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THE BAND STRUCTURE OF CUPROUS OXIDE

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HAL Id: jpa-00213253

https://hal.archives-ouvertes.fr/jpa-00213253

Submitted on 1 Jan 1967

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THE BAND STRUCTURE OF CUPROUS OXIDE

J. Dahl

To cite this version:

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JOURNAL DE PHYSIQUE Colloque C 3, supplkment au no 5-6, Tome 28, mai-juin 1967, page C 3-31

THE BAND STRUCTURE OF CUPROUS OXIDE

The results from an APW (augmented plane wawe) calculation on C u 2 0 are discussed (J. Phys. Chem. Solids, 1966, 27, 931). The calculation shows that the oxygen orbitals do not contribute much to the highest valence bands and the lowest conduction bands of this crystal, so that these bands, in a first approximation, can be considered as perturbed copper bands. Since the space group,

02

of face-centered copper includes the space group 0: of C u 2 0 as a subgroup, the band structures of the two compounds can be compared directly. On the basis of this comparison and the detailed results from the energy band calculation, the nature of the Cu20 excitons is discussed.

DISCUSSION

C. SENNETT.

-

Have you made any theoretical study of the effect of a magnetic field on the exciton

lines of the yellow series, using the assumption that the highest valence band is of symmetry T'sf ?

J. P. DAHL. - NO, I have not.

S. NIKITINE. - Je voudrais souligner l'importance du travail du Dr Dahl. Le rtseau de Cu,O est complexe. Malgrk cela, le Dr Dahl a pu calculer la structure des bandes de ce compod. Dans la communication sui- vante, nous montrerons que cette structure calcul6e permet de mieux comprendre le spectre de Cu20. Mais naturellement, la complexit6 des calculs et de la structure de bande ne permet une comparaison quan- titative avec l'expkrience que pour quelques transitions. Le point soulev6 par le Dr Dahl dans sa conf6rence est fort important. I1 y a lieu d'esp6rer que ces d6veloppe- ments permettront de comprendre les effets Zeeman et Stark de Cu20 qui 6taient difficiles h interpreter jusqu'h maintenant.

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