We report on an experimental investigation of the magnetic and structural properties of the Y2-xZnxRu2O7 pyrochlore system as a function of the Zn doping in the range 0.00 ≤ x ≤ 0.20. Magnetization and muon spin relaxation measurements show that the antiferromagnetic transition typical of the undoped compound at TN = 77 K is slightly reduced and broadened in the Zn doped sample. Extended X-ray absorption fine structure measurements show a peak in the Ru-O(1) first shell Debye-Waller factor at a temperature TDW ≈ TN, giving evidence for a strong magnetoelastic coupling detected up to x = 0.10. A local precursor order-disorder transition at T∗ > TN is also observed up to x = 0.10. For x > 0.10 these local structural features are hidden due to the increasing local lattice distortion induced by the Zn2+ dopant whereas the magnetic transition is still present.
Evidence of a correlation between magnetic and structural transitions in Y2-xZnxRu2O7 pyrochlore compounds / Berti, Giulia; Sanna, Samuele; Ruiz Bustos, Rocío; Van Duijn, Joost; Brambilla, Alberto; Muñoz Noval, Álvaro; Demartin, Francesco; Duò, Lamberto; Castellano, Carlo. - In: RSC ADVANCES. - ISSN 2046-2069. - STAMPA. - 5:122(2015), pp. 100809-100815. [10.1039/c5ra20878e]
Evidence of a correlation between magnetic and structural transitions in Y2-xZnxRu2O7 pyrochlore compounds
SANNA, SAMUELE;
2015
Abstract
We report on an experimental investigation of the magnetic and structural properties of the Y2-xZnxRu2O7 pyrochlore system as a function of the Zn doping in the range 0.00 ≤ x ≤ 0.20. Magnetization and muon spin relaxation measurements show that the antiferromagnetic transition typical of the undoped compound at TN = 77 K is slightly reduced and broadened in the Zn doped sample. Extended X-ray absorption fine structure measurements show a peak in the Ru-O(1) first shell Debye-Waller factor at a temperature TDW ≈ TN, giving evidence for a strong magnetoelastic coupling detected up to x = 0.10. A local precursor order-disorder transition at T∗ > TN is also observed up to x = 0.10. For x > 0.10 these local structural features are hidden due to the increasing local lattice distortion induced by the Zn2+ dopant whereas the magnetic transition is still present.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
