Abstract
151Eu-Mössbauer spectroscopy is used to study the ternary intermetallics EuM2Ge2 (M=Ni, Pd, Pt), in which Eu is divalent, and EuNi2Si2 as a trivalent reference system in the pressure range 0–31 GPa. In EuNi2Ge2 and EuPd2Ge2, one observes a valence transition from Eu2+ to Eu3+ around 5 and 25 GPa, accompanied by a change in isomer shift of 9.3 and 10.1 mm/s, respectively. These are the largest pressure-driven changes in isomer shift for151Eu-spectroscopy observed up to now.
Similar content being viewed by others
References
D.T. Androja and S.K. Malik, J. Magn. Magn. Mater. 100(1991)126.
E.R. Bauminger, G.M. Kalvius and I. Nowik, Isomer shifts in rare earths, in:Mössbauer Isomer Shifts, eds, G.K. Shenoy and F.E. Wagner (North-Holland) p. 663.
I. Nowik, Hyp. Int. 13(1983)89.
E.R. Bauminger, D. Froindlich, I. Nowik and S. Ofer, Phys. Rev. Lett. 30(1973)1053.
E.V. Sampathkumaran, R. Vijayaraghavan, K.V. Gopalakrishnan, R.G. Pilley and H.G. Devare, in:Valance Fluctuations in Solids, eds. L.M. Falicov, W. Hanke and M.B. Maple (North-Holland, 1981) p. 193.
J. Röhler, D. Wohlleben, G. Kaindl and H. Balster, Phys. Rev. Lett. 49(1982)65.
D. Stöber, Ch. Sauer, W. Zinn and M.M. Abd-Elmeguid, J. Magn. Magn. Mater. 69(1987)144.
G. Wortmann, I. Norwik, B. Perscheid, G. Kaindl and I. Felner, Phys. Rev. B43(1991)5261.
C.M. Varma, Rev. Mod. Phys. 48(1976)219.
G. Wortmann, Hyp. Int. 47(1989)179.
B. Chevallier, J.M. Coey, B. Lloret and J. Etourneau, J. Phys. C19(1986)4521.
R.D. Taylor and M.P. Pasternak, Hyp. Int. 53(1990)159.
I. Das, E.V. Sampathkumaran, R. Nagarajan and R. Vijayaraghavan, Phys. Rev. B43(1991)13159.
I. Nowik, E.V. Sampathkumaran and G. Kaindl, Sol. State Commun. 55(1985)721.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Hesse, H.J., Wortmann, G. 151Eu-Mössbauer study of pressure-induced valence transitions in EuM2Ge2 (M=Ni,Pd,Pt). Hyperfine Interact 93, 1499–1504 (1994). https://doi.org/10.1007/BF02072899
Issue Date:
DOI: https://doi.org/10.1007/BF02072899