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Control of Mooij correlations at the nanoscale in the disordered metallic Ta-nanoisland FeNi multilayers | | N.N. Kovaleva
; F.V. Kusmartsev
; A.B. Mekhiya
; I.N. Trunkin
; D. Chvostova
; A.B. Davydov
; L.N. Oveshnikov
; O. Pacherova
; I.A. Sherstnev
; A. Kusmartseva
; K.I. Kugel
; A. Dejneka
; F.A. Pudonin
; Y. Luo
; B.A. Aronzon
; | | Date: |
22 Aug 2020 | | Abstract: | Localisation phenomena in highly disordered metals close to the extreme
conditions determined by the Mott-Ioffe-Regel (MIR) limit when the electron
mean free path is approximately equal to the interatomic distance is a
challenging problem. Here, to shed light on these localisation phenomena, we
studied the dc transport and optical conductivity properties of nanoscaled
multilayered films composed of disordered metallic Ta and magnetic FeNi
nanoisland layers, where ferromagnetic FeNi nanoislands have giant magnetic
moments of 10^3-10^5 Bohr magnetons (mu_B). In these multilayered structures,
FeNi nanoisland giant magnetic moments are interacting due to the indirect
exchange forces acting via the Ta electron subsystem. We discovered that the
localisation phenomena in the disordered Ta layer can be associated with
electronic inhomogeneities leading to the appearance of the low-energy
excitations strongly superimposed in the optical conductivity with the Drude
contribution of free charge carriers. From the consistent results of the dc
transport and optical studies we found that with an increase in the FeNi layer
thickness across the percolation threshold evolution from the
superferromagnetic to ferromagnetic behaviour within the FeNi layer leads to
the delocalisation of Ta electrons from the associated electronic
inhomogeneities. On the contrary, we discovered that when the FeNi layer is
discontinuous and represented by randomly distributed superparamagnetic FeNi
nanoislands, the Ta layer normalized resistivity falls down below the MIR limit
by about 60%. The discovered effect leading to the resistivity fall below the
MIR limit can be associated with non-ergodicity and purely quantum localisation
phenomena, which need to be challenged further. | | Source: | arXiv, 2008.09779 | | Services: | Forum | Review | PDF | Favorites | |
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