Bulk Fermi surface and momentum density in heavily doped La<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Sr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>CuO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mm

Al-Sawai, W.; Barbiellini, B.; Sakurai, Y.; Itou, M.; Mijnarends, P.E.; Markiewicz, R. S.; Kaprzyk, S.; Wakimoto, S.; Fujita, M.; Basak, S.; Lin, Hsin; Wang, Yung Jui; Eijt, S.W.H.; Schüt, H.; Yamada, K.; Bansil, Arun

doi:10.1103/physrevb.85.115109

Cited by 12 publications

(8 citation statements)

References 81 publications

(66 reference statements)

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“…The quantitative agreement between DFT calculations and momentum density experiments (2D ACAR and 2D Compton scattering reconstruction) shown in Ref. [12] suggests that Fermi liquid physics is restored in the overdoped regime. A FS signal was also clearly observed by Compton scattering in the third Brillouin zone along [100] and the calculated FS topology was found to be in good accord with the corresponding experimental data.…”

Section: X-ray Compton Scattering Spectroscopysupporting

confidence: 54%

“…The AGP and RVB calculations have shown that the deviation from integer occupancy becomes stronger as correlations grow. However, the important finding of our recent work in an overdoped (x = 0.3) single crystal of La 2−x Sr x CuO 4 [12] is that strong correlation effects that ordinarily reduce the Compton anisotropy amplitudes are no longer effective at this doping. The quantitative agreement between DFT calculations and momentum density experiments (2D ACAR and 2D Compton scattering reconstruction) shown in Ref.…”

Section: X-ray Compton Scattering Spectroscopymentioning

confidence: 88%

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High-temperature cuprate superconductors studied by x-ray Compton scattering and positron annihilation spectroscopies

Barbiellini

2013

J. Phys.: Conf. Ser.

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The bulk Fermi surface in an overdoped (x = 0.3) single crystal of La2−xSrxCuO4 has been observed by using x-ray Compton scattering. This momentum density technique also provides a powerful tool for directly seeing what the dopant Sr atoms are doing to the electronic structure of La2CuO4. Because of wave function effects, positron annihilation spectroscopy does not yield a strong signature of the Fermi surface in extended momentum space, but it can be used to explore the role of oxygen defects in the reservoir layers for promoting high temperature superconductivity.

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Section: X-ray Compton Scattering Spectroscopysupporting

confidence: 54%

Section: X-ray Compton Scattering Spectroscopymentioning

confidence: 88%

High-temperature cuprate superconductors studied by x-ray Compton scattering and positron annihilation spectroscopies

Barbiellini

2013

J. Phys.: Conf. Ser.

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“…This might explain an important finding of Ref. that the correlations that ordinarily reduce the Compton anisotropy amplitudes are no longer effective in La 1.7 Sr 0.3 CuO 4 .…”

Section: Discussionmentioning

confidence: 93%

“…It leads to weakening of the momentum dependence of the enhancement until its disappearance when there are high contributions of HMC. Therefore, in such materials, in which lattice effects are strong, IPM describes e–p densities quite well (as, e.g., in Y or observed lately in overdoped cuprate superconductors ).…”

Section: Many‐body Effectsmentioning

confidence: 83%

Electron–positron momentum densities in crystalline solids

Kontrym‐Sznajd

Sormann

2013

Physica Status Solidi (b)

