Magnetism, spintronics

Relaxation of electron spins of nitrogen centers in structural channels of beryl crystal

R. B. Zaripov^a, I. T. Khairutdinov^a, R. I. Mashkovtsev<sup>b

a</sup> Zavoisky Physical Technical Institute, Kazan Scientific Center of the Russian Academy of Sciences
^b Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk

Abstract: The electron spin-spin and spin-lattice relaxation times of two types of nitrogen centers localized in structural channels of a beryl crystal are measured. The measurements are performed using the electron spin echo method at different orientations of the crystalline sample relative to a constant magnetic field and in a wide temperature range. It is shown that the spin-spin relaxation time of both centers is practically the same and does not depend on orientation. In the temperature range from 300 to 5 K, it varies non-monotonically within the limits from 5100 to 2400 nanoseconds. The spin-lattice relaxation time varies from 0.15 milliseconds to 2 milliseconds in the temperature range from 300 to 5 K.

Keywords: relaxation, beryl crystal, electron spin echo, quantum memory, coherence.

Received: 02.04.2025
Revised: 23.05.2025
Accepted: 25.05.2025

DOI: 10.61011/FTT.2025.05.60748.65-25