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Magnetic properties of electron-doped LaCoO$$_3$$

Tomiyasu, Keisuke*; Sato, Mika*; Koyama, Shunichi*; Nojima, Tsutomu*; Kajimoto, Ryoichi  ; Ji, S.*; Iwasa, Kazuaki*

We studied electron-doped LaCo$$_{1-y}$$Te$$^{6+}_{y}$$O$$_{3}$$ by magnetization measurements and neutron scattering. The effective Bohr magneton, estimated in the Curie-Weiss fitting around room temperature, is independent of $$y$$. This suggests that magnetic Co$$^{3+mathrm{(HS)}}$$, not nonmagnetic Co$$^{3+mathrm{(LS)}}$$, is mainly replaced by doped magnetic Co$$^{2+mathrm{(HS)}}$$. At the lowest temperatures, a Brillouin-function-like saturating behavior persists in the magnetization curves even in the high-$$y$$ samples, and neither clear magnetic reflection nor magnetic dispersion is observed by neutron scattering. These indicate that magnetic correlation is very weak in contrast to the well-known hole-doped LaCoO$$_3$$ accompanied with the transition to ferromagnetic metal. However, we also found that the low-$$y$$ samples exhibit nonnegligible enhancement in saturated magnetization by $$sim$$2 $$mu_B$$/doped-electron. All these characteristics are discussed in the light of activation and inactivation of spin-state blockade.

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Category:Physics, Multidisciplinary

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