The study of double modulation continuous wave (CW) electron spin resonance (DM-EPR) is reported to detect narrow “spin-packet”-like lines within an inhomogeneous CW-EPR line of low concentration P1 (Ns0) centers ([Ns0] < 1 ppm) in diamond. These narrow lines appear as peaks at multiples of modulation frequency in the double modulation spectrum. It is shown that the respective line shape can be fitted assuming two Lorentzian line shapes. The linewidth of the narrower Lorentzian is comparable with the linewidth of the Lorentzian obtained from the relaxation time estimated from the Hahn echo pulsed-EPR experiment. The broader component correlates with the relaxation time obtained from the free induction decay measurement of the inhomogeneous spectral line shape of the P1 center. The ratio derived from DM-EPR measurements approaches within the experimental error the value derived from pulsed-EPR. Sensitivity to the small shift of the magnetic field ( μT) was shown to be detectable from the broadening behavior of the component. The results promote DM-EPR as a method complementary to pulsed-EPR for studying coherence times of low density paramagnetic centers in a diamond lattice like nitrogen-vacancy (NV−) center, since it exhibits similar properties to the here investigated P1 center in terms of long relaxation time at a monitored low concentration.
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12 October 2020
Research Article|
October 14 2020
Detection of narrow lines in the inhomogeneously broadened line of P1 centers in diamond by double modulation EPR spectroscopy
B. Rakvin
;
B. Rakvin
a)
Ruđer Bošković Institute, Division of Physical Chemistry
, Bijenička 54, Zagreb, Croatia
a)Author to whom correspondence should be addressed: rakvin@irb.hr
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D. Carić
;
D. Carić
Ruđer Bošković Institute, Division of Physical Chemistry
, Bijenička 54, Zagreb, Croatia
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M. Kveder
M. Kveder
Ruđer Bošković Institute, Division of Physical Chemistry
, Bijenička 54, Zagreb, Croatia
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a)Author to whom correspondence should be addressed: rakvin@irb.hr
Appl. Phys. Lett. 117, 153503 (2020)
Article history
Received:
August 19 2020
Accepted:
October 01 2020
Citation
B. Rakvin, D. Carić, M. Kveder; Detection of narrow lines in the inhomogeneously broadened line of P1 centers in diamond by double modulation EPR spectroscopy. Appl. Phys. Lett. 12 October 2020; 117 (15): 153503. https://doi.org/10.1063/5.0025833
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