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Friday, July 17, 2020 | History

2 edition of High-field magnetoresistance and quantum oscillations in iron whiskers found in the catalog.

High-field magnetoresistance and quantum oscillations in iron whiskers

Mallikarjun Andanappa Angadi

High-field magnetoresistance and quantum oscillations in iron whiskers

by Mallikarjun Andanappa Angadi

  • 117 Want to read
  • 27 Currently reading

Published .
Written in English

    Subjects:
  • Fermi surfaces,
  • Magnetoresistance,
  • Metallic whiskers,
  • Oscillations,
  • Physics Theses

  • Edition Notes

    ContributionsFawcett, E. (supervisor), Toronto, Ont. University.
    The Physical Object
    Paginationiv, 119 leaves.
    Number of Pages119
    ID Numbers
    Open LibraryOL18588475M

    The topological properties of fermions arise from their low-energy Dirac-like band dispersion and associated chirality. Initially confined to points, extensions of the Dirac dispersion to lines. phase shift in the quantum oscillations associated with the Berry phase of the orbit. While the topological nature of NLSMs appears to be established, evidence for enhanced many-body effects, e.g. as a precursor to any new broken symmetry phases, has yet to emerge. Here, we report a magnetoresistance study of high-quality ZrSiS single crystals up.

      The iron chalcogenide FeSe1−xSx is unique in this respect because its nematic order appears to exist in isolation9–11, although until now, the impact of nematicity on the electronic ground. Since the publication of the first edition over 50 years ago, Introduction to Solid State Physics has been the standard solid state physics text for physics majors. The author’s goal from the beginning has been to write a book that is accessible to undergraduate and consistently teachable. The emphasis in the book has always been on physics rather than formal mathematics.

    Evidence for Dirac fermions in BaMnSb 2 has been obtained from the further analyses of the SdH oscillations. As shown in Fig. 2c,f, the effective cyclotron mass m * can be extracted from the fit of the temperature dependence of the normalized FFT peak amplitude to the thermal damping factor of Lifshitz-Kosevich (LK) equat i.e., where ρ 0 is the zero field resistivity, and α = (2π 2 k. We were able to observe QOs at all pressures. The oscillatory part of the magnetoresistance at a fixed temperature of K is shown in Fig. relative oscillation amplitude (Δρ c /ρ c) increases by around a factor of 2 between p = 0 and p = GPa but then remains approximately constant as pressure is increased further. There is a shift in the phase of the oscillations as a function.


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High-field magnetoresistance and quantum oscillations in iron whiskers by Mallikarjun Andanappa Angadi Download PDF EPUB FB2

Home > Journals > Canadian Journal of Physics > List of Issues > Vol Number 3, February > High Field Magnetoresistance and Quantum Oscillations in Iron Whiskers Article « Cited by: 6.

High Field Magnetoresistance and Quantum Oscillations in Iron Whiskers Article in Canadian Journal of Physics 53(3) February with 2 Reads How we measure 'reads'.

adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86AAuthor: Mallikarjun Andanappa Angadi. Longitudinal magnetoresistance for Bi wire with d = nm in a magnetic field up to 35 T at T = K.

Arrows indicate: QL e – quantum limit of electrons, 2h and 3h are indexed as peaks of quantum oscillations from holes, B max – the Chambers : E. Condrea, A.

Gilewski, A. Nicorici. High-field effects on the resistivity were studied in the s on high-quality whiskers. At low temperatures, Shubnikov–de Haas oscillations in the quantum limit have provided direct information on the Fermi surface. However, little has been reported at higher temperature on the magnetic contribution to the electronic transport in high Cited by: Magnetization and magnetoresistance measurements have been made on amorphous Fe −x B x (13≤×≤21) and (Fe l-y Cr y) 84 B 16 (0≤y≤) alloy ribbons in high magnetic field up to kOe pulse field for magnetization and 70 kOe steady field for magnetoresistance.

Preliminary results show that the Fe-B alloys have a large high-field susceptibility which varies considerably with. A Landau-level broadening-dependent phase shift has been observed between the Shubnikovde Haas oscillations of the magnetoresistance and the Hall effect in a series of Hg 1−x Mn x Te and Hg 1−x Cd x Te samples.

