Electron tunneling experiments on amorphous TixTe1−x films

Schmitz, Sebastian; Ewert, S.

doi:10.1016/0038-1098(91)90044-v

Cited by 4 publications

(12 citation statements)

References 28 publications

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“…We derive the states-conserving DOS which is in qualitative accord with experimental observations at energies above U co and which reproduces the AA theory at low energies. We show that, besides the direct experimental study of the states-conserving DOS [12], such DOS was present (but not noticed) also in other experiments [8][9][10].…”

Section: Introductionsupporting

confidence: 59%

“…The resulting ρ(ǫ) is shown in figure 3, the same result was used in panel b of figure 2. The G(V ) curve at 5 K exhibits the peaks which [8], the spectrum on the right from figure 2 of work [9]. The spectra exhibit the AA singularity (studied in cited works) and also the pile up of states features (marked by us).…”

Section: Insight Into Experimentsmentioning

confidence: 76%

“…Equation ( 23) not only conserves the states but in the limit [10], [8], and [9], respectively (see Sect. 4 for details).…”

Section: The States-conserving Dos and Self-energymentioning

confidence: 99%

“…The experimental data in figure 2 originate from the tunneling spectroscopy experiments [8][9][10]12]. In these experiments the electron current (I) is driven through the metalinsulator-metal (MIM) tunnel junction composed of the clean metal and disordered metal of interest.…”

Section: Insight Into Experimentsmentioning

confidence: 99%

“…U co where U co is a characteristic correlation energy. The DOS ∝ |E − E F | at energies |E − E F | U co was observed by tunneling spectroscopy [4][5][6][7][8][9][10][11][12][13][14] and by photoemission spectroscopy [15]. Some experiments [8-10, 12, 15] studied the DOS also for |E − E F | > U co .…”

Section: Introductionmentioning

confidence: 99%

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States-conserving density of states for Altshuler-Aronov effect: Heuristic derivation

Mošková

Moško

2018

Solid State Communications

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Altshuler and Aronov (AA) have shown that the electron-electron interaction in a weakly-disordered metal suppresses the single-particle density of states (DOS) in the vicinity of the Fermi level (EF ). According to the AA theory the suppressed DOS exhibits the energy dependence ∝ |E − EF | valid for |E − EF | smaller than a certain correlation energy Uco. Recent experiments have shown that at energies larger than Uco the DOS exhibits a states-conserving dependence on energy, namely, the states removed from near the Fermi level are found at energies above Uco in the energy range of about 3Uco. In this work the AA effect is studied beyond the low energy limit theoretically. We consider the AA model in which the electrons interact via the statically screened Coulomb interaction and the modification of the DOS is due to the exchange part of the electron selfenergy. We derive the states-conserving DOS heuristically. Namely, we show that the self-energy consists of a diverging part (which we skip on physical grounds) and of the small part of the order of the pair Coulomb energy. This small part gives the states-conserving DOS which is in qualitative accord with experimental observations at energies above Uco and which reproduces the AA result at energies below Uco.

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Section: Introductionsupporting

confidence: 59%

Section: Insight Into Experimentsmentioning

confidence: 76%

“…Equation ( 23) not only conserves the states but in the limit [10], [8], and [9], respectively (see Sect. 4 for details).…”

Section: The States-conserving Dos and Self-energymentioning

confidence: 99%

Section: Insight Into Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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States-conserving density of states for Altshuler-Aronov effect: Heuristic derivation

Mošková

Moško

2018

Solid State Communications

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Electron tunneling experiments on spin glass Ni1−xMnx films

Hatta¹,

Tonokawa²,

Nagao³

et al. 1997

Solid State Communications

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Point contact spectroscopy of superconductors via nanometer scale point contacts formed by resistive switching

et al. 2018

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Point contact spectroscopy is commonly used to investigate electronic properties of superconductors. Here we show that nanometer scale point contacts, which enable to study the superconductor properties locally, can be created by means of the resistive switching phenomenon. Our experiments were performed on sandwiched MgB2/Al/TiO2/Pt structures, where multiple bipolar resistive switching cycles were conducted. The differential conductance as a function of voltage was measured at temperatures below the critical temperature of the MgB2 superconductor. In the low-resistance state the MgB2 and Pt electrodes are connected by an ultrathin metallic filament which creates at the MgB2 electrode the Sharvin point contact with diameter below 10 nm. In this case the differential conductance data demonstrate the Andreev reflections due to the carrier transport between the superconducting MgB2 electrode and filament. From these data the two-gap superconductivity of MgB2 is clearly visible which also confirms the fit by the Blonder-Tinkham-Klapwijk model. If the bottom electrode is made of a superconductor with known gap, our approach allows us to estimate from the Andreev reflection spectrum the resistance of both the filament and point contact. We can then determine from the Sharvin formula the cross-section size of the point contact and thus also the filament cross-section size. In the high resistance state when the filament is ruptured, the differential conductance data demonstrate the spectrum typical for tunneling between two normal metals, with a zero-bias anomaly due to the Altshuler-Aronov effect. This suggests that the filament is not ruptured at the superconducting MgB2 electrode but elsewhere.

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Electron tunneling experiments on amorphous TixTe1−x films

Cited by 4 publications

References 28 publications

States-conserving density of states for Altshuler-Aronov effect: Heuristic derivation

States-conserving density of states for Altshuler-Aronov effect: Heuristic derivation

Electron tunneling experiments on spin glass Ni1−xMnx films

Point contact spectroscopy of superconductors via nanometer scale point contacts formed by resistive switching

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