The effective magnetic moments of Co2+ and Co3+ in SrTiO3 investigated by temperature-dependent magnetic susceptibility

Yuzki M. Oey; Robert Cava

doi:10.1016/j.materresbull.2019.110667

The effective magnetic moments of Co²⁺ and Co³⁺ in SrTiO₃ investigated by temperature-dependent magnetic susceptibility

Yuzki M. Oey, Robert Cava

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

11 Scopus citations

Abstract

The magnetic behavior of Co²⁺ and Co³⁺ ions doped into a well-known perovskite, SrTiO₃, is investigated. We report the change in the effective magnetic moment of the cobalt ions, based on temperature-dependent magnetic susceptibility measurements, as a function of their formal valence. A low Co content (4%) is chosen to minimize the effects of Co-Co interactions and the co-dopant Nb⁵⁺ is employed to control the Co valence. The materials have formulas SrTi_0.96- _xCo_0.04Nb_xO₃, with x between x = 0.04 (Co³⁺) and x = 0.08 (Co²⁺). Both standard Curie-Weiss analysis and Kotani-type analysis reach the same conclusions: neither Co²⁺ nor Co³⁺ is in a low moment magnetic state when doped into SrTiO₃, and no temperature-induced spin state transitions are observed.

Original language	English (US)
Article number	110667
Journal	Materials Research Bulletin
Volume	122
DOIs	https://doi.org/10.1016/j.materresbull.2019.110667
State	Published - Feb 2020

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Keywords

Cobalt spin state transition
Perovskite
Strontium titanate
Temperature-dependent magnetic susceptibility

Access to Document

10.1016/j.materresbull.2019.110667

Cite this

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title = "The effective magnetic moments of Co2+ and Co3+ in SrTiO3 investigated by temperature-dependent magnetic susceptibility",

abstract = "The magnetic behavior of Co2+ and Co3+ ions doped into a well-known perovskite, SrTiO3, is investigated. We report the change in the effective magnetic moment of the cobalt ions, based on temperature-dependent magnetic susceptibility measurements, as a function of their formal valence. A low Co content (4%) is chosen to minimize the effects of Co-Co interactions and the co-dopant Nb5+ is employed to control the Co valence. The materials have formulas SrTi0.96- xCo0.04NbxO3, with x between x = 0.04 (Co3+) and x = 0.08 (Co2+). Both standard Curie-Weiss analysis and Kotani-type analysis reach the same conclusions: neither Co2+ nor Co3+ is in a low moment magnetic state when doped into SrTiO3, and no temperature-induced spin state transitions are observed.",

keywords = "Cobalt spin state transition, Perovskite, Strontium titanate, Temperature-dependent magnetic susceptibility",

author = "Oey, {Yuzki M.} and Robert Cava",

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year = "2020",

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doi = "10.1016/j.materresbull.2019.110667",

language = "English (US)",

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T1 - The effective magnetic moments of Co2+ and Co3+ in SrTiO3 investigated by temperature-dependent magnetic susceptibility

AU - Oey, Yuzki M.

AU - Cava, Robert

PY - 2020/2

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N2 - The magnetic behavior of Co2+ and Co3+ ions doped into a well-known perovskite, SrTiO3, is investigated. We report the change in the effective magnetic moment of the cobalt ions, based on temperature-dependent magnetic susceptibility measurements, as a function of their formal valence. A low Co content (4%) is chosen to minimize the effects of Co-Co interactions and the co-dopant Nb5+ is employed to control the Co valence. The materials have formulas SrTi0.96- xCo0.04NbxO3, with x between x = 0.04 (Co3+) and x = 0.08 (Co2+). Both standard Curie-Weiss analysis and Kotani-type analysis reach the same conclusions: neither Co2+ nor Co3+ is in a low moment magnetic state when doped into SrTiO3, and no temperature-induced spin state transitions are observed.

AB - The magnetic behavior of Co2+ and Co3+ ions doped into a well-known perovskite, SrTiO3, is investigated. We report the change in the effective magnetic moment of the cobalt ions, based on temperature-dependent magnetic susceptibility measurements, as a function of their formal valence. A low Co content (4%) is chosen to minimize the effects of Co-Co interactions and the co-dopant Nb5+ is employed to control the Co valence. The materials have formulas SrTi0.96- xCo0.04NbxO3, with x between x = 0.04 (Co3+) and x = 0.08 (Co2+). Both standard Curie-Weiss analysis and Kotani-type analysis reach the same conclusions: neither Co2+ nor Co3+ is in a low moment magnetic state when doped into SrTiO3, and no temperature-induced spin state transitions are observed.

KW - Cobalt spin state transition

KW - Perovskite

KW - Strontium titanate

KW - Temperature-dependent magnetic susceptibility

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