Fermi Surface and Superconductivity in Low-Density High-Mobility Delta-Doped SrTiO3

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The electronic structure of low-density n-type SrTiO{sub 3} {delta}-doped heterostructures is investigated by angular dependent Shubnikov-de Haas oscillations. In addition to a controllable crossover from a three- to two-dimensional Fermi surface, clear beating patterns for decreasing dopant layer thicknesses are found. These indicate the lifting of the degeneracy of the conduction band due to subband quantization in the two-dimensional limit. Analysis of the temperature-dependent oscillations shows that similar effective masses are found for all components, associated with the splitting of the light electron pocket. The dimensionality crossover in the superconducting state is found to be distinct from the normal state, ... continued below

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Kim, M. August 19, 2011.

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The electronic structure of low-density n-type SrTiO{sub 3} {delta}-doped heterostructures is investigated by angular dependent Shubnikov-de Haas oscillations. In addition to a controllable crossover from a three- to two-dimensional Fermi surface, clear beating patterns for decreasing dopant layer thicknesses are found. These indicate the lifting of the degeneracy of the conduction band due to subband quantization in the two-dimensional limit. Analysis of the temperature-dependent oscillations shows that similar effective masses are found for all components, associated with the splitting of the light electron pocket. The dimensionality crossover in the superconducting state is found to be distinct from the normal state, resulting in a rich phase diagram as a function of dopant layer thickness.

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  • Journal Name: Submitted to Physical Review Letters; Journal Volume: 107; Journal Issue: 10

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  • Report No.: SLAC-PUB-14502
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevLett.107.106801 | External Link
  • Office of Scientific & Technical Information Report Number: 1022456
  • Archival Resource Key: ark:/67531/metadc846661

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  • August 19, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Nov. 28, 2016, 3:23 p.m.

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Kim, M. Fermi Surface and Superconductivity in Low-Density High-Mobility Delta-Doped SrTiO3, article, August 19, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc846661/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.