Itinerant-to-localized electron transition in CaRu{sub 1{minus}{ital x}}Sn{sub {ital x}}O{sub 3} and SrRu{sub 1{minus}{ital x}}Pb{sub {ital x}}O{sub 3}
- National High Magnetic Field Laboratory, Tallahassee, Florida 32306 (United States)
- Temple University, Philadelphia, Pennsylvania 19122 (United States)
SrRuO{sub 3} and CaRuO{sub 3} are perovskites with an orthorhombic distortion and are believed to have a narrow itinerant band. SrRuO{sub 3} is the only known ferromagnetic conductor in 4{ital d} transition-metal oxides, while CaRuO{sub 3} is a paramagnetic conductor. Substituting Pb and Sn for Ru in SrRuO{sub 3} and CaRuO{sub 3}, respectively, preserves the crystal structure, while removing electrons from the 4{ital d} band, resulting in an itinerant-to-localized electron transition and also substantially altering the magnetic coupling, giving rise to a new magnetically ordered phase. In particular, it appears that the paramagnetic CaRuO{sub 3} is on the verge of magnetic ordering and readily evolves into a magnetically ordered phase when slightly doped with Sn (4{endash}10{percent}). Such an ordered phase is not stable and disappears when Sn concentration is higher than 10{percent}. On the other hand, the Curie temperature ({ital T}{sub {ital C}}=165 K) of SrRuO{sub 3} seems to be sensitive to Pb doping, and increases to 210 K when the Pb concentration in the compound is higher than 30{percent}. For both SrRuO{sub 3} and CaRuO{sub 3} the transition to the magnetic state is accompanied by an itinerant-to-localized electron transition due to the 4{ital d}-electron depletion. These results are based on measurements of magnetic susceptibility and electrical resistivity. This study reveals striking observations which underscore the importance of the interplay between the conduction band and (anti)ferromagnetism. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 397606
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 54, Issue 21; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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