Spontaneous and field-induced magnetic transitions in YBaCo2O5.5

V. Bobrovskii; V. Kazantsev; A. Mirmelstein; N. Mushnikov; N. Proskurnina; V. Voronin; E. Pomjakushina; K. Conder; A. Podlesnyak

doi:10.1016/j.jmmm.2008.09.030

Spontaneous and field-induced magnetic transitions in YBaCo₂O_5.5

V. Bobrovskii, V. Kazantsev, A. Mirmelstein, N. Mushnikov, N. Proskurnina, V. Voronin, E. Pomjakushina, K. Conder, A. Podlesnyak

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

8 Scopus citations

Abstract

A detailed study of magnetic properties of cobaltite YBaCo₂O_5.5 has been performed in high (up to 35 T) magnetic fields and under hydrostatic pressure up to 0.8 GPa. The temperatures of paramagnet-ferromagnet (PM-FM) and ferromagnet-antiferromagnet (FM-AF) phase transitions and their pressure derivatives have been determined. It has been revealed that in the compound with yttrium, in contrast to those with magnetic rare earth atoms, the AF-FM field-induced magnetic phase transition is accompanied by a considerable field hysteresis below 240 K, and the magnetic field of 35 T is not sufficient to complete this transition at low temperatures. The hysteresis value depends on the magnetic field sweep rate, which considered as an evidence of magnetic viscosity that is especially strong in the region of coexistence of the FM and AF phases. High values of susceptibility for the field-induced FM phase show that Co spin state in these compounds changes in strong magnetic field.

Original language	English
Pages (from-to)	429-437
Number of pages	9
Journal	Journal of Magnetism and Magnetic Materials
Volume	321
Issue number	5
DOIs	https://doi.org/10.1016/j.jmmm.2008.09.030
State	Published - Mar 2009
Externally published	Yes

Funding

This work is supported by the Swiss National Science Foundation through Grant SCOPES IB7320-110895; by the RAS Priority Program “Quantum Macrophysics” (Project no. 3 of the RAS Ural Branch). ORNL/SNS is managed by UT-Battelle, LLC, for the US Department of Energy under Contract DE-AC05-00OR22725.

Funders	Funder number
RAS Ural Branch
US Department of Energy	DE-AC05-00OR22725
Royal Astronomical Society
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	SCOPES IB7320-110895

Keywords

Cobaltite
Metamagnetic transition
Pressure effect

Access to Document

10.1016/j.jmmm.2008.09.030

Cite this

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title = "Spontaneous and field-induced magnetic transitions in YBaCo2O5.5",

abstract = "A detailed study of magnetic properties of cobaltite YBaCo2O5.5 has been performed in high (up to 35 T) magnetic fields and under hydrostatic pressure up to 0.8 GPa. The temperatures of paramagnet-ferromagnet (PM-FM) and ferromagnet-antiferromagnet (FM-AF) phase transitions and their pressure derivatives have been determined. It has been revealed that in the compound with yttrium, in contrast to those with magnetic rare earth atoms, the AF-FM field-induced magnetic phase transition is accompanied by a considerable field hysteresis below 240 K, and the magnetic field of 35 T is not sufficient to complete this transition at low temperatures. The hysteresis value depends on the magnetic field sweep rate, which considered as an evidence of magnetic viscosity that is especially strong in the region of coexistence of the FM and AF phases. High values of susceptibility for the field-induced FM phase show that Co spin state in these compounds changes in strong magnetic field.",

keywords = "Cobaltite, Metamagnetic transition, Pressure effect",

author = "V. Bobrovskii and V. Kazantsev and A. Mirmelstein and N. Mushnikov and N. Proskurnina and V. Voronin and E. Pomjakushina and K. Conder and A. Podlesnyak",

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AU - Bobrovskii, V.

AU - Kazantsev, V.

AU - Mirmelstein, A.

AU - Mushnikov, N.

AU - Proskurnina, N.

AU - Voronin, V.

AU - Pomjakushina, E.

AU - Conder, K.

AU - Podlesnyak, A.

PY - 2009/3

Y1 - 2009/3

N2 - A detailed study of magnetic properties of cobaltite YBaCo2O5.5 has been performed in high (up to 35 T) magnetic fields and under hydrostatic pressure up to 0.8 GPa. The temperatures of paramagnet-ferromagnet (PM-FM) and ferromagnet-antiferromagnet (FM-AF) phase transitions and their pressure derivatives have been determined. It has been revealed that in the compound with yttrium, in contrast to those with magnetic rare earth atoms, the AF-FM field-induced magnetic phase transition is accompanied by a considerable field hysteresis below 240 K, and the magnetic field of 35 T is not sufficient to complete this transition at low temperatures. The hysteresis value depends on the magnetic field sweep rate, which considered as an evidence of magnetic viscosity that is especially strong in the region of coexistence of the FM and AF phases. High values of susceptibility for the field-induced FM phase show that Co spin state in these compounds changes in strong magnetic field.

AB - A detailed study of magnetic properties of cobaltite YBaCo2O5.5 has been performed in high (up to 35 T) magnetic fields and under hydrostatic pressure up to 0.8 GPa. The temperatures of paramagnet-ferromagnet (PM-FM) and ferromagnet-antiferromagnet (FM-AF) phase transitions and their pressure derivatives have been determined. It has been revealed that in the compound with yttrium, in contrast to those with magnetic rare earth atoms, the AF-FM field-induced magnetic phase transition is accompanied by a considerable field hysteresis below 240 K, and the magnetic field of 35 T is not sufficient to complete this transition at low temperatures. The hysteresis value depends on the magnetic field sweep rate, which considered as an evidence of magnetic viscosity that is especially strong in the region of coexistence of the FM and AF phases. High values of susceptibility for the field-induced FM phase show that Co spin state in these compounds changes in strong magnetic field.

KW - Cobaltite

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KW - Pressure effect

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