Aggregate frequency width, nuclear hyperfine coupling and Jahn–Teller effect of Cu2+ impurity ion ESR in SrLaAlO4 dielectric resonator at 20 millikelvin

Abstract

The impurity paramagnetic ion, substitutes Al in the single crystal lattice, this results in a elongated octahedron, and the resulting measured g-factors satisfy four-fold axes variation condition. The aggregate frequency width of the electron spin resonance with the required minimum level of impurity concentration has been evaluated in this single crystal at 20 millikelvin. Measured parallel hyperfine constants, , were determined to be and at for the nuclear magnetic quantum number , and respectively. The anisotropy of the hyperfine structure reveals the characteristics of the static Jahn–Teller effect. The second-order-anisotropy term, , is significant and cannot be disregarded, with the local strain dominating over the observed Zeeman-anisotropy-energy difference. The Bohr electron magneton, , (within so-called experimental error) has been found using the measured spin-Hamiltonian parameters. Measured nuclear dipolar hyperfine structure parameter shows that the mean inverse third power of the electron distance from the nucleus is a.u. for ion in the substituted ion site assuming nuclear electric quadruple moment barn.