Internal field distributions of mesoscopic spin glasses

Vegvar, P. G. N. de; Fulton, T. A.

doi:10.1103/physrevlett.71.3537

Cited by 17 publications

(18 citation statements)

References 26 publications

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“…We note that the field-induced changes of spin configurations have been proposed as the mechanism driving magnetoconductance fluctuations in spin-glass Cu : Mn wires [15]. However, it has recently been demonstrated [28] that the dominant mechanism has its origin in the spin-splitting-induced redistribution of the carriers between the spin subbands, an effect that can also operate in the paramagnetic phase considered here, as discussed in the previous section.…”

Section: ∆ P O C H -1mentioning

confidence: 78%

“…It is interesting to find out whether the spin-splitting effect in question could account for the finite value of (5) and (6), a value quite close to the experimental finding, Hein = 4.2=6.4 kOe [15].…”

Section: Discussionmentioning

confidence: 92%

“…In a spin-glass phase, the perturbing potential associated with the frozen spins leads to the violation of the Onsager-Bűttiker symmetry relations in mesoscopic samples [13][14][15] as well as it alters the scaling factor of the UCF amplitude [5,7]. The fluctuating spins, in turn, because of an extreme sensitivity of the conductance to potential realizations, are expected to be an efficient source of the conductance noise [7-8,l,16].…”

Section: Spin-disorder Scatteringmentioning

confidence: 99%

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Influence of Magnetic Impurities upon Universal conductance Fluctuations

Dietl

1997

Acta Phys. Pol. A

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Mesoscopic phenomena in quantum structures which incorporate magnetic impurities with localized spins may exhibit a number of novel features driven by spin-disorder scattering, exchange spin-splitting of electron bands, and the formation of bound magnetic polarons. After brief information on these effects, their influence on universal conductance fluctuations as well as on low frequency noise and quantum localization is presented. Millikelvin investigations of diffusive charge transport, which have been carried out for submicron wires of n+-Cdi_ x Mnx Te epilayers, are reviewed in some details. These studies have provided information on the significance of spin-disorder scattering in semiconductors and put into the evidence a new driving mechanism of the magnetoconductance fluctuations -the redistribution of the electrons between energy levels of the system, induced by the giant s-d exchange spin-splitting. Important implications of these findings for previous interpretations of spin effects in semiconductor and metal nanostructures are discussed.

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Section: ∆ P O C H -1mentioning

confidence: 78%

Section: Discussionmentioning

confidence: 92%

Section: Spin-disorder Scatteringmentioning

confidence: 99%

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Influence of Magnetic Impurities upon Universal conductance Fluctuations

Dietl

1997

Acta Phys. Pol. A

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“…We note that field-induced changes of spin configurations have been proposed as the mechanism driving magnetoconductance fluctuations in spin-glass Cu:Mn wires [3]. We suggest the existence of another spin effect that can operate also in the paramagnetic phase considered here.…”

mentioning

confidence: 84%

“…Thus, the presence of magnetic impurities, because of their exchange coupling to the carriers, can considerably affect quantum transport phenomena. In particular, a perturbing potential associated with frozen spins leads to violation of the Onsager-Büttiker symmetry relations in mesoscopic samples [2,3]. The fluctuating spins, on the other hand, are an efficient source of the conductance noise [1,4] which, after time-averaging, results in a damping of the fluctuation amplitude [5,6].…”

mentioning

confidence: 99%

Conductance Fluctuations in Quantum Wires of n-CdTe and n-Cd_1-xMn_xTe

et al. 1995

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We present millikelvin studies of magnetoconductance in submicron wires of In-doped n+-CdTe and n+-Cd0.99Μn0.01Te epilayers. Weak-field magnetoresistance which arises from quantum localization as well as universal conductance fluctuations have been observed. The exchange coupling to magnetic impuritles is slown to decrease the correlatioii field of the fluctnations. This novel echect is interpreted by invoking a new driving mechanism of the magnetoconductance fluctuations -the redistribution of the electrons between energy levels of the system, induced by the giant s-d spin-splitting of the electronic states.PACS numbers: 72.15. Rn, 73.20.Fz, 73.61.Ga In mesoscopic regime, where the linear size of a conductor L, becomes comparable to the phase breaking length L^ and/or thermal diffusion length LT, quantum interference of transition amplitudes corresponding to various possible electron trajectories leads to random but reproducible fluctuations of the conductance as a function of external parameters such as a magnetic field [1]. This phenomenon is known as the universal conductance fluctuations (UCF) as their mean amplitude is remarkably insensitive to system properties. The fluctuation pattern, on the other hand, is extremely sensitive to the actual distribution of scattering potential in a given sample. Thus, the presence of magnetic impurities, because of their exchange coupling to the carriers, can considerably affect quantum transport phenomena. In particular, a perturbing potential associated with frozen spins leads to violation of the Onsager-Büttiker symmetry relations in mesoscopic samples [2,3]. The fluctuating spins, on the other hand, are an efficient source of the conductance noise [1,4] which, after time-averaging, results in a damping of the fluctuation amplitude [5,6].

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