EPR study of Mn-implanted single crystal plates of TiO2 rutile

Güler, Sümeyra; Rameev, B.; Хайбуллин, Р. И.; Lopatin, O. N.; Aktaş, B.

doi:10.1016/j.jmmm.2009.12.014

Cited by 18 publications

(7 citation statements)

References 28 publications

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“…Contrary to the other phases discussed, the rutile phase of TiO 2 has an axially elongated Ti site with D 2 h symmetry caused by in-plane distortion of the equatorial oxide bond angles from 90°. This results in both significant axial and rhombic contribution to the zero-field splitting, D = −6858 × 10 –4 cm –1 and E = −1352 × 10 –4 cm –1 , respectively …”

Section: Resultsmentioning

confidence: 99%

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Spectroscopic Study of the Reversible Chemical Reduction and Reoxidation of Substitutional Cr Ions in Sr₂TiO₄

et al. 2017

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The solid-state synthesis and controllable speciation of Cr dopants in the layered perovskite SrTiO is reported. We employed a chemical reduction procedure with NaBH at relatively mild temperatures (<450 °C) to impart sensitive control over the relative concentration of Cr dopants, the charge-state of oxygen-vacancy defects, and presence of Ti defects in highly reduced Cr-doped SrTiO. The electron paramagnetic resonance (EPR) spectra of the reduced powder samples reveal a 12-fold increase in the Cr concentration within the axially compressed Ti-site of the SrTiO host. The increase in Cr content is achieved through the reduction of higher-valence Cr ions that are either EPR silent or diamagnetic. The spin-Hamiltonian parameters for Cr substituted at the B-site of SrTiO were refined to D = -201 × 10 cm, g = 1.980, and g = 1.978. In addition, the Cr ion exhibits a temperature-dependent axial component to the zero-field splitting of the A ground term that is accounted for by ligand field theory and an isotropic contraction of the SrTiO lattice with decreasing temperature. The observed changes to the electronic structure upon reduction are quantitatively reversible upon reoxidation of the sample under aerobic annealing at the same temperature and duration as the reduction conditions. This temperature dependence of the Cr content in the Cr-doped SrTiO powders is discussed and contrasted to our recent study on Cr-doped SrTiO.

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Section: Resultsmentioning

confidence: 99%

“…This results in both significant axial and rhombic contribution to the zero-field D = −6858 × 10 −4 cm −1 and E = −1352 × 10 −4 cm −1 , respectively. 44…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

Spectroscopic Study of the Reversible Chemical Reduction and Reoxidation of Substitutional Cr Ions in Sr₂TiO₄

et al. 2017

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“…(1) Confusion between the CF (LF) and SH (ZFS) quantities, mainly the CF=ZFS confusion exemplifi ed by consideration of the two notions: the CF parameters (CFPs) and the ZFS parameters evidently as synonymous, occurs in recent EMR--related papers, e.g., [22][23][24][25][26][27][28][29][30][31][32]; for critical comments, see [14]. Apart from the problems and confusions identifi ed in the review on molecular magnets [16], serious forms of the CF=ZFS confusion occur also in the EMR and SMM/MNM related textbook [13].…”

Section: Summary Of Emr-related Problemsmentioning

confidence: 99%

EMR-related problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians

Rudowicz

Karbowiak

2015

Nukleonika

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The interface between optical spectroscopy, electron magnetic resonance (EMR), and magnetism of transition ions forms the intricate web of interrelated notions. Major notions are the physical Hamiltonians, which include the crystal field (CF) (or equivalently ligand field (LF)) Hamiltonians, and the effective spin Hamiltonians (SH), which include the zero-field splitting (ZFS) Hamiltonians as well as to a certain extent also the notion of magnetic anisotropy (MA). Survey of recent literature has revealed that this interface, denoted CF (LF) ↔ SH (ZFS), has become dangerously entangled over the years. The same notion is referred to by three names that are not synonymous: CF (LF), SH (ZFS), and MA. In view of the strong need for systematization of nomenclature aimed at bringing order to the multitude of different Hamiltonians and the associated quantities, we have embarked on this systematization. In this article, we do an overview of our efforts aimed at providing a deeper understanding of the major intricacies occurring at the CF (LF) ↔ SH (ZFS) interface with the focus on the EMR-related problems for transition ions.

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“…This notation explicitly indicates the CF ¼ZFS confusion, whereas no reference was provided [152] for the Q q k operators. The incorrect terminology naming explicitly the true ZFS and/ or the ZFS parameters as the 'CF interaction (effects)' and/or the CF parameters, respectively, may be found also in the recent EPR studies of the Gd 3 þ ions by Garcia et al [153] and the Fe 3 þ ions by Güler et al [154].…”

Section: Confusion Between the Cf (Lf) And Sh (Zfs) Quantities In Thementioning

confidence: 99%

Terminological confusions and problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians—Survey of the CF=ZFS confusion in recent literature

Rudowicz¹,

Karbowiak²

2014

Physica B: Condensed Matter

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EPR study of Mn-implanted single crystal plates of TiO2 rutile

Cited by 18 publications

References 28 publications

Spectroscopic Study of the Reversible Chemical Reduction and Reoxidation of Substitutional Cr Ions in Sr₂TiO₄

Spectroscopic Study of the Reversible Chemical Reduction and Reoxidation of Substitutional Cr Ions in Sr₂TiO₄

EMR-related problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians

Terminological confusions and problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians—Survey of the CF=ZFS confusion in recent literature

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EPR study of Mn-implanted single crystal plates of TiO2 rutile

Cited by 18 publications

References 28 publications

Spectroscopic Study of the Reversible Chemical Reduction and Reoxidation of Substitutional Cr Ions in Sr2TiO4

Spectroscopic Study of the Reversible Chemical Reduction and Reoxidation of Substitutional Cr Ions in Sr2TiO4

EMR-related problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians

Terminological confusions and problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians—Survey of the CF=ZFS confusion in recent literature

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Product

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Spectroscopic Study of the Reversible Chemical Reduction and Reoxidation of Substitutional Cr Ions in Sr₂TiO₄

Spectroscopic Study of the Reversible Chemical Reduction and Reoxidation of Substitutional Cr Ions in Sr₂TiO₄