Magnetic properties of bismuth(III) oxy compounds

Кравченко, Е. А.; Orlov, V. G.; Shlykov, M. P.

doi:10.1070/rc2006v075n01abeh003596

Cited by 25 publications

(19 citation statements)

References 8 publications

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“…However, the com parison of O1s electron binding energies in α Bi 2 O 3 and in oxides of alkaline earth elements (Ca, Sr, and Ba) [16] shows that, in the latter, the electron density on the oxygen is far higher than in bismuth oxide. This pro vides support to the earlier assumption [1,6] of the existence of holes in the 2p electron subsystem of oxy gen atoms in α Bi 2 O 3 . The upper panels of Figs.…”

Section: Resultssupporting

confidence: 88%

“…Choosing to study α Bi 2 O 3 , BaBiO 3 , and NaBiO 3 by X ray photoelectron spectroscopy (XPES) and to calculate their electronic band structures, we were interested in their electron density distributions in view of the earlier discovered unusual magnetic prop erties of α Bi 2 O 3 and some other oxygen containing bismuth compounds [1]. In α Bi 2 O 3 , BaBiO 3 , and NaBiO 3 , the charge state of a bismuth atom should change from Bi 3+ to Bi 4+ and then to Bi 5+ if considered in terms of the formal atomic valences of Na + , Ba 2+ , and O 2-.…”

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confidence: 99%

“…The aforementioned unusual magnetic properties of α Bi 2 O 3 and some other oxygen containing bis muth compounds were discovered and studied by 209 Bi NQR spectroscopy and SQUID magnetometry [1,5,6]. Zero magnetic field Zeeman splitting in the 209 Bi NQR spectra of α Bi 2 O 3 and Bi 3 O 4 Br proved the existence of local magnetic fields H loc with intensities of up to 250 G. SQUID magnetometry data obtained upon zero field cooling of an α Bi 2 O 3 single crystal made it possible to estimate the effective magnetic moment of the crystal at μ eff ≈ 0.06 µB per formula unit.…”

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confidence: 99%

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Electronic structure of oxygen-containing bismuth compounds

Кравченко

Кузнецов

Orlov³

et al. 2015

Russ. J. Inorg. Chem.

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Systematic X ray photoelectron spectroscopic (XPES) measurements were performed for bis muth compounds: α Bi 2 O 3 , BaBiO 3 , and NaBiO 3 . Data on the valence band structure and positions of core electron levels in atoms were gained. Electronic band structure calculations were performed by the full potential linear muffin tin orbital (FP LMTO) method. A comprehensive analysis of the electronic struc tures was carried out on the basis of comparison of experimental and theoretical data. Our results imply the occurrence of noticeable electronic correlations in the compounds under study, which should be taken into account in interpreting the unusual properties discovered earlier in α Bi 2 O 3 and in some other oxygen con taining bismuth compounds.

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Section: Resultssupporting

confidence: 88%

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confidence: 99%

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confidence: 99%

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Electronic structure of oxygen-containing bismuth compounds

Кравченко

Кузнецов

Orlov³

et al. 2015

Russ. J. Inorg. Chem.

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“…As unpolarized matter sample we used a cylindrical BGO crystal (Bi 4 Ge 3 O 12 , ρ=7.13 g/cm 3 ). BGO has a high nucleon number density, is a non-conductive material that shows low Johnson-Nyquist noise and is said to have an unusual magnetism-related behaviour in weak constant magnetic fields (χ mag ≈ 0 ppm) [20][21][22]. For systematic checks, the BGO crystal could be placed left (L) and right ( ) with respect to the 3 He/ 129 Xe sample cell (see Fig.…”

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confidence: 99%

“…Our experimental approach to search for non-magnetic, spin-dependent interactions is to use an ultra-sensitive low-field comagnetometer based on detection of free spin precession of gaseous, nuclear polarized samples [11]. The Larmor frequencies of 3 He and 129 Xe in a guiding magnetic field B are given by ω L,He(Xe) = γ He(Xe) · B, with γ He(Xe) being the gyromagnetic ratios of the respective gas species [12,13] with γ He /γ Xe = 2.75408159 (20). The influence of the ambient magnetic field and its temporal fluctuations cancels in the difference of measured Larmor frequencies of the co-located spin samples…”

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confidence: 99%

Constraints on Spin-Dependent Short-Range Interaction between Nucleons

et al. 2013

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We search for a spin-dependent P -and T -violating nucleon-nucleon interaction mediated by light pseudoscalar bosons such as axions or axion-like particles. We employed an ultra-sensitive low-field magnetometer based on the detection of free precession of co-located 3 He and 129 Xe nuclear spins using SQUIDs as low-noise magnetic flux detectors. The precession frequency shift in the presence of an unpolarized mass was measured to determine the coupling of pseudoscalar particles to the spin of the bound neutron. For boson masses between 2 µeV and 500 µeV (force ranges between 3·10 −4 m -10 −1 m) we improved the laboratory upper bounds by up to 4 orders of magnitude. origin into a photon in the presence of a static magnetic field. However, any axion or axion-like particle that couples with both scalar and pseudoscalar vertices to fundamental fermions would also mediate a parity and time-reversal symmetryviolating force between a fermion f and the spin of another fermion f σ , which is parameterized by a Yukawatype potential with range λ and a monopole-dipole coupling given by [8]:σ is the spin vector and λ is the range of the Yukawa-force with λ= /(m a c). Thus, the entire axion window can be probed by searching for spin-dependent short-range forces in the range between 20 µm and 0.2 m. g f s and g fσ p are dimensionless scalar and pseudoscalar coupling constants which in our case correspond to the scalar coupling of an axion-like particle to a nucleon (g . Accordingly, we have m fσ = m n .r is the unit distance vector from the bound neutron to the nucleon. The potential given by Eq. 1 effectively acts near the surface of a massive unpolarized sample as a pseudomagnetic field and gives rise to a shift ∆ν sp = 2 · V Σ /h, e.g., in the precession frequency of nuclear spin-polarized gases ( 3 He and 129 Xe), which according to the Schmidt model [9] can be regarded as an effective probe of spinpolarized bound neutrons. The potential V Σ is obtained by integration of V sp (r) from Eq. 1 over the volume of the massive unpolarized sample averaged over the volume of the polarized spin-sample, each having a cylindrical shape. Based on the analytical derivation of V Σ,∞ for disc-shaped spin-and matter samples with respective thicknesses D and d [10], we obtainη(λ) takes account for the finite size in transverse direction of our cylindrical samples and ∆x represents the finite gap between them. Furthermore, κ = 2 g N s g n p /(8π · m n ) and N is the nucleon number density of the unpolarized matter sample. η(λ) 1 is determined numerically for our cylindrically shaped spin-and matter samples at "close"-position (see Fig. 1). Our experimental approach to search for non-magnetic, spin-dependent interactions is to use an ultra-sensitive low-field comagnetometer based on detection of free spin precession of gaseous, nuclear polarized samples [11]. The Larmor frequencies of 3 He and 129 Xe in a guiding magnetic field B are given by ω L,He(Xe) = γ He(Xe) · B, with γ He(Xe) being the gyromagnetic ratios of the respective gas species...

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