Effect of optical f-f excitations on the Nd-Fe exchange interaction in Nd ferroborate with multiferroic properties

Vladimir A. Gavrichkov; Alexandr V. Malakhovskii; Sergey G. Ovchinnikov

doi:10.1103/physrevb.104.064445

Effect of optical f-f excitations on the Nd-Fe exchange interaction in Nd ferroborate with multiferroic properties

Vladimir A. Gavrichkov
, Alexandr V. Malakhovskii
, Sergey G. Ovchinnikov

RAS - Kirensky Institute of Physics, Siberian Branch

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

1 Scopus citations

Abstract

We considered the effect of optical pumping at the f-f transitions frequency on d-f superexchange in the rare-earth antiferromagnetic ferroborate Nd0.5Gd0.5Fe3(BO3)4 between Nd3+ ions in the excited states of the 4G5/2, 2G7/2, and Fe3+ in the ground state 6A1. In the ferroborate, d-f superexchange is directly related to the strong magnetoelectric coupling observed in the ground state of the material. We show that under optical pumping at the frequency of f-f transitions 4I9/2↔(4G5/2+2G7/2) in the Nd3+ ion, the nature of the d-f interaction changes to FM. The phenomena can be explained by the occupation of the excited Nd3+ "spin pure"states with spin 1/2, or their mixing to the optically excited states with spin 3/2 due to the spin-orbit interaction. Near optically excited ions Nd3+, magnetic frustrations change from FM ordering under the d-f AFM interaction to AFM ordering under the FM interaction in the basal hexagonal plane.

Original language	English
Article number	064445
Journal	Physical Review B
Volume	104
Issue number	6
DOIs	https://doi.org/10.1103/physrevb.104.064445
State	Published - 1 Aug 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 American Physical Society.

Funding

The reported study was supported by the RFBR Grant 19-02-00034. V.A.G. is also grateful to the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science according to the research project “Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials” No. 20-42-240016.

Funders	Funder number
Russian Foundation for Basic Research	19-02-00034, 20-42-240016

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10.1103/physrevb.104.064445

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title = "Effect of optical f-f excitations on the Nd-Fe exchange interaction in Nd ferroborate with multiferroic properties",

abstract = "We considered the effect of optical pumping at the f-f transitions frequency on d-f superexchange in the rare-earth antiferromagnetic ferroborate Nd0.5Gd0.5Fe3(BO3)4 between Nd3+ ions in the excited states of the 4G5/2, 2G7/2, and Fe3+ in the ground state 6A1. In the ferroborate, d-f superexchange is directly related to the strong magnetoelectric coupling observed in the ground state of the material. We show that under optical pumping at the frequency of f-f transitions 4I9/2↔(4G5/2+2G7/2) in the Nd3+ ion, the nature of the d-f interaction changes to FM. The phenomena can be explained by the occupation of the excited Nd3+ {"}spin pure{"}states with spin 1/2, or their mixing to the optically excited states with spin 3/2 due to the spin-orbit interaction. Near optically excited ions Nd3+, magnetic frustrations change from FM ordering under the d-f AFM interaction to AFM ordering under the FM interaction in the basal hexagonal plane.",

author = "Gavrichkov, \{Vladimir A.\} and Malakhovskii, \{Alexandr V.\} and Ovchinnikov, \{Sergey G.\}",

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doi = "10.1103/physrevb.104.064445",

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PY - 2021/8/1

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N2 - We considered the effect of optical pumping at the f-f transitions frequency on d-f superexchange in the rare-earth antiferromagnetic ferroborate Nd0.5Gd0.5Fe3(BO3)4 between Nd3+ ions in the excited states of the 4G5/2, 2G7/2, and Fe3+ in the ground state 6A1. In the ferroborate, d-f superexchange is directly related to the strong magnetoelectric coupling observed in the ground state of the material. We show that under optical pumping at the frequency of f-f transitions 4I9/2↔(4G5/2+2G7/2) in the Nd3+ ion, the nature of the d-f interaction changes to FM. The phenomena can be explained by the occupation of the excited Nd3+ "spin pure"states with spin 1/2, or their mixing to the optically excited states with spin 3/2 due to the spin-orbit interaction. Near optically excited ions Nd3+, magnetic frustrations change from FM ordering under the d-f AFM interaction to AFM ordering under the FM interaction in the basal hexagonal plane.

AB - We considered the effect of optical pumping at the f-f transitions frequency on d-f superexchange in the rare-earth antiferromagnetic ferroborate Nd0.5Gd0.5Fe3(BO3)4 between Nd3+ ions in the excited states of the 4G5/2, 2G7/2, and Fe3+ in the ground state 6A1. In the ferroborate, d-f superexchange is directly related to the strong magnetoelectric coupling observed in the ground state of the material. We show that under optical pumping at the frequency of f-f transitions 4I9/2↔(4G5/2+2G7/2) in the Nd3+ ion, the nature of the d-f interaction changes to FM. The phenomena can be explained by the occupation of the excited Nd3+ "spin pure"states with spin 1/2, or their mixing to the optically excited states with spin 3/2 due to the spin-orbit interaction. Near optically excited ions Nd3+, magnetic frustrations change from FM ordering under the d-f AFM interaction to AFM ordering under the FM interaction in the basal hexagonal plane.

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Effect of optical f-f excitations on the Nd-Fe exchange interaction in Nd ferroborate with multiferroic properties

Abstract

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