Theoretical study of the role of charge ordering in antiferromagnetically ordered manganites

Panda, Saswati; Kar, Jayanta; Rout, G. C.

doi:10.1088/2053-1591/3/9/096104

“…Microscopic model study and phase diagram of multiferroic perovskite manganites (Mochizuki and Furukawa, 2009) shows that the strength of NN and NNN coupling are comparable and the NNN coupling plays a vital role in determining the magnetic properties. Considering only the NN interaction in a DE model in the presence of ferromagnetism (FM) and charge ordering (CO), the studies of magnetisation (Rout et al, 2009a;Panda and Rout, 2009), magnetic susceptibility , velocity of sound (Rout and Panda, 2009), Raman spectra ) and for AFM-CO manganites study of the tunnelling conductance spectra (Panda et al, 2016) successfully explained MI transition and strong electron-phonon interaction in CMR manganites. Further the studies of magnetic susceptibility (Rout et al, 2007), magnetoresistivity (Rout et al, 2009b) for an FM-JT model in the presence of hybridisation interaction between conduction and core electrons and study of resistivity for the same FM-JT model in the presence DE interaction (Rout et al, 2011;Panda et al, 2012) explain the CMR effect below T C .…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of anisotropy in orbital and antiferromagnetic spin orderings in CMR manganites

Panda¹,

Sahoo²,

Rout

³

2019

IJNBM

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We report here a tight binding model for doped rare earth manganites consisting of Kubo-Ohata type double exchange (DE) interaction between the e g and t 2g band electron spins of same site. A Heisenberg type antiferromagnetic spin-spin interaction is considered among the core band electrons. Both nearest and next nearest neighbouring interactions are taken in the Heisenberg coupling and kinetic energy interaction. The presence of DE interaction induces antiferromagnetism (AFM) in e g band. The Jahn-Teller (JT) distortion leads to anisotropy in the manganite systems. We have considered JT distortion as an extra mechanism. The model Hamiltonian is solved using Zubarev's Green's function technique. The interplay between temperature dependent lattice strain and transverse spin fluctuations is studied. We have studied the in-plane anisotropy observed in the AFM spin fluctuation and its effect on the lattice strain.

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“…Microscopic model study and phase diagram of multiferroic perovskite manganites (Mochizuki and Furukawa, 2009) shows that the strength of NN and NNN coupling are comparable and the NNN coupling plays a vital role in determining the magnetic properties. Considering only the NN interaction in a DE model in the presence of ferromagnetism (FM) and charge ordering (CO), the studies of magnetisation (Rout et al, 2009a;Panda and Rout, 2009), magnetic susceptibility , velocity of sound (Rout and Panda, 2009), Raman spectra ) and for AFM-CO manganites study of the tunnelling conductance spectra (Panda et al, 2016) successfully explained MI transition and strong electron-phonon interaction in CMR manganites. Further the studies of magnetic susceptibility (Rout et al, 2007), magnetoresistivity (Rout et al, 2009b) for an FM-JT model in the presence of hybridisation interaction between conduction and core electrons and study of resistivity for the same FM-JT model in the presence DE interaction (Rout et al, 2011;Panda et al, 2012) explain the CMR effect below T C .…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of anisotropy in orbital and antiferromagnetic spin orderings in CMR manganites

Panda¹,

Sahoo²,

Rout

³

2019

IJNBM

Self Cite

0

View full text Add to dashboard Cite

We report here a tight binding model for doped rare earth manganites consisting of Kubo-Ohata type double exchange (DE) interaction between the e g and t 2g band electron spins of same site. A Heisenberg type antiferromagnetic spin-spin interaction is considered among the core band electrons. Both nearest and next nearest neighbouring interactions are taken in the Heisenberg coupling and kinetic energy interaction. The presence of DE interaction induces antiferromagnetism (AFM) in e g band. The Jahn-Teller (JT) distortion leads to anisotropy in the manganite systems. We have considered JT distortion as an extra mechanism. The model Hamiltonian is solved using Zubarev's Green's function technique. The interplay between temperature dependent lattice strain and transverse spin fluctuations is studied. We have studied the in-plane anisotropy observed in the AFM spin fluctuation and its effect on the lattice strain.

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A model study of tunneling conductance spectra of ferromagnetically ordered manganites

Panda¹,

Kar²,

Rout

³

2018

Journal of Magnetism and Magnetic Materials

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Theoretical study of the role of charge ordering in antiferromagnetically ordered manganites

Cited by 4 publications

References 36 publications

Theoretical study of anisotropy in orbital and antiferromagnetic spin orderings in CMR manganites

Theoretical study of anisotropy in orbital and antiferromagnetic spin orderings in CMR manganites

Theoretical study of anisotropy in orbital and antiferromagnetic spin orderings in CMR manganites

A model study of tunneling conductance spectra of ferromagnetically ordered manganites

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