Rigorous ESR spectroscopy of $Fe^{3+}$ impurity ion with oxygen vacancy in ferroelectric $SrTiO_3$ crystal at 20 mK

M. A. Hosain; J-M. Le Floch; J. Krupka; M. E. Tobar

doi:10.1088/1361-648X/aacc05

paper

Rigorous ESR spectroscopy of $F e^{3 +}$ impurity ion with oxygen vacancy in ferroelectric $S r T i O_{3}$ crystal at 20 mK

arXiv:2403.16299 · doi:10.1088/1361-648X/aacc05

Abstract

Impurity $F e^{3 +}$ ion electron spin resonance (ESR) spectroscopy using multiple dielectric modes in a $S r T i O_{3}$ dielectric resonator has been performed with a tuneable DC magnetic field of up to $1.6 T$ . The $T i^{4 +} (d^{0})$ ion is substituted by $F e^{3 +}$ ion forming $F e O_{6}$ octahedral complex with an iron-oxygen-vacancy $(F e^{3 +} - V_{O})$ . In such a metal-ligand complex, a giant g-factor of $g_{∥ F} = 5.51$ was observed in the ferroelectric phase at $20 m K$ . The the change of $F e^{3 +}$ ion center-symmetry in the $F e O_{6}$ complex as a soft-mode characteristics of ferroelectric phase transition and the influences of iron-oxygen-vacancy $(F e^{3 +} - V_{O})$ , interactively sensitive to asymmetry in the octahedral rotational parameter $Φ$ in $S r T i 0_{3}$ .

Rigorous ESR spectroscopy of Fe3+ impurity ion with oxygen vacancy in ferroelectric SrTiO3​ crystal at 20 mK

Abstract

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Rigorous ESR spectroscopy of $F e^{3 +}$ impurity ion with oxygen vacancy in ferroelectric $S r T i O_{3}$ crystal at 20 mK