Topology of the Fermi Surface of Copper

Burdick, Glenn A.

doi:10.1103/physrevlett.7.156

Cited by 37 publications

(3 citation statements)

References 2 publications

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“…In figure 2 the isosurface dividing the Brillouin zone in equal parts is plotted, which has the well known shape of the Fermi surface of copper (see e.g. [10,11]). Although the qualitative agreement with previous measurements is good, three projections are not sufficient to extract reliable quantitative data.…”

Section: Resultsmentioning

confidence: 99%

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First 2D-ACAR Measurements on Cu with the new Spectrometer at TUM

Weber

Böni

Ceeh

et al. 2013

J. Phys.: Conf. Ser.

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Abstract. The two-dimensional measurement of the angular correlation of the positron annihilation radiation (2D-ACAR) is a powerful tool to investigate the electronic structure of materials. Here we report on the first results obtained with the new 2D-ACAR spectrometer at the Technische Universität München (TUM). To get experience in processing and interpreting 2D-ACAR data, first measurements were made on copper. The obtained data are treated with standard procedures and compared to theoretical calculations. It is shown that the measurements are in good agreement with the calculations and that the Fermi surface can be entirely reconstructed using three projections only.

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Section: Resultsmentioning

confidence: 99%

“…[10,11]). Although the qualitative agreement with previous measurements is good, three projections are not sufficient to extract reliable quantitative data.…”

Section: Resultsmentioning

confidence: 99%

First 2D-ACAR Measurements on Cu with the new Spectrometer at TUM

Weber

Böni

Ceeh

et al. 2013

J. Phys.: Conf. Ser.

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“…Comparison of the belly radii R ( i n units of the free electron sphere radii) of NiH with PdH and noble metals. ( ( I ) From Gupta and Freeman (1978): ( h ) from Morse (19601: (c) from Burdick (1961 where N, (E,) is the DOS at EF per spin and per atom, ( I 2 ) is the square of the electron-phonon matrix element averaged over the FS, M is the mass of the atom and (a2) is the second moment of the renormalised phonon frequencies as defined by McMillan (1968). For compounds like NiH with large mass ratio between the constituent atoms, an approximate expression of i .…”

Section: Decrease In Superconducting T In Nih As Compared To Pdhmentioning

confidence: 99%

Non-Archimedean Measures Connected With Dirichlet Series

Višik¹

1976

Math. USSR Sb.

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With the aim of studying the characteristics of the electronic states at the Fermi energy. we habe inbestigated the electronic structure of NiH by means of an ab initio augmented plane wake calculation. The d band holes of the pure Ni metal are filled in the hydride. in agreement with magnetisation measurements and as suggested by a comparative study of the K absorption edges oi Ni and NiH. This feature is qualitatively similar to that found for PdH: however. the Fermi level in NiH is much closer to the top of the d bands than in PdH. This has se\eral important consequences. (i) NiH has a higher density of states with 10.78 electrons per Ryd per unit cell at the Fermi energy compared to 6.81 for PdH. This trend is i n agreement with the observed increase in the electronic specific heat from PdH, to NiH,. (ii) A larger metal d character and a smaller hydrogen s character is found in NiH compared to PdH, at the Fermi energy. The bandstructure results are used in conjunction with recent experimental estimates of the Debye and Einstein temperatures for the acoustic and optic modes respectively, to calculate the electron-phonon coupling parameter i using the model of Gaspari and Gyorffy. A large decrease of the electronic contribution to i is found from PdH to NiH. This contributes, together with the hardening of the optic modes evidenced by electrical resistivity measurements, to a drastic lowering of the superconducting transition temperature T, and should lead to the nonoccurrence of superconductivity in NiH above 1.5 K. A metal-hydrogen bonding band is found below the metal d states and lies much lower in energy than in the case of PdH; the bandstructure results are in general agreement with the calculation of Switendick. A site and angular momentum density-of-states analysis of the occupied energy bands is also presented which hopefully will stimulate photoemission and x-ray emission experiments.

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Methoden zur Berechnung des Energiespektrums in Idealkristallen

Stretiwolf

1962

Physica Status Solidi (b)

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Topology of the Fermi Surface of Copper

Cited by 37 publications

References 2 publications

First 2D-ACAR Measurements on Cu with the new Spectrometer at TUM

First 2D-ACAR Measurements on Cu with the new Spectrometer at TUM

Non-Archimedean Measures Connected With Dirichlet Series

Methoden zur Berechnung des Energiespektrums in Idealkristallen

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