Abstract
Specific heat measurements have been performed under pressures up to 2.5 GPa on single phased-hcp lanthanum and a mixed phase sample yielding also results on fcc La. An evaluation of the pressure dependences of the Debye temperatureΘ D and the electronic specific heat coefficient γ has been possible and shows distinct differences between the two phases. While for thed-hcp phase marked variations with pressure have been found, there is hardly no change seen in fcc La. Ind-hcp La the most remarkable results are an initial increase of γ, which cannot be explained by the increase of the electron-phonon coupling parameter λ alone and, therefore, indicates an increase of the band structure density of states, as well as a strong softening ofΘ D at higher pressures. These results are discussed in the context of the existing knowledge on lanthanum.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Balster, H., Wittig, J.: J. Low Temperature Phys.81, 377 (1975)
Johnson, D.L., Finnemore, D.K.: Phys. Rev.158, 376 (1967)
Wühl, H., Eichler, A., Wittig, J.: Phys. Rev. Lett.31, 1393 (1973)
Eichler, A., Gey, W.: Rev. Sci. Instrum.50, 1445 (1979)
Eichler, A., Cieslik, J., Gey, W.: Physica B108, 1005 (1981)
Eichler, A., Bohn, H., Gey, W.: Z. Phys. B-Condensed Matter38, 21 (1980)
Bleckwedel, A., Eichler, A.: In: Physics of solids under high pressure. Schilling, J.S., Shelton, R.N. (eds.), p. 323. Amsterdam: North Holland 1981
Bleckwedel, A., Eichler, A.: Solid State Commun.56, 693 (1985)
Sullivan, P.F., Seidel, G.: Phys. Rev.173, 679 (1968)
Pan, P.H., Finnemore, D.K., Bevolo, A.J., Shanks, H.R., Beaudry, B.J., Schmidt, F.A., Danielson, G.C.: Phys. Rev. B21, 2809 (1980)
Maple, M.B., Wittig, J., Kim, K.S.: Phys. Rev. Lett.23, 1375 (1969)
Syassen, K., Holzapfel, W.B.: Solid State Commun.16, 533 (1975)
Takata, M., Oshida, S.: J. Phys. Soc. Jpn.30, 1640 (1971)
Jarlborg, T., Andersson, G., Sundqvist, B., Rapp, Ö.: J. Phys. Condensed Matter1, 8407 (1989)
Pickett, W.E., Freeman, A.J., Koelling, D.D.: Phys. Rev. B22, 2695 (1980)
Vijayakumar, V.: J. Phys. C8, 17 (1985)
Allen, P.B., Dynes, R.C.: J. Phys. C8, L158 (1975)
Vahldiek, F., Eichler, A.: Jpn. J. Appl. Phys. [Suppl. 26–3],26, 1255 (1987)
Baquero, R., López-Olazagasti, E.: Solid State Commun.53, 665 (1985)
Stassis, C., Smith, G.S., Harmon, B.N., Ho, K.-M., Chen, Y.: Solid State Commun.53, 773 (1985)
Nücker, N.: In: Proceedings of the International Conference on Lattice Dynamics, Balkansky, M. (ed.), p. 244. Paris: 1978
Wang, X.W., Harmon, B.N., Chen, Y., Ho, K.-M., Stassis, C., Weber, W.: Phys. Rev. B33, 3851 (1986)
Andres, K.: Phys. Rev.168, 708 (1968)
Merkau, B., Holzapfel, W.B.: Physica B139/140, 251 (1986)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bohn, H., Eichler, A. Specific heat ofd-hcp and fcc lanthanum under high pressure. Z. Physik B - Condensed Matter 83, 105–111 (1991). https://doi.org/10.1007/BF01314403
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01314403