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Cr^5+ doped K_3NbO_8, considered to be useful as a electron spin qubit, hasbeen investigated by pulsed X-band (~9.7 GHz) and 240 GHz electron paramagneticresonance and electron nuclear double resonance (ENDOR). Comparison of the lowtemperature electronic spin-lattice relaxation rate 1/T_1 at 9.7 and 240 GHzshows that it is 250 times faster at 240 GHz than at X-band. On the other hand,the spin-spin relaxation rate 1/T_2 appears largely frequency independent andis very likely related to the superhyperfine (SHF) coupling of the Cr^5+electron with the surrounding potassium and niobium nuclei. This coupling wasinvestigated by HYSCORE at 9.7 GHz and pulsed Mims ENDOR at 240 GHz. The highfrequency and field enabled us to unambiguously measure the hyperfine andquadrupole couplings of the 39K in spite of its small magnetic moment. We findthat the largest 39K SHF coupling is positive, with 0.522 MHz and 0.20 MHz asits isotropic and dipolar parts respectively. 93Nb ENDOR was dominantly due toits quadrapolar interaction, with a coupling of about 0.8 MHz, and a SHFcoupling of about 0.08 MHz. The significance of these data to spin qubitstudies is pointed out.

Electron Spin Relaxation and 39K Pulsed ENDOR Studies on Cr5+ doped K3NbO8 at 9.7 and 240 GHz