Magnetic structure and magneto-volume anomalies in Er(2)Fe(17) compound
Álvarez Alonso, Pablo
Marcos, Jorge Sánchez
Puente Orench, Inés
Rodríguez Velamazán, José Alberto
Cuello, Gabriel J.
Sánchez Llamazares, José Luis
Blanco Rodríguez, Jesús Angel
"Neutron powder diffraction shows that the intermetallic Er(2)Fe(17) compound with hexagonal crystal structure has a ferrimagnetic ground state (T(C) = 303 K). At T = 5 K the magnetic moments of Fe sublattice (mu similar to 2 mu(B)) are therefore antiparalell to those of the Er one (mu similar to 9 mu(B)), all of them lying on the basal plane. This compound exhibits strong magneto-volume effects up to temperatures in the vicinity of T(C). Neutron thermo-diffraction experiments also show an anomalous temperature dependence of the cell volume, including a negative thermal expansion coefficient below 300 K. In addition, a positive spontaneous volume magnetostriction is observed up to T similar to 400 K, with a maximum (omega(S) similar to 0.02) located at T = 5 K."