Temperature dependence of the nitrogen-vacancy magnetic resonance in diamond.
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.
Acosta
V M
VM
Department of Physics, University of California, Berkeley, California 94720-7300, USA. vmacosta@berkeley.edu
Bauch
E
E
Ledbetter
M P
MP
Waxman
A
A
Bouchard
L-S
LS
Budker
D
D