Temperature dependence of hyperfine interactions and of anisotropy of recoil-free fraction: A Mössbauer study of the 93.3-keV resonance of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Zn</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>67</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>in single crystals of zinc metal

Potzel, W.; Adlassnig, Wolfram; Närger, Ulrike; Obenhuber, Th.; Riski, K.; Kalvius, G. M.

doi:10.1103/physrevb.30.4980

Cited by 44 publications

(5 citation statements)

References 41 publications

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“…The results of least-squares refinement displayed in Fig. 2 were based on the assumption that the ADPs show a temperature dependence according to the Debye model 22 , 23 and taking into account a decomposition of the Debye temperature Θ for oxygen into a parallel and a perpendicular part following Potzel et al 24 . For this reason, it was necessary to record spectra of additional reflections to ensure an unambiguous refinement of the ADPs.…”

Section: Resultsmentioning

confidence: 99%

Picometer polar atomic displacements in strontium titanate determined by resonant X-ray diffraction

et al. 2018

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Physical properties of crystalline materials often manifest themselves as atomic displacements either away from symmetry positions or driven by external fields. Especially the origin of multiferroic or magnetoelectric effects may be hard to ascertain as the related displacements can reach the detection limit. Here we present a resonant X-ray crystal structure analysis technique that shows enhanced sensitivity to minute atomic displacements. It is applied to a recently found crystalline modification of strontium titanate that forms in single crystals under electric field due to oxygen vacancy migration. The phase has demonstrated unexpected properties, including piezoelectricity and pyroelectricity, which can only exist in non-centrosymmetric crystals. Apart from that, the atomic structure has remained elusive and could not be obtained by standard methods. Using resonant X-ray diffraction, we determine atomic displacements with sub-picometer precision and show that the modified structure of strontium titanate corresponds to that of well-known ferroelectrics such as lead titanate.

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Section: Resultsmentioning

confidence: 99%

Picometer polar atomic displacements in strontium titanate determined by resonant X-ray diffraction

et al. 2018

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“…The behaviour of the electronic structure of hexagonal close-packed (hcp) metals has been of central interest in various experimental [1][2][3] and theoretical [4][5][6][7] investigations. Of particular importance are systems like Zn and Cd with unusually large c/a ratios which are far above the ideal value c/a = (8/3) 1/2 ≈ 1.633.…”

Section: Introductionmentioning

confidence: 99%

Electronic topological transition in zinc metal at high external pressure

Steiner

Potzel

Karzel

et al. 1996

J. Phys.: Condens. Matter

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We report investigations of Zn metal under quasi-hydrostatic pressures up to 16 GPa by 67 Zn Mössbauer spectroscopy and scalar-relativistic linearized augmented plane wave (LAPW) calculations. Our studies show that at 4.2 K an electronic topological transition (ETT) occurs at about 6.6 GPa, corresponding to a volume change of (1−V /V • ) ≈ 0.085. At the ETT conduction electron states in the third Brillouin zone at the symmetry point L ('butterflies') move below the Fermi surface and start being occupied. At the ETT the electric field gradient tensor and the s electron density ρ(0) at the 67 Zn nucleus remain virtually unchanged, but the lattice dynamics is drastically affected. The Lamb-Mössbauer factor (LMF) abruptly drops by a factor of two between 6.5 and 6.7 GPa and the curvature of the pressure dependence of the second-order Doppler shift (S SOD ) changes markedly. The results on LMF and S SOD are described by a sudden destruction of a giant Kohn anomaly which accompanies the ETT.

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“…The measured and calculated values for a metallic polycrystalline Zn sample are also given. The average values of x 2 a and x 2 c were taken from Mössbauer measurements [5,6]. The calculated values of x 2 and p 2 were deduced from the phonon spectra [12][13][14].…”

Section: Resultsmentioning

confidence: 99%

“…It may be noted that a strong atomic binding along the hexagonal planes implies a large zeropoint mean-square linear momentum p 2 a and hence a small zero-point mean-square atomic displacement x 2 a , while a weak atomic binding along the c-axis implies a correspondingly small p 2 c and hence a large x 2 c . In fact, the zero-point mean-square displacements were measured using the Mössbauer effect [5,6] and were found to be in the ratio x 2 c / x 2 a = 1.57. At any intermediate direction making an angle θ with the c-axis, the effective temperature is related to T c and T a by:…”

Section: The Neutron Compton Scattering Techniquementioning

confidence: 99%

Study of the momentum distribution of a Zn single crystal using neutron Compton scattering

Nemirovsky

Moreh

Andersen

et al. 2000

J. Phys.: Condens. Matter

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The neutron Compton scattering technique (NCS) was used for measuring the atomic momentum distribution, at ~4.6 K, of an hcp zinc single crystal in directions parallel and perpendicular to the hexagonal planes. A strong anisotropy has been observed and interpreted in terms of the anisotropic binding of the atoms in Zn. The data were used for deducing the zero-point mean-square atomic momenta ⟨p2x⟩ and ⟨p2z⟩. These were combined with reported measured values of ⟨x2⟩ and ⟨z2⟩ obtained by the Mössbauer effect and used to test the predictions of the uncertainty principle for the two products ⟨p2x⟩⟨x2⟩ and ⟨p2z⟩⟨z2⟩ near 0 K. The measured values of ⟨p2x⟩ and ⟨p2z⟩ seem to conform to the requirements of the uncertainty relations to within 3%. The data are compared with those obtained using the nuclear resonance photon scattering (NRPS) technique.

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Temperature dependence of hyperfine interactions and of anisotropy of recoil-free fraction: A Mössbauer study of the 93.3-keV resonance ofZn67in single crystals of zinc metal

Cited by 44 publications

References 41 publications

Picometer polar atomic displacements in strontium titanate determined by resonant X-ray diffraction

Picometer polar atomic displacements in strontium titanate determined by resonant X-ray diffraction

Electronic topological transition in zinc metal at high external pressure

Study of the momentum distribution of a Zn single crystal using neutron Compton scattering

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