title: Temperature dependence of the nitrogen-vacancy magnetic resonance in diamond.
abstract: The temperature dependence of the magnetic-resonance spectra of nitrogen-vacancy (NV-) ensembles in the range of 280-330 K was studied. Four samples prepared under different conditions were analyzed with NV- concentrations ranging from 10 ppb to 15 ppm. For all samples, the axial zero-field splitting (ZFS) parameter D was found to vary significantly with temperature, T, as dD/dT=-74.2(7) kHz/K. The transverse ZFS parameter E was nonzero (between 4 and 11 MHz) in all samples, and exhibited a temperature dependence of dE/(EdT)=-1.4(3)x10{-4} K-1. The results might be accounted for by considering local thermal expansion. The temperature dependence of the ZFS parameters presents a significant challenge for diamond magnetometers and may ultimately limit their bandwidth and sensitivity.
authors.affiliation: Department of Physics, University of California, Berkeley, California 94720-7300, USA. vmacosta@berkeley.edu
authors.forename: V M
authors.initials: VM
authors.lastname: Acosta
authors.forename: E
authors.initials: E
authors.lastname: Bauch
authors.forename: M P
authors.initials: MP
authors.lastname: Ledbetter
authors.forename: A
authors.initials: A
authors.lastname: Waxman
authors.forename: L-S
authors.initials: LS
authors.lastname: Bouchard
authors.forename: D
authors.initials: D
authors.lastname: Budker