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Abstract:
We studied the magnetic ground state of Co/Rh-disordered LaCo1-xRhxO3 (x = 0.4, 0.5, and 0.6) by means of powder neutron diffraction (PND), muon spin relaxation (mu SR), ac susceptibility, isothermal magnetic relaxation, and heat capacity measurements. The dc magnetic susceptibility measurements exhibit a cusp around the freezing temperature T-f of all studied compounds. PND measurements show no indications of long-range magnetic ordering down to 4 K in all studied samples. mu SR experiments on these compounds show a peak in the muon spin relaxation rate around T-f. However, no spontaneous muon spin precession can be observed evidencing the short-range nature of the magnetic ordering. For the x = 0.5 sample ac susceptibility measurements show that T-f shifts to higher temperatures with increasing frequency and becomes suppressed by a dc biasing field. All these observations indicate that the Co/Rh-disordered LaCo1-x RhxO3 system is a spin glass for x = 0.4, 0.5, and 0.6.
