Amorphous germanium under high-pressure conditions

F. Coppari (1) , A. Di Cicco (1, 2) , A. Congeduti , J.C. Chervin (1) , F. Baudelet (3) , A. Polian (1)

1 IMPMC - Institut de minéralogie et de physique des milieux condensés
2 CNR-INFM SOFT, Dipartimento di Fisica, Università di Camerino
3 SSOLEIL - Synchrotron SOLEIL

In this work, we address the question of pressure-induced phase transitions in amorphous germanium.We discuss both the pressurization and depressurization cycles on an amorphous film, showing the appearance of various stable and metastable (LDA–HDA) phases by Raman scattering and X-ray absorption spectroscopy. In particular, we report evidence of recrystallization in the metastable ST12 phase driven by the density of voids of the film.

Mots clés: amorphous germanium; phase transition; metallization; X-ray absorption spectroscopy; Raman spectroscopy