CaRuO3 is not a paramagnetic material
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Magnetic studies of ceramic and single crystal CaRuO3 samples demonstrate that irreversibility appears in the zero-field-cooled field-cooled curves only when measured at low applied magnetic fields. A small hysteresis loop opens at low temperatures, and the remanent magnetization decreases with temperature and disappears at similar to 90 and 71 K for the ceramic and crystal samples, respectively. The easy axis for the magnetization is in the . Mossbauer studies of 1% Fe-57 doped in CaRuO3 show a magnetic sextet at 4.1 K which disappears at 90 K. It is proposed that CaRuO3 is not paramagnetic, but rather shows the characteristics of short range magnetic interactions, possibly as spin-glass-like behavior. Fe-57 ions experience an exchange field from their magnetic Ru neighbors and also become magnetically ordered.
Извор:Physical Review B: Condensed Matter and Materials Physics, 2000, 62, 17, 11332-11335
ISSN: 1098-0121 (print); 1550-235X (electronic)