Summary
The main structures of interband spectra of Ti1−x Hf x Se2 crystals (0≤x≤0.3 andx=1) have been investigated by means of thermoreflectance from 1 to 9 eV. New indications about the correspondence of the interband spectra of TiSe2 and HfSe2 are given. Detailed data at intermediate stoichiometries, which give also evidence of possible bowing effects, are reported and discussed. No relevant effect of the 200 K phase transition in TiSe2 is observable above 2 eV.
Riassunto
Sono state studiate, mediante la tecnica della termoriflettanza, le principali strutture dello spettro interbanda dei cristalli Ti1−x Hf x Se2 (0≤x≤0.3 ex=1), fra 1 e 9 eV. Si sono così ottenute nuove indicazioni circa la corrispondenza fra gli spettri interbanda del TiSe2 e dell'HfSe2. Si riportano in dettaglio e discutono i dati di termoriflettanza a valori intermedi dix con evidenza di possibili effetti di «bowing». Non sono stati osservati apprezzabili effetti della transizione di fase a 200 K ad energie superiori a 2 eV.
Резюме
Исследуются главные особенности междузонных спектров кристаллов Ti1−xHf x Se2 (0≤x≤0.3 иx=1) с помощью техники термоотражения в области от 1 до 9 эВ. Приводятся новые данные о соответствии между междузонными спектрами TiSe2 и HfSe2. Подробно обсуждаются данные при промежуточных значенияхx. Не наблюдаются заметные эффекты фазового перехода при 200 К в TiSe2 при энергиях выше 2 эВ.
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References
F. Levy:J. Phys. C,13, 2901 (1980);M. Scharli, J. Brunner, H. P. Vaterlaus andF. Levy:J. Phys. C,16, 1527 (1983).
I. Taguchi:J. Phys. C,14, 3221 (1982);Solid State Commun.,32, 679 (1979).
A. Borghesi, G. Guizzetti, A. Stella, E. Reguzzoni andF. Levy:Solid State Commun.,41, 199 (1982);43, 209 (1982).
I. Taguchi, H. P. Vaterlaus andF. Levy:Solid State Commun.,49, 79 (1984).
A. Zunger andA. J. Freeman:Phys. Rev. B,17, 1839 (1978).
F. J. Di Salvo, D. E. Moncton andJ. V. Waszczak:Phys. Rev. B,14, 4321 (1976);F. J. Di Salvo andJ. V. Waszczak:Phys. Rev. B,17, 3801 (1978).
D. L. Greenaway andR. Nitsche:J. Phys. Chem. Solids,26, 1445 (1965).
A. Borghesi, M. Geddo, G. Guizzetti, E. Reguzzoni, A. Stella andF. Levy:Phys. Rev. B,29, 3167 (1984).
R. Woo andF. C. Brown:Solid State Commun.,28, 341 (1978).
W. Y. Liang, G. Lucovsky, J. C. Mikkelsen andR. H. Friend:Philos. Mag. B,39, 133 (1979).
J. A. Wilson, A. S. Barker, Jr.,F. J. Di Salvo andI. A. Ditzenberger:Phys. Rev. B,18, 2866 (1978).
G. Campagnoli, A. Gustinetti, A. Stella andE. Tosatti:Phys. Rev. Lett.,38, 95 (1977);Phys. Rev. B,20, 2217 (1979).
L. Nosenzo, G. Samoggia andI. Pollini:Phys. Rev. B,29, 3607 (1984).
G. Campagnoli, A. Gustinetti, D. Maghini, A. Stella andF. Levy:Proceedings of the XIV International Conference on the Physics of Semiconductors, Edinburgh, 1978, edited byB. L. Wilson (IOP, Bristol, 1978), Chapt. 25.
J. A. Wilson andA. D. Yoffe:Adv. Phys.,18, 193 (1969).
N. G. Stoffel, F. Levy, C. M. Bertoni andG. Mergaritondo:Solid State Commun.,41, 53 (1982).
A. Mancini, A. Rizzo, R. Girlanda, G. Guizzetti, L. Nosenzo, E. Doni andE. Reguzzoni:Nuovo Cimento D,6, 751 (1982).
H. P. Hughes andW. Liang:J. Phys. C,10, 1079 (1977).
See, for instance,M. Cardona:Solid State Physics, edited byF. Seitz andD. Turnbull (Academic Press, New York, N.Y., 1970), Suppl. II;B. Batz:Semiconductors and Semimetals, Vol.9, edited byR. K. Willardson andA. C. Beer (Academic Press, New York, N.Y., 1972), p. 316.
A. Zunger andA. J. Freeman:Phys. Rev. B,16, 906 (1977).
G. Campagnoli, A. Gustinetti andA. Stella:Solid State Commun.,18, 973 (1976).
L. F. Mattheiss:Phys. Rev. B,8, 3719 (1973).
G. Rossi: private communication.
C. Alibert, A. Joulliè, A. M. Joullie andC. Ance:Phys. Rev. B,27, 4946 (1983).
K. C. Hass, H. Ehrenreich andB. Velicky:Phys. Rev. B,27, 1088 (1983).
H. Ehrenreich andK. C. Hass:J. Vac. Sci. Technol.,21, 133 (1982).
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Borghesi, A., Guizzetti, B., Nosenzo, L. et al. Optical properties of Ti1−x Hf x Se2 layered compounds from 1 to 9 eV. Il Nuovo Cimento D 4, 141–152 (1984). https://doi.org/10.1007/BF02451574
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DOI: https://doi.org/10.1007/BF02451574