Polarization dependent asymmetric magneto-resistance features in nanocrystalline diamond films

Journal Article · Mon Aug 18 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4893662· OSTI ID:22310910

Bhattacharyya, Somnath ^[1]; Churochkin, Dmitry ^[1]

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1. Nano-Scale Transport Physics Laboratory, School of Physics, University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg (South Africa)

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.

• OSTI ID: 22310910
• Journal Information: Applied Physics Letters, Vol. 105, Issue 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

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