Ferromagnetic transition and spin fluctuations in diluted magnetic semiconductors

Bui, Dinh-Hoi; Ninh, Quoc-Huy; Nguyen, Huu-Nha; Phan, Van-Nham

doi:10.1103/physrevb.99.045123

Cited by 9 publications

(4 citation statements)

References 66 publications

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“…The FM state is specified if Tc gets maximum at X = 1 and vise versa, one finds the AFM state if Tc gets maximum at X = -1. Note here that, for a sufficiently large magnetic coupling J > 2, the impurity band is completely separated from the main band [6,12]. For small n, the impurity band is partially filled and the FM phase is formed due to the delocalization of the itinerant carriers.…”

Section: Numerical Resultsmentioning

confidence: 90%

“…Considering the competition of the AFM and FM states and especially their transition features from the paramagnetic (PM) state in a unique theoretical framework is thus extremely fruitful. Feature of the PM-FM transition in DMSs has been proposed in a formation of bound magnetic polarons [7][8][9][10][11][12]. However, it has not been used to explain a mechanism of the PM-AFM transition.…”

Section: Introductionmentioning

confidence: 99%

“…To treat the problem, we use the highly successful dynamical meanfield theory (DMFT) [13]. The DMFT has been widely used in studying the magnetic properties in DMSs and similar systems [6,12,14,15].The DMFT is applied to the Kondo lattice model to evaluate the static spin susceptibility function that momentum dependence keeps only on one parameter in the infinite dimensional limit [16]. Considering the influence of that parameter on the divergence of the static spin susceptibility, one might establish stability of the magnetic order state [16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ferromagnetic-antiferromagnetic Competition in Diluted Magnetic Semiconductors

Nha¹,

Nham

2022

MaP

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The signature of the magnetic competition in a nearly filled impurity band diluted magnetic semiconductors is addressed. In the formalism of the Kondo lattice model, self-consistent equations determining the Green function of the itinerant carrier in the system are evaluated by use of the dynamical mean-field theory. An analytical solution of the static spin susceptibility of the itinerant carrier to specify the magnetic instability is then established. Once the impurity band is nearly filled, one finds the antiferromagnetic instability against the ferromagnetic state. Phase diagrams of the magnetic structures in the diluted magnetic semiconductor were also discussed.

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Section: Numerical Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ferromagnetic-antiferromagnetic Competition in Diluted Magnetic Semiconductors

Nha¹,

Nham

2022

MaP

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“…For the Mn 2+ concentration approaching the paramagneticferromagnetic transition, their spins are no longer independent, and the spin noise in non-Gaussian. The spin fluctuations in this case can be described theoretically using the Landau theory [38,39], effective polaron Hamiltonian [40,41], dynamical mean field theory [42,43], or using more sophisticated approaches [44,45]. In the vicinity of the phase transition the effective Larmor frequency decreases [46] and role of higher order cumulants increases [47].…”

Section: Non-gaussian Spin Noisementioning

confidence: 99%