Spin-state responses to light impurity doping in low-spin perovskite LaCoO${}_3$

Abstract

We studied the spin-state responses to light impurity doping in low-spin perovskite LaCoO${}_3$ (Co^3+: d^6) through magnetization and X-ray fluorescence measurements of single-crystal LaCo${}_{0.99}$$M_{0.01}$O${}_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 doping but was observed for Ni doping. Strong magnetic anisotropy along the [100] easy axis was also found in the Ni-doped sample. The fluorescence measurements revealed that the valences were roughly estimated to be Cr^3+, Mn^4+, Fe^(3+delta)+, and Ni^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, we discuss the emergence of highly anisotropic ferromagnetic spin-state clusters induced by low-spin Ni^3+ with Jahn-Teller activity. We also discuss applicability of the present results to mantle materials and impurity-doped pyrites with Fe (d^6).

8 pages, 5 figures, 1 table

References in corpus (5)

• Discovery of Griffiths phase in itinerant magnetic semiconductor Fe_{1-x}Co_xS_2
• Spin-state polaron in lightly hole-doped LaCoO_3
• Effect of carrier doping on the formation and collapse of magnetic polarons in lightly hole-doped La_{1-x}Sr_xCoO_3
• Stabilization of the high-spin state of Co${}^{3+}$ in LaCo${}_{1-x}$Rh${}_x$O${}_3$
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Cited by in corpus (2)

• Anomalous magnetic and spin glass behavior in Nb substituted LaCo${}_{1-x}$Nb${}_x$O${}_3$
• Symmetry-resolved elastic anomalies in spin-crossover cobaltite LaCoO${}_3$