Effect of light Sr doping on the spin-state transition in LaCoO3

A. Podlesnyak; K. Conder; E. Pomjakushina; A. Mirmelstein; P. Allenspach; D. I. Khomskii

doi:10.1016/j.jmmm.2006.10.901

Effect of light Sr doping on the spin-state transition in LaCoO₃

A. Podlesnyak, K. Conder, E. Pomjakushina, A. Mirmelstein, P. Allenspach, D. I. Khomskii

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

We present an inelastic neutron scattering study of the low energy crystal-field excitations in the lightly doped cobalt perovskite La_0.998 Sr_0.002 CoO₃. In contrast to the parent compound LaCoO₃ an inelastic peak at energy transfer ∼ 0.75 meV was found at temperatures below 30 K. This excitation apparently corresponds to a transition between a ground state orbital singlet and a higher excited orbital doublet, originating from a high-spin triplet split by a small trigonal crystal field. Another inelastic peak at an energy transfer ∼ 0.6 meV was found at intermediate temperatures starting from T > 30 K. This confirms the presence of a thermally induced spin-state transition from the low-spin Co^{3 +} to a magnetic high-spin state in the non-disturbed LaCoO₃ matrix. We suggest that hole doping of LaCoO₃ leads to the creation of a magnetic polaron and hence to the low-to-high spin state transition on the relevant Co sites.

Original language	English
Pages (from-to)	1552-1554
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 2
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.901
State	Published - Mar 2007
Externally published	Yes

Funding

The authors thank D. N. Argyriou for fruitful discussions. This work is based on experiments performed at the Swiss spallation neutron source SINQ, Paul Scherrer Institute, Villigen, Switzerland. We are indebted to the Swiss National Science Foundation for financial support through grant SCOPES IB7320-110859/1 and NCCR MaNEP project.

Keywords

Cobaltites
Inelastic neutron scattering
Spin-state transitions

Access to Document

10.1016/j.jmmm.2006.10.901

Cite this

@article{97156dc40f944116ae1dd23000b4014d,

title = "Effect of light Sr doping on the spin-state transition in LaCoO3",

abstract = "We present an inelastic neutron scattering study of the low energy crystal-field excitations in the lightly doped cobalt perovskite La0.998 Sr0.002 CoO3. In contrast to the parent compound LaCoO3 an inelastic peak at energy transfer ∼ 0.75 meV was found at temperatures below 30 K. This excitation apparently corresponds to a transition between a ground state orbital singlet and a higher excited orbital doublet, originating from a high-spin triplet split by a small trigonal crystal field. Another inelastic peak at an energy transfer ∼ 0.6 meV was found at intermediate temperatures starting from T > 30 K. This confirms the presence of a thermally induced spin-state transition from the low-spin Co3 + to a magnetic high-spin state in the non-disturbed LaCoO3 matrix. We suggest that hole doping of LaCoO3 leads to the creation of a magnetic polaron and hence to the low-to-high spin state transition on the relevant Co sites.",

keywords = "Cobaltites, Inelastic neutron scattering, Spin-state transitions",

author = "A. Podlesnyak and K. Conder and E. Pomjakushina and A. Mirmelstein and P. Allenspach and Khomskii, \{D. I.\}",

year = "2007",

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TY - JOUR

T1 - Effect of light Sr doping on the spin-state transition in LaCoO3

AU - Podlesnyak, A.

AU - Conder, K.

AU - Pomjakushina, E.

AU - Mirmelstein, A.

AU - Allenspach, P.

AU - Khomskii, D. I.

PY - 2007/3

Y1 - 2007/3

N2 - We present an inelastic neutron scattering study of the low energy crystal-field excitations in the lightly doped cobalt perovskite La0.998 Sr0.002 CoO3. In contrast to the parent compound LaCoO3 an inelastic peak at energy transfer ∼ 0.75 meV was found at temperatures below 30 K. This excitation apparently corresponds to a transition between a ground state orbital singlet and a higher excited orbital doublet, originating from a high-spin triplet split by a small trigonal crystal field. Another inelastic peak at an energy transfer ∼ 0.6 meV was found at intermediate temperatures starting from T > 30 K. This confirms the presence of a thermally induced spin-state transition from the low-spin Co3 + to a magnetic high-spin state in the non-disturbed LaCoO3 matrix. We suggest that hole doping of LaCoO3 leads to the creation of a magnetic polaron and hence to the low-to-high spin state transition on the relevant Co sites.

AB - We present an inelastic neutron scattering study of the low energy crystal-field excitations in the lightly doped cobalt perovskite La0.998 Sr0.002 CoO3. In contrast to the parent compound LaCoO3 an inelastic peak at energy transfer ∼ 0.75 meV was found at temperatures below 30 K. This excitation apparently corresponds to a transition between a ground state orbital singlet and a higher excited orbital doublet, originating from a high-spin triplet split by a small trigonal crystal field. Another inelastic peak at an energy transfer ∼ 0.6 meV was found at intermediate temperatures starting from T > 30 K. This confirms the presence of a thermally induced spin-state transition from the low-spin Co3 + to a magnetic high-spin state in the non-disturbed LaCoO3 matrix. We suggest that hole doping of LaCoO3 leads to the creation of a magnetic polaron and hence to the low-to-high spin state transition on the relevant Co sites.

KW - Cobaltites

KW - Inelastic neutron scattering

KW - Spin-state transitions

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DO - 10.1016/j.jmmm.2006.10.901

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JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2 SUPPL. PART 2

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