期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 14, 期 31, 页码 7391-7398出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/14/31/310
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The doping of SrRuO3 at the Ru sites with various cations was investigated, controlling the oxygen composition in sealed tubes (STs). For these ST samples SrRu1-xMxO3, it is shown that doping with cations containing e(g) electrons, M = Zn2+, Ni2+, Co2+, Mn3+, decreases T-C significantly from 166 K for SrRuO3 down to 105 K, whereas in contrast, doping with Cr3+ which contains only t(2g) electrons increases T-C up to 188 K. All these samples exhibit negative magnetoresistance, showing a maximum effect close to T-C. By synthesizing the samples in air, it is shown that the resistivity of these oxides is significantly modified, showing an upturn at low temperature and a disappearance of the metal to metal transition, whereas the magnetic behaviour is practically unchanged. This modification of the transport properties is believed to be due to a variation of the oxygen stoichiometry at the grain boundary.
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