The phase shift varies between 0 and 90° and appears not to be influenced by the exchange interaction between the Mn 2+ ions and the carriers. The results are in. Furthermore, the Aharonov-Bohm effect has been used and demonstrated in systems such as iron whiskers (24), superconducting films (thus completely excluding the magnetic field from the electron's.

Inset: zoom-in on the high-field transverse magnetoresistance of device D1, showing the presence of SdH oscillations. (h) Derivative of the longitudinal resistivity ρ xx (B) that puts in evidence the SdH oscillations, which start from 5–7 T, depending on the device.

In all panels black, red and blue curves represent data measured on D1, D2. Novel Materials and Ground States Fermi Surfaces of Metals – magnetoresistance and quantum oscillations PHY B F14 Sergey L.

Bud’ko [part of the slides (blue) are taken from the presentation of Ilya Sheikin (Grenoble). Quantum oscillations in the magnetoresistance of our single crystal whisker, with the magnetic field applied in the basal plane, are shown in figure?7, together with the amplitude spectra over two field ranges: from 8 to 12?T, and 16 to 18?T.

Figure?8 shows typical quantum oscillatory magnetization for the Grenoble single crystal, detected at. Quantum oscillations, ascribable to the “d-bands” of platinum, have been observed with 70 - MHz longitudinal ultrasound at about °K in magnetic fields up to 60 kG.

A comparison is made with published de Haas-van Alphen effect data, which these observations seem slightly to extend. At a temperature of K one observes negative magnetoresistance on the &rgr;(B) curves in the field interval 0–10 kG, due to the dominance of the contribution to the magnetoresistance from the.

Negative magnetoresistance of InSb whiskers with different impurity concentrations × – × cm−3 was studied in longitudinal magnetic field 0–14 T in the temperature range 4. The others are both the spin-state transition of Co3+Co3+ in clusters and quantum interference effects, which are enhanced by an applied field and produce a positive magnetoresistance.

Finally, pure and unstrained iron whiskers are available. Mainly whiskers with 〈1 0 0〉 growth direction and a square (or nearly square) cross section are obtained as shown in figure 1.

The chosen annealing conditions ensure that the whiskers consist of α iron. Four gold wires with a diameter of 30 µm were fixed by conductive epoxy glue. Linear magnetoresistance. In addition to quantum transport phenomena such as Shubnikov–de Haas oscillations and weak antilocalisation, a strong background magnetoresistance (MR) was also observed in the 3D TIs Bi 2 Te 3, Bi 2 Se 3, and Bi 2 Te 2 Se.

Magnetoresistance oscillations periodic in the ratio of the diameter of the cyclotron orbit to the modulation period have been found above this field. The semiclassical theory is used to explain both effects.

We show that the oscillations may be thought of as oscillations. We propose a mean-field approach to describe the fluxoid dependence of magnetoresistance oscillations measured on two YBa 2 Cu 3 O 7−x (YBCO) nanorings.

We unveil the relation between the quantum interference processes and current localization phenomena in superconductor nanorings, which are non-ideal because of the presence of stubs. Quantum oscillation measurements in the underdoped copper oxide YBa2Cu3O6 + x reveal a nodal electronic structure from charge order, which.

The latter involved using high magnetic fields and low temperatures to use quantum oscillations [Shubnikov de Haas and de Haas van Alphen] and angle-dependent magnetoresistance oscillations [AMRO] to map out Fermi surfaces. I first met Brooks in at a conference in Korea, just after I had moved to University of New South Wales.Magnetoresistance is the tendency of a material (often ferromagnetic) to change the value of its electrical resistance in an externally-applied magnetic are a variety of effects that can be called magnetoresistance.

Some occur in bulk non-magnetic metals and semiconductors, such as geometrical magnetoresistance, Shubnikov de Haas oscillations, or the common positive. As a result, we find a giant anisotropic magnetoresistance (AMR) with a magnitude of up to 80%, a value comparable to the AMR observed in the quantum anomalous Hall phase of ferromagnetic topological insulator thin films, and an order of magnitude larger than the bulk AMR of conventional ferromagnetic alloys.