. Clear experimental evidence of the cluster-glass magnetic behavior of this compound has been revealed. Well defined maxima in the in-phase linear ac susceptibility χ′(T) were observed, indicative of the magnetic glass transition at T g ~ 60 K. Strongly divergent zero-field-cooled and field-cooled static magnetizations and frequency dependent ac susceptibility are evident of the glassy-like magnetic state of the compound at low temperatures. The frequency dependence of the cusp temperature T max of the χ′(T) susceptibility was found to follow the critical slowing down mechanism. The Cole-Cole analysis of the dynamic susceptibility at low temperature has shown extremely broad distribution of relaxation times, indicating that spins are frozen at "macroscopic" time scale. Slow relaxation in the zerofield-cooled magnetization has been experimentally revealed. The obtained results do not agree with a canonical spin-glass state and indicate a cluster glass magnetic state of the compound below T g , associated with its antiferromagnetic-ferromagnetic nano-phase segregated state. It was found that the relaxation mechanisms below the cluster glass freezing temperature T g and above it are strongly different. Magnetic field up to about m 0 H ~ 0.4 T suppresses the glassy magnetic state of the compound.

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“…These are compounds of the form R 1Ϫx M x MnO 3 (R ϭ La, Nd, or Pr and M ϭ Sr, Ca, Ba, or Pb͒, which were studied extensively in the 1950s. [5][6][7] In addition to the CMR, other noteworthy properties include ͑1͒ a close competition between ferromagnetic phases, favored by the double-exchange mechanism, antiferromagnetic phases, favored by superexchange and correlation effects, and a paramagnetic phase, which appears at high temperatures T, [7][8][9][10][11][12][13] ͑2͒ at half filling, xϭ0.5, this charge ordering can be thought of nominally as Mn 3ϩ ions on one sublattice and Mn 4ϩ ions on the other, superimposed on any magnetic ordering that might exist. For instance, Nd 0.5 Sr 0.5 MnO 3 and La 0.5 Ca 0.5 MnO 3 are charge-ordered antiferromagnets 7,11 ͑AFO's͒ with the ''CE'' crystal structure ͑Fig.…”

mentioning

confidence: 99%

Charge ordering via electron-electron interactions in the colossal-magnetoresistive manganites

1997

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The coupled magnetic and charge-order transition observed in the manganites of the type R 1Ϫx M x MnO 3 near half filling (xӍ1/2) is shown to be the result of the interplay between the doubleexchange, superexchange, and the Coulomb interaction terms in an electronic Hamiltonian. At half filling and temperature Tϭ0 we find, as we increase the strength of the extended-Hubbard repulsion, a first-order transition from a charge-nonordered ferromagnetic metal ͑FN͒ to a charge-ordered antiferromagnetic and insulating ͑AFO͒ ground state. The AFO-FN transition is also obtained by increasing T; however, a small degree of charge order remains in the ferromagnetic phase. The charge-ordered state also ''melts,'' as observed, on the application of a magnetic field, which causes a rapid drop in the transition temperature. Qualitative differences in behavior between members of the manganite series can be understood in terms of small variations in the interaction parameters. ͓S0163-1829͑97͒00930-2͔The observation 1 of colossal magnetoresistance ͑CMR͒ in manganites, which provide the classic examples of the double-exchange magnetic coupling, 2-4 has generated new interest in their intriguing properties. These are compounds of the form R 1Ϫx M x MnO 3 (R ϭ La, Nd, or Pr and M ϭ Sr, Ca, Ba, or Pb͒, which were studied extensively in the 1950s. [5][6][7] In addition to the CMR, other noteworthy properties include ͑1͒ a close competition between ferromagnetic phases, favored by the double-exchange mechanism, antiferromagnetic phases, favored by superexchange and correlation effects, and a paramagnetic phase, which appears at high temperatures T, 7-13 ͑2͒ at half filling, xϭ0.5, this charge ordering can be thought of nominally as Mn 3ϩ ions on one sublattice and Mn 4ϩ ions on the other, superimposed on any magnetic ordering that might exist. For instance, Nd 0.5 Sr 0.5 MnO 3 and La 0.5 Ca 0.5 MnO 3 are charge-ordered antiferromagnets 7,11 ͑AFO's͒ with the ''CE'' crystal structure ͑Fig. 1͒ at low T; on increasing T they go to a ferromagnetic phase via a first-order transition. The AFO phase is insulating but the ferromagnetic phase is metallic. On further increasing T, the ferromagnetic phase goes to an insulating paramagnetic phase via a continuous transition. ͑3͒ The AFO-FN transition temperature T AF→F falls rapidly with increasing magnetic field H, and ͑4͒ at fixed T, the AFO phase can be ''melted'' by the application of the magnetic field.Theoretical studies of these manganites have concentrated on the double-exchange mechanism, 2-4 the effects of electron-phonon interactions, 14 spin-polaron and offdiagonal localization effects, 15 and on spiral, 16 canted, 4,17 or spin and orbital 18 orderings. The relative importance of the various interactions on the physical properties of the manganites is currently the subject of a lively debate.In this paper, we show that the coupled magnetic and charge-order transition observed in these materials, at or near half filling, is described well by an electronic Hamiltonian containing the Hubbard...

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Charge ordering and magnetoresistance inNd1−xCa<

Cited by 127 publications

References 21 publications

Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields

Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields

Cluster glass magnetism in the phase-separated Nd2/3Ca1/3MnO3 perovskite

Charge ordering via electron-electron interactions in the colossal-magnetoresistive manganites

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