Magnetic interactions in (Pr, La)₃RuO₇ and Pr₃(Ru, Nb)O₇

Authors: Zhou Z.X.; Cao G.; McCall S.; Crow J.E.; Guertin R.P.; Mielke C.H.; Rickel D.G.

Source: Philosophical Magazine B, Volume 82, Number 13, 1 September 2002 , pp. 1401-1412(12)

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Abstract:

The rare-earth ruthenate Pr₃RuO₇ is a Mott insulator displaying magnetic ordering at two temperatures T_N1 = 36 K and T_N2 = 55 K. By substituting diamagnetic La for Pr and diamagnetic Nb for Ru, T_N1 is shown to be associated with ordering among the rare earths and T_N2 among the Ru cations. These results are similar to those of Sm₃RuO₇, but the ordering temperatures for Pr₃RuO₇ are large compared with all other known Ln₃MO₇ systems and there is less divergence between field-cooled and zero-field-cooled magnetic susceptibility for T < T_N2. Isothermal magnetization measurements, including pulsed-field measurements, show hysteretic-field-induced transitions at B

4T for T << T_N1 associated with a spin reorientation of the Pr moments. Further characterization of Pr₃RuO₇ is provided from measurements of the heat capacity for 2 K < T < 17 K and electrical resistivity for 100 K < T < 300 K.

Language: English

Document Type: Research article

Publication date: 2002-09-01

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