Pressure effects on crystal structure, magnetic and transport properties of layered perovskite TbBaCo2 O5.5

A. Podlesnyak; S. Streule; K. Conder; E. Pomjakushina; J. Mesot; A. Mirmelstein; P. Schützendorf; R. Lengsdorf; M. M. Abd-Elmeguid

doi:10.1016/j.physb.2006.01.405

Pressure effects on crystal structure, magnetic and transport properties of layered perovskite TbBaCo₂ O_5.5

A. Podlesnyak, S. Streule, K. Conder, E. Pomjakushina, J. Mesot, A. Mirmelstein, P. Schützendorf, R. Lengsdorf, M. M. Abd-Elmeguid

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

14 Scopus citations

Abstract

The complex behavior of the RBaCo₂ O_5.5 perovskites, which include a metal-insulator (MI) as well as successive magnetic ( PM → FM → AFM) transitions, is suggested to be related to an interplay between spin, charge and orbital degrees of freedom of the Co^{3 +} ions. We have investigated the effect of pressure on the structural, magnetic and electronic properties of TbBaCo₂ O_5.5 by means of neutron powder diffraction ( p = 1.2 GPa), magnetization ( p = 1.2 GPa), and resistivity measurements ( p = 2.6 GPa), respectively. Contrary to the results reported on conventional (La,Sr) CoO₃ perovskites, we find that the pressure coefficients of the transition temperatures T_N, T_C, as well as T_MI are rather small ( < 1 K / GPa), suggesting a weak change of the spin states at the MI transition. We further show, that pressure and temperature have different effects on the volumes of the CoO₆ octahedron and CoO₅ pyramid in the layered double-perovskite.

Original language	English
Pages (from-to)	537-538
Number of pages	2
Journal	Physica B: Physics of Condensed Matter
Volume	378-380
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physb.2006.01.405
State	Published - May 1 2006
Externally published	Yes

Funding

The authors are grateful to V. Pomjakushin for his help with NPD measurements and Yu. Chernenkov for stimulating discussions. The experiments have been partly performed at the Swiss Spallation Neutron Source, Paul Scherrer Institute, Villigen, Switzerland. The work was supported by Swiss National Science Foundation through Grants 200021–100194, SCOPES IB7320-110859/1, NCCR MaNEP project, and the Deutsche Forschungsgemeinschaft through SFB 608.

Funders	Funder number
Deutsche Forschungsgemeinschaft	SFB 608
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	200021–100194, IB7320-110859/1

Keywords

Cobaltites
Phase transition
Pressure

Access to Document

10.1016/j.physb.2006.01.405

Cite this

Podlesnyak, A., Streule, S., Conder, K., Pomjakushina, E., Mesot, J., Mirmelstein, A., Schützendorf, P., Lengsdorf, R., & Abd-Elmeguid, M. M. (2006). Pressure effects on crystal structure, magnetic and transport properties of layered perovskite TbBaCo₂ O_5.5. Physica B: Physics of Condensed Matter, 378-380(SPEC. ISS.), 537-538. https://doi.org/10.1016/j.physb.2006.01.405

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abstract = "The complex behavior of the RBaCo2 O5.5 perovskites, which include a metal-insulator (MI) as well as successive magnetic ( PM → FM → AFM) transitions, is suggested to be related to an interplay between spin, charge and orbital degrees of freedom of the Co3 + ions. We have investigated the effect of pressure on the structural, magnetic and electronic properties of TbBaCo2 O5.5 by means of neutron powder diffraction ( p = 1.2 GPa), magnetization ( p = 1.2 GPa), and resistivity measurements ( p = 2.6 GPa), respectively. Contrary to the results reported on conventional (La,Sr) CoO3 perovskites, we find that the pressure coefficients of the transition temperatures TN, TC, as well as TMI are rather small ( < 1 K / GPa), suggesting a weak change of the spin states at the MI transition. We further show, that pressure and temperature have different effects on the volumes of the CoO6 octahedron and CoO5 pyramid in the layered double-perovskite.",

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Podlesnyak, A, Streule, S, Conder, K, Pomjakushina, E, Mesot, J, Mirmelstein, A, Schützendorf, P, Lengsdorf, R & Abd-Elmeguid, MM 2006, 'Pressure effects on crystal structure, magnetic and transport properties of layered perovskite TbBaCo₂ O_5.5', Physica B: Physics of Condensed Matter, vol. 378-380, no. SPEC. ISS., pp. 537-538. https://doi.org/10.1016/j.physb.2006.01.405

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T1 - Pressure effects on crystal structure, magnetic and transport properties of layered perovskite TbBaCo2 O5.5

AU - Podlesnyak, A.

AU - Streule, S.

AU - Conder, K.

AU - Pomjakushina, E.

AU - Mesot, J.

AU - Mirmelstein, A.

AU - Schützendorf, P.

AU - Lengsdorf, R.

AU - Abd-Elmeguid, M. M.

PY - 2006/5/1

Y1 - 2006/5/1

N2 - The complex behavior of the RBaCo2 O5.5 perovskites, which include a metal-insulator (MI) as well as successive magnetic ( PM → FM → AFM) transitions, is suggested to be related to an interplay between spin, charge and orbital degrees of freedom of the Co3 + ions. We have investigated the effect of pressure on the structural, magnetic and electronic properties of TbBaCo2 O5.5 by means of neutron powder diffraction ( p = 1.2 GPa), magnetization ( p = 1.2 GPa), and resistivity measurements ( p = 2.6 GPa), respectively. Contrary to the results reported on conventional (La,Sr) CoO3 perovskites, we find that the pressure coefficients of the transition temperatures TN, TC, as well as TMI are rather small ( < 1 K / GPa), suggesting a weak change of the spin states at the MI transition. We further show, that pressure and temperature have different effects on the volumes of the CoO6 octahedron and CoO5 pyramid in the layered double-perovskite.

AB - The complex behavior of the RBaCo2 O5.5 perovskites, which include a metal-insulator (MI) as well as successive magnetic ( PM → FM → AFM) transitions, is suggested to be related to an interplay between spin, charge and orbital degrees of freedom of the Co3 + ions. We have investigated the effect of pressure on the structural, magnetic and electronic properties of TbBaCo2 O5.5 by means of neutron powder diffraction ( p = 1.2 GPa), magnetization ( p = 1.2 GPa), and resistivity measurements ( p = 2.6 GPa), respectively. Contrary to the results reported on conventional (La,Sr) CoO3 perovskites, we find that the pressure coefficients of the transition temperatures TN, TC, as well as TMI are rather small ( < 1 K / GPa), suggesting a weak change of the spin states at the MI transition. We further show, that pressure and temperature have different effects on the volumes of the CoO6 octahedron and CoO5 pyramid in the layered double-perovskite.

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