Spin-state responses to light impurity substitution in low-spin perovskite LaCoO sub(3)

We studied the spin-state responses to light impurity substitution in low-spin perovskite LaCoO sub(3) (Co super(3+) : d super(6)) through magnetization, x-ray fluorescence, and electrical resistivity measurements of single-crystal LaCo sub(0.99)M sub(0.01)O sub(3) (M = Cr, Mn, Fe, Ni). In the magne...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-06, Vol.87 (22)
Main Authors: Tomiyasu, Keisuke, Kubota, Yuuki, Shimomura, Saya, Onodera, Mitsugi, Koyama, Syun-Ichi, Nojima, Tsutomu, Ishihara, Sumio, Makao, Hironori, Murakami, Youichi
Format: Article
Language:English
Subjects:
Chromium
Condensed matter
Ferromagnetism
Impurities
Iron
Manganese
Nickel
Perovskites
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Summary:We studied the spin-state responses to light impurity substitution in low-spin perovskite LaCoO sub(3) (Co super(3+) : d super(6)) through magnetization, x-ray fluorescence, and electrical resistivity measurements of single-crystal LaCo sub(0.99)M sub(0.01)O sub(3) (M = Cr, Mn, Fe, Ni). In the magnetization curves measured at 1.8 K, a change in the spin-state was not observed for Cr, Mn, or Fe substitution but was observed for Ni substitution. Strong magnetic anisotropy was also found in the Ni-substituted sample. The fluorescence measurements revealed that the valences were roughly estimated to be Cr super(3+), Mn super((4- delta )+), Fe( super(3+ delta )') super(+) , and Ni super(3+). From the observed chemical trends, we propose that the chemical potential is a key factor in inducing the change of the low-spin state. By expanding a model of the ferromagnetic spin-state heptamer generated by hole doping [Podlesnyak et al., Phys. Rev. Lett. 101, 247603 (2008) (http://dx.doi.org/10.1103/PhysRevLett.101.247603)]. the emergence of highly anisotropic spin-state molecular ferromagnets induced by low-spin Ni super(3+) with Jahn-Teller activity is suggested. We also discuss applicability of the present results to other materials with Fe (d super(6)).
ISSN:1098-0121
1550-235X