Spin-state responses to light impurity substitution in low-spin perovskite LaCoO3

Keisuke Tomiyasu, Yuuki Kubota, Saya Shimomura, Mitsugi Onodera, Syun Ichi Koyama, Tsutomu Nojima, Sumio Ishihara, Hironori Nakao, Youichi Murakami

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7 Citations (Scopus)

Abstract

We studied the spin-state responses to light impurity substitution in low-spin perovskite LaCoO3 (Co3+: d6) through magnetization, x-ray fluorescence, and electrical resistivity measurements of single-crystal LaCo0.99M0.01O3 (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 Cr3+, Mn(4-δ )+, Fe(3+δ ′)+, and Ni3+. 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, Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett.101.247603 101, 247603 (2008)], the emergence of highly anisotropic spin-state molecular ferromagnets induced by low-spin Ni3+ with Jahn-Teller activity is suggested. We also discuss applicability of the present results to other materials with Fe (d6).

Original languageEnglish
Article number224409
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number22
DOIs
Publication statusPublished - 2013 Jun 12

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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