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Title: Quantum oscillations in strong magnetic fields, berry phase, and superconductivity in three-dimensional topological Bi{sub 2–x}Cu{sub x}Se{sub 3} insulators

Abstract

Two-dimensional (2D) Shubnikov–de Haas oscillations and 2D Hall oscillations are observed in 3D copper-doped Bi{sub 2}Se{sub 3} single crystals in magnetic fields up to 19.5 T at temperatures down to 0.3 K. Three samples with a high bulk carrier concentration (n ≈ 10{sup 19}–10{sup 20} cm{sup –3}) are studied. The rotation of the samples in a magnetic field shows that these oscillations are related to numerous parallel 2D conducting channels 1–5 nm thick. Their basic kinetic parameters are found. Quantized Hall resistance R{sub xy} is detected in 1-nm-thick 2D conducting channels at high fields. The distance Δ(1/R{sub xy}) between the steps in the field dependence of 1/R{sub xy} is found to be constant for different Landau levels, 1.3e{sup 2}/h per 1-nm-thick layer. The constructed fan diagrams of 2D Landau levels for various angles of sample inclination with respect to the magnetic field direction allowed us to conclude that the Berry phase in the 2D conducting channels is γ ≈ π and independent of the magnetic field direction. When studying the angular dependence of upper resistive critical magnetic field H{sub c2} in one of the superconducting samples, we showed that it can be considered as a bulk superconductor consisting of superconductingmore » layers with an effective thickness of about 50 nm.« less

Authors:
; ; ;  [1]
  1. Russian Academy of Sciences (Russian Federation)
Publication Date:
OSTI Identifier:
22472198
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 1; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BISMUTH SELENIDES; CONCENTRATION RATIO; COPPER; DIAGRAMS; DOPED MATERIALS; INCLINATION; LAYERS; MAGNETIC FIELDS; MONOCRYSTALS; OSCILLATIONS; ROTATION; SHUBNIKOV-DE HAAS EFFECT; SUPERCONDUCTIVITY; SUPERCONDUCTORS; TWO-DIMENSIONAL SYSTEMS

Citation Formats

Vedeneev, S. I., E-mail: vedeneev@sci.lebedev.ru, Knyazev, D. A., Prudkoglyad, V. A., Romanova, T. A., and Sadakov, A. V. Quantum oscillations in strong magnetic fields, berry phase, and superconductivity in three-dimensional topological Bi{sub 2–x}Cu{sub x}Se{sub 3} insulators. United States: N. p., 2015. Web. doi:10.1134/S1063776115060217.
Vedeneev, S. I., E-mail: vedeneev@sci.lebedev.ru, Knyazev, D. A., Prudkoglyad, V. A., Romanova, T. A., & Sadakov, A. V. Quantum oscillations in strong magnetic fields, berry phase, and superconductivity in three-dimensional topological Bi{sub 2–x}Cu{sub x}Se{sub 3} insulators. United States. https://doi.org/10.1134/S1063776115060217
Vedeneev, S. I., E-mail: vedeneev@sci.lebedev.ru, Knyazev, D. A., Prudkoglyad, V. A., Romanova, T. A., and Sadakov, A. V. Wed . "Quantum oscillations in strong magnetic fields, berry phase, and superconductivity in three-dimensional topological Bi{sub 2–x}Cu{sub x}Se{sub 3} insulators". United States. https://doi.org/10.1134/S1063776115060217.
@article{osti_22472198,
title = {Quantum oscillations in strong magnetic fields, berry phase, and superconductivity in three-dimensional topological Bi{sub 2–x}Cu{sub x}Se{sub 3} insulators},
author = {Vedeneev, S. I., E-mail: vedeneev@sci.lebedev.ru and Knyazev, D. A. and Prudkoglyad, V. A. and Romanova, T. A. and Sadakov, A. V.},
abstractNote = {Two-dimensional (2D) Shubnikov–de Haas oscillations and 2D Hall oscillations are observed in 3D copper-doped Bi{sub 2}Se{sub 3} single crystals in magnetic fields up to 19.5 T at temperatures down to 0.3 K. Three samples with a high bulk carrier concentration (n ≈ 10{sup 19}–10{sup 20} cm{sup –3}) are studied. The rotation of the samples in a magnetic field shows that these oscillations are related to numerous parallel 2D conducting channels 1–5 nm thick. Their basic kinetic parameters are found. Quantized Hall resistance R{sub xy} is detected in 1-nm-thick 2D conducting channels at high fields. The distance Δ(1/R{sub xy}) between the steps in the field dependence of 1/R{sub xy} is found to be constant for different Landau levels, 1.3e{sup 2}/h per 1-nm-thick layer. The constructed fan diagrams of 2D Landau levels for various angles of sample inclination with respect to the magnetic field direction allowed us to conclude that the Berry phase in the 2D conducting channels is γ ≈ π and independent of the magnetic field direction. When studying the angular dependence of upper resistive critical magnetic field H{sub c2} in one of the superconducting samples, we showed that it can be considered as a bulk superconductor consisting of superconducting layers with an effective thickness of about 50 nm.},
doi = {10.1134/S1063776115060217},
url = {https://www.osti.gov/biblio/22472198}, journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 1,
volume = 121,
place = {United States},
year = {2015},
month = {7}
}