Spin transitions of Co ions in RCoO3 (R=Gd,Tb) investigated by measuring the electric field gradient at R and Co sites

被引：0

作者：

Carbonari, A.W. ^{[1
]}

Cavalcante, F.H.M. ^{[1
]}

Malavasi, R.F.L. ^{[1
]}

Cabrera-Pasca, G.A. ^{[1
]}

Mestnik-Filho, J. ^{[1
]}

Saxena, R.N. ^{[1
]}

机构：

[1] Instituto de Pesquisas Enerǵticas e Nucleares, IPEN-CNEN/SP, São Paulo 05508000, Brazil

来源：

Journal of Applied Physics | 2008年 / 103卷 / 07期

关键词：

Hyperfine interactions in perovskite-structure RCo O3 (R=Gd; Tb) compounds have been measured by perturbed angular correlation technique using Cd111 and Ta181 nuclear probes. The electric quadrupole interactions at Cd111 show two different sites; assigned to probe substituting Gd or Tb and Co atoms. The temperature dependence of quadrupole frequencies shows discontinuities which have been interpreted as thermally activated spin-state transitions from low-spin ground state configuration to the intermediate-spin (IS) state and from IS state to high-spin state of Co3+ ion. For Ta181 only one major interaction was observed; which was assigned to probe at Co sites. Indication of a Jahn-Teller distortion; which stabilizes the intermediate-spin state with orbital ordering; is also pointed out. © 2008 American Institute of Physics;

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摘要：

Conference article (CA)

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