EPR of Sm<sup>3+</sup>in BaFCl single crystals

Falin, M. L.; Bill, Hans; Lovy, Dominique

doi:10.1088/0953-8984/16/8/013

Cited by 11 publications

(12 citation statements)

References 7 publications

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“…In most cases, the average gvalue is close to 0.6. 32 As seen in the Fig. 2, the non-interacting limit describes the data at 8 K rather well.…”

Section: Resultsmentioning

confidence: 58%

“…In agreement with the field-dependence observed for the magnetic specific heat, we have adopted a powder g Sm value of 0.6, which is in the range observed for Sm(III) in sites of low-symmetry. 32 The ground multiplet of Sm(III), 6 H 5/2 , is split by a cubic crystal field into a doublet C 7 and a quartet C 8 . 33 In crystal fields of lower symmetry, the quartet C 8 splits into two Kramer doublets C 6 and C 7 .…”

Section: Resultsmentioning

confidence: 99%

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Short-range correlations in d–f cyanido-bridged assemblies with XY and XY-Heisenberg anisotropy

2011

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Two new d-f cyanido-bridged 1D assemblies [RE(pzam)(3)(H(2)O)Mo(CN)(8)]·H(2)O (RE = Sm(III), Er(III)) were synthesized and their magneto-structural properties have been studied by field-dependent magnetization and specific heat measurements at low temperatures (≥0.3 K). Below ≈ 10 K the ground state of both the Sm(III) and Er(III) ions is found to be a Kramers doublet with effective spin S = 1/2. From analyses of the low-temperature magnetic specific heat and magnetization the exchange coupling between these RE(III) effective spins and the Mo(v) spins S = 1/2 along the structural chains has been determined. It is found to be antiferromagnetic, with J(∥)/k(B) = -2.6 K and Ising-Heisenberg symmetry of the interaction (J(∥)/J(⊥) = 0.3) for RE = Sm(III), whereas the compound with RE = Er(III) behaves as a pure XY chain, with J(⊥)/k(B) = -1.0 K. For the compound [Sm(pzam)(3)(H(2)O)Mo(CN)(8)]·H(2)O a small λ-type anomaly in the specific heat is observed at about 0.6 K, which is ascribed to a transition to long-range magnetic ordering induced by weak interchain interactions of dipolar origin. No evidence for 3D interchain magnetic ordering is found in the Er(III) analogue.

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“…In most cases, the average gvalue is close to 0.6. 32 As seen in the Fig. 2, the non-interacting limit describes the data at 8 K rather well.…”

Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Short-range correlations in d–f cyanido-bridged assemblies with XY and XY-Heisenberg anisotropy

2011

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“…9 and 10. Clear angular dependence for the monoclinic Sm 3+ in ab and ac * planes are observed [12]. Different lines (8+8) belonging to 145 and 147 isotopes of samarium are visible.…”

Section: Epr Properties Of Ksw Single Crystalmentioning

confidence: 81%

Growth and EPR properties of KSm(WO4)2 and KEr(WO4)2 single crystals

et al. 2012

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Abstract:Growth conditions and electron paramagnetic resonance investigations of two well oriented KSm(WO 4 ) 2 and KEr(WO 4 ) 2 single crystals have been presented and discussed. Hyperfine structure of Sm 3+ ion was detected and analyzed for angular and temperature dependences. EPR spectra of KEr(WO 4 ) 2 and its angular dependence showed the presence of 5 magnetically nonequivalent Er centers in the crystal. A change in the type of magnetic interactions was analyzed using mixed (Gaussian and Lorentzian) fits of the EPR spectra.

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“…2) and may be attributed to an oxygen impurity related defect. Oxygen is a common impurity in barium fluorohalides (Falin et al, 2004) and typically forms two types of oxygen-vacancy centers. In BaFCl, the type I defect complex consists of oxygen substituted for a fluorine ion with a neighboring chlorine vacancy.…”

Section: Resultsmentioning

confidence: 99%

“…3). EPR studies of BaFCl single crystals conventionally doped with Sm have also found that Sm 3+ is the dominant ion species, and most probably substitutes for Ba 2+ with charge compensation provided by an O 2− ion, which substitutes for a nearby Cl − ion in the BaFCl host lattice (Falin et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

Cathodoluminescence Microanalysis of Irradiated Microcrystalline and Nanocrystalline Samarium Doped BaFCl

2012

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BaFCl:Sm3+ is an efficient photoluminescent storage phosphor for ionizing radiation. Cathodoluminescence (CL) microanalysis enables the Sm2+ and Sm3+ oxidation states of samarium doped BaFCl to be easily identified, provides information about electron-beam and X-ray induced modification of BaFCl:Sm, and enables the synthesis dependent spatial distribution of samarium dopants of <100 ppm concentration to be determined with sub-100 nm resolution at 295 K. CL spectroscopy of BaFCl:Sm particles reveals broad CL emissions at ≈ 360 and ≈500 nm associated with V k (Cl-) and oxygen-vacancy defects in the BaFCl host lattice and fine structure CL emissions associated with major 4GJ → 6HJ (Sm3+) and 5DJ → 7FJ (Sm2+) transitions. CL microanalysis shows samarium dopants are uniformly distributed in conventional sintered microcrystalline BaFCl:Sm. In contrast, CL investigations reveal that for BaFCl:Sm nanoparticles, which have been prepared using a co-precipitation method, with greatly improved Sm3+ → Sm2+ conversion efficiency, the samarium dopants are concentrated near the particle surface resulting in a BaFCl:Sm3+ shell surrounding the BaFCl core, which is stable to energetic irradiation.

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EPR of Sm³⁺in BaFCl single crystals

Abstract: BaFCl single crystals doped with Sm 3+ ions were studied by using the EPR method. Several types of paramagnetic Sm 3+ centres were found. The parameters of the corresponding spin Hamiltonians were determined. Structural models and ground states of the observed centres are proposed.

Cited by 11 publications

References 7 publications

Short-range correlations in d–f cyanido-bridged assemblies with XY and XY-Heisenberg anisotropy

Short-range correlations in d–f cyanido-bridged assemblies with XY and XY-Heisenberg anisotropy

Growth and EPR properties of KSm(WO4)2 and KEr(WO4)2 single crystals

Cathodoluminescence Microanalysis of Irradiated Microcrystalline and Nanocrystalline Samarium Doped BaFCl

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EPR of Sm3+in BaFCl single crystals

Abstract: BaFCl single crystals doped with Sm 3+ ions were studied by using the EPR method. Several types of paramagnetic Sm 3+ centres were found. The parameters of the corresponding spin Hamiltonians were determined. Structural models and ground states of the observed centres are proposed.

Cited by 11 publications

References 7 publications

Short-range correlations in d–f cyanido-bridged assemblies with XY and XY-Heisenberg anisotropy

Short-range correlations in d–f cyanido-bridged assemblies with XY and XY-Heisenberg anisotropy

Growth and EPR properties of KSm(WO4)2 and KEr(WO4)2 single crystals

Cathodoluminescence Microanalysis of Irradiated Microcrystalline and Nanocrystalline Samarium Doped BaFCl

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EPR of Sm³⁺in BaFCl single crystals