skip to main content

SciTech ConnectSciTech Connect

Title: Polarization dependent asymmetric magneto-resistance features in nanocrystalline diamond films

Polar angle-dependence of magneto-resistance (AMR) in heavily nitrogen-incorporated ultra-nanocrystalline diamond (UNCD) films is recorded by applying high magnetic fields, which shows strong anisotropic features at low temperatures. The temperature-dependence of MR and AMR can reveal transport in the weak-localization regime, which is explained by using a superlattice model for arbitrary values of disorder and angles. While a propagative Fermi surface model explains the negative MR features for low degree of disorder the azimuthal angle-dependent MR shows field dependent anisotropy due to the aligned conducting channels on the layers normal to film growth direction. The analysis of MR and AMR can extract the temperature dependence of dephasing time with respect to the elastic scattering time which not only establishes quasi-two dimensional features in this system but also suggests a potential application in monitoring the performance of UNCD based quantum devices.
Authors:
 [1] ;  [2] ;  [1]
  1. Nano-Scale Transport Physics Laboratory, School of Physics, University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg (South Africa)
  2. (United Kingdom)
Publication Date:
OSTI Identifier:
22310910
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; ASYMMETRY; CRYSTAL GROWTH; CRYSTALS; DIAMONDS; ELASTIC SCATTERING; EQUIPMENT; FERMI LEVEL; FILMS; MAGNETIC FIELDS; MAGNETORESISTANCE; NANOMATERIALS; NANOSTRUCTURES; POLARIZATION; SUPERLATTICES; TEMPERATURE DEPENDENCE; TWO-DIMENSIONAL CALCULATIONS