X-ray-absorption fine-structure standards: A comparison of experiment and theory

Li, G. G.; Bridges, F.; Booth, C. H.

doi:10.1103/physrevb.52.6332

Cited by 214 publications

(180 citation statements)

References 30 publications

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“…Systematic errors for these data are expected to be about 0.005 Å in the bond length and 5% in σ and the number of neighbors. 70 Cyclopentadienes.…”

Section: Methodsmentioning

confidence: 99%

Supramolecular Catalysis of Orthoformate Hydrolysis in Basic Solution: An Enzyme-Like Mechanism

2008

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Abstract. Magnetic susceptibility measurements and X-ray data confirm that tert-butyl substituted manganocenes [(Me 3 C) n C 5 H 5-n ] 2 Mn (n= 1, 2) follow the trend previously observed with the methylated manganocenes, i.e., electron donating groups attached to the Cp ring stabilize the low-spin (LS) electronic ground state relative to Cp 2 Mn and exhibit higher spin-crossover (SCO) temperatures.However, introducing three CMe 3 groups on each ring gives a temperature invariant high-spin (HS) state manganocene. The origin of the high-spin state in [1,2,4-(Me 3 C) 3 C 5 H 2 ] 2 Mn is due to the significant bulk of the [1,2,4-(Me 3 C) 3 C 5 H 2 ] -ligand, which is sufficient to generate severe inter-ring steric strain that prevents the realization of the low-spin state. Interestingly, the spin transition in [1,3-(Me 3 C) 2 C 5 H 3 ] 2 Mn is accompanied by a phase transition resulting in a significant irreversible hysteresis (∆T c = 16 K). This structural transition was also observed by extended X-ray absorption fine-structure (EXAFS) measurements. Magnetic susceptibility studies and X-ray diffraction data on SiMe 3 substituted 2 manganocenes [(Me 3 Si) n C 5 H 5-n ] 2 Mn (n= 1, 2, 3) show high-spin configuration in these cases. Although tetra-and hexasubstituted manganocenes are high-spin at all accessible temperatures, the disubstituted manganocenes exhibit a small low-spin admixture at low temperature. In this respect it behaves similarily to [(Me 3 C)(Me 3 Si)C 5 H 3 ] 2 Mn, which has a constant low-spin admixture up to 90 K and then gradually converts to high-spin. Thermal spin-trapping can be observed for [(Me 3 C)(Me 3 Si)C 5 H 3 ] 2 Mn on rapid cooling.

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“…Systematic errors for these data are expected to be about 0.005 Å in the bond length and 5% in σ and the number of neighbors. 70 Cyclopentadienes.…”

Section: Methodsmentioning

confidence: 99%

Supramolecular Catalysis of Orthoformate Hydrolysis in Basic Solution: An Enzyme-Like Mechanism

2008

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“…One double layer of each sample (sample thickness is ∼0.2 absorption lengths for Eu) was used when collecting XANES data. A pre-edge background (contribution from other edges) was subtracted for all the XANES data using standard procedures [14,15]. The step height of the main absorption edge was normalized to 1 for each of the samples and references.…”

Section: Methodsmentioning

confidence: 99%

Investigation of ferromagnetic filled skutterudite compounds EuT₄Sb₁₂(T = Fe, Ru, Os)

Bauer

Ślebarski

Frederick

et al. 2004

J. Phys.: Condens. Matter

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The physical properties of single crystals of filled skutterudite compounds EuT 4 Sb 12 (T = Fe, Ru, Os) have been investigated by means of x-ray diffraction, electrical resistivity, specific heat, magnetization, and x-ray absorption spectroscopy measurements. The Eu-based materials crystallize in the LaFe 4 P 12 -type structure (space group I m3 appears to exhibit either canted ferromagnetic or ferrimagnetic order at T C = 88 K whereas EuRu 4 Sb 12 and EuOs 4 Sb 12 are ferromagnets with Curie temperatures of T C = 4 and 9 K, respectively. X-ray absorption near edge spectroscopy measurements reveal a nearly divalent Eu electronic configuration for EuT 4 Sb 12 (T = Fe, Ru, Os) with no significant change with T atom or temperature.

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“…It has been shown to be accurate to within ∼5% for metals. 27 Any static disorder should manifest as a constant offset, as is clearly shown, for example, for La 1−x Ca x MnO 3 . 28 The XAFS data were fit in r-space, following procedures in Ref.…”

Section: B Xafsmentioning

confidence: 99%

“…28 The XAFS data were fit in r-space, following procedures in Ref. [ 24,27]. Initial fits included a short X-Cu pair at ∼2.55Å.…”

Section: B Xafsmentioning

confidence: 99%

Slow crossover inYbXCu4(X=Ag, Cd, In, Mg, Tl, Zn) intermediate-valence compounds

Lawrence

Riseborough²,

Booth³

et al. 2001

Phys. Rev. B

Self Cite

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We compare the results of measurements of the magnetic susceptibility χ(T ), the linear coefficient of specific heat γ(T ) = C(T )/T and 4f occupation number n f (T ) for the intermediate valence compounds YbXCu 4 (X = Ag, Cd, In, Mg, Tl, Zn) to the predictions of the Anderson impurity model, calculated in the non-crossing approximation (NCA). The crossover from the low temperature Fermi liquid state to the high temperature local moment state is substantially slower in the compounds than predicted by the NCA; this corresponds to the "protracted screening" recently predicted for the Anderson Lattice. We present results for the dynamic susceptibility, measured through neutron scattering experiments, to show that the deviations between theory and experiment are not due to crystal field effects, and we present x-ray-absorption fine-structure (XAFS) results that show the local crystal structure around the X atoms is well ordered, so that the deviations probably do not arise from Kondo Disorder. The deviations may correlate with the background conduction electron density, as predicted for protracted screening.

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X-ray-absorption fine-structure standards: A comparison of experiment and theory

Cited by 214 publications

References 30 publications

Supramolecular Catalysis of Orthoformate Hydrolysis in Basic Solution: An Enzyme-Like Mechanism

Supramolecular Catalysis of Orthoformate Hydrolysis in Basic Solution: An Enzyme-Like Mechanism

Investigation of ferromagnetic filled skutterudite compounds EuT₄Sb₁₂(T = Fe, Ru, Os)

Slow crossover inYbXCu4(X=Ag, Cd, In, Mg, Tl, Zn) intermediate-valence compounds

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X-ray-absorption fine-structure standards: A comparison of experiment and theory

Cited by 214 publications

References 30 publications

Supramolecular Catalysis of Orthoformate Hydrolysis in Basic Solution: An Enzyme-Like Mechanism

Supramolecular Catalysis of Orthoformate Hydrolysis in Basic Solution: An Enzyme-Like Mechanism

Investigation of ferromagnetic filled skutterudite compounds EuT4Sb12(T = Fe, Ru, Os)

Slow crossover inYbXCu4(X=Ag, Cd, In, Mg, Tl, Zn) intermediate-valence compounds

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Product

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About

Investigation of ferromagnetic filled skutterudite compounds EuT₄Sb₁₂(T = Fe, Ru, Os)