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The uniqueness of information contained in electron densities r(p) in the extended momentum space is pointed out, showing that certain electronic properties can be derived only from r(p), directly related to the electron Bloch wave functions. The influence of many-body effects on the electron-positron (e-p) momentum density and of the crystal lattice periodicity on scattering effects is discussed. On the example of Mg it is illustrated that for simple metals there is a unique opportunity to estimate, for e-p densities, electron-electron correlation effects quantitatively.1 Introduction The knowledge of the Fermi surface (FS) topology is crucial to understand the electron properties of quantum systems [1][2][3][4]. The FS can be determined experimentally with various methods. The most common quantum oscillatory techniques [5][6][7] allow estimation of only some quantities related to FS without a visualization of its shape. Other techniques such as Compton scattering [8,9], angular correlation of annihilation radiation (ACAR) [10,11], and angle-resolved photoemission spectroscopy (ARPES) [12] yield information on the shape of FS in the whole reciprocal space [13]. The most direct method of probing electronic structure is ARPES, also known as ARUPS (angleresolved ultraviolet photoemission spectroscopy) [14,15]. As for each method, it has also some limitations [16], such as, e.g., those appearing in studies of small elliptical FS hole pockets in hydrated sodium cobalt oxides. These pockets were seen in Shubnikov-de Haas oscillations [17], phonon softening [18] and Compton scattering experiments [19] but not in ARPES measurements [20].ACAR experiments probe the momentum density of electron-positron (e-p) pairs in the extended momentum (p) space [11,13]

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“…First, the TPMD of an oriented Fe 2 TiSn single crystal with the integration axis along [100] was measured at the positron beam facility POSH at the Reactor Instituut of the Delft University of Technology [8,9]. The sample was aligned with the aid of single crystal Xray diffraction.…”

Section: Measurementsmentioning

confidence: 99%

Quality of Heusler single crystals examined by depth-dependent positron annihilation techniques

et al. 2015

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Abstract.Heusler compounds exhibit a wide range of different electronic ground states and are hence expected to be applicable as functional materials in novel electronic and spintronic devices. Since the growth of large and defect-free Heusler crystals is still challenging, single crystals of Fe 2 TiSn and Cu 2 MnAl were grown by the optical floating zone technique. Two positron annihilation techniques -Angular Correlation of Annihilation Radiation (ACAR) and Doppler Broadening Spectroscopy (DBS) -were applied in order to study both, the electronic structure and lattice defects. Recently, we succeeded to observe clearly the anisotropy of the Fermi surface of Cu 2 MnAl, whereas the spectra of Fe 2 TiSn were disturbed by foreign phases. In order to estimate the defect concentration in different samples of Heusler compounds the positron diffusion length was determined by DBS using a monoenergetic positron beam. IntroductionHeusler crystals comprise a large class of ternary intermetallic compounds with the L2 1 structure type and with the formula X 2 YZ where X, Y are transition metals, and Z is a non-magnetic or a nonmetallic element. The family of Heusler compounds exhibits an extraordinary wide range of different electronic ground states with metallic, semiconducting, insulating, half-metallic, ferromagnetic or superconducting behavior [1]. For novel electronic and spintronic applications great efforts are undertaken to benefit from the electronic properties of this class of materials. For this reason, it is a major task to develop new functional materials based on Heusler compounds. In order to enable the investigation of basic properties such as the electronic structure the availability of Heusler singlecrystals is of major importance. However, the growth of large and defect-free single-crystals of this class of ternary alloys remains still challenging.Within this contribution, we focus on the ternary systems Cu 2 MnAl and Fe 2 TiSn. Cu 2 MnAl is the Heusler system per se: In 1903, Fritz Heusler discovered that this compound behaves like a magnet, although none of its constituent elements is ferromagnetic by itself [2]. The Curie temperature of Cu 2 MnAl is found to be T C = 622 K. For Fe 2 TiSn various properties are theoretically predicted such as a non-magnetic ground state, a pseudogap and a very low density of states at the Fermi level [3,4].

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Bulk Fermi surface and momentum density in heavily doped La2−xSrxCuO4

Cited by 12 publications

References 81 publications

High-temperature cuprate superconductors studied by x-ray Compton scattering and positron annihilation spectroscopies

High-temperature cuprate superconductors studied by x-ray Compton scattering and positron annihilation spectroscopies

Electron–positron momentum densities in crystalline solids

Quality of Heusler single crystals examined by depth-dependent positron annihilation techniques

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