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Parimagnetism: Strongly correlated paramagnetism in RCo2

AutorBonilla, C. M.; Herrero-Albillos, Julia; Calvo, I.; Figueroa, A. I.; Castán-Guerrero, C.; Rodríguez-Velamazán, J. A.; Bartolomé, Juan; García, L. M.; Bartolomé, Fernando
Fecha de publicación2012
CitaciónGEFES 2012
ResumenA new magnetic configuration within the paramagnetic phase of ErCo2 was proposed in 2007 as result of small angle neutron scattering (SANS), X-ray circular dichroism (XMCD) and ac susceptibility experiments. Within this magnetic configuration, coined as parimagnetism, the Co moments are disordered at the long-range but a net Co magnetic moment, antiparallel to the applied field (and to Er moment) is found, up to a certain temperature, Tf, well above Tc. The Co moment changes its orientation at Tf recovering the normal paramagnetic configuration. Short-range order between the Co atoms has been identified within this new magnetic configuration. Recently, transverse susceptibility (TS) and SANS measurements, performed above the ordering temperature of HoCo2, allowed us to establish the existence of sizable magnetic short-range correlated regions. The correlation length obtained by SANS has an approximately constant value of 7.5 ± 0.7 Ǻ in the region of temperatures close to Tf and increases asymptotically to Tc. An XMCD study reveals the inversion of the Co net magnetization in HoCo2, suggesting that parimagnetism is a more general phenomenon among the heavy lanthanide Co Laves phases. The temperature dependence of Co and Ho moments for different applied fields has been obtained from XMCD measurements, showing that rare earth moment also changes its orientation above Tf, giving rise to an entirely new magnetic configuration at high temperature. Indeed, based on TS measurements and our XMCD study we propose a new magnetic phase diagram for HoCo2. First principles calculations based on LSDA+U approximation have also been performed in HoCo2 to obtain insights on the origin of the Co-short-range correlated volume.
DescripciónResumen del póster presentado a la VII Reunión Grupo Especializado de Física de Estado Sólido celebrado en Sevilla (España) del 25 al 27 de enero de 2012.-- et al.
URIhttp://hdl.handle.net/10261/121927
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