We investigate the substituted spinel Mg1-xMn2+xO4, in five powder compositions 0 less than or equal to x less than or equal to 1, where divalent Mg is expected to occupy mainly the B spinel site. A zero-field precession is detected for all samples below an x-dependent ordering temperature, which is different from that detected by macroscopic magnetization. The precessing amplitude in the ordered phase displays temperature-dependent deviations from the canonical value of expected for our powder samples, indicating the presence of a radical state. The difference between the SQUID and the muSR-order temperatures is attributed to a collinear intermediate state stabilized by Mg.
Magnetic order and spin dynamics in substituted spinel Mg1-xMn2+xO4 / DE RENZI, Roberto; Allodi, Giuseppe; Mazzoli, C.; Ghigna, P.; Malavasi, L.. - In: PHYSICA. B, CONDENSED MATTER. - ISSN 0921-4526. - 326:(2003), pp. 509-512. [10.1016/S0921-4526(02)01678-2]
Magnetic order and spin dynamics in substituted spinel Mg1-xMn2+xO4
DE RENZI, Roberto;ALLODI, Giuseppe;
2003-01-01
Abstract
We investigate the substituted spinel Mg1-xMn2+xO4, in five powder compositions 0 less than or equal to x less than or equal to 1, where divalent Mg is expected to occupy mainly the B spinel site. A zero-field precession is detected for all samples below an x-dependent ordering temperature, which is different from that detected by macroscopic magnetization. The precessing amplitude in the ordered phase displays temperature-dependent deviations from the canonical value of expected for our powder samples, indicating the presence of a radical state. The difference between the SQUID and the muSR-order temperatures is attributed to a collinear intermediate state stabilized by Mg.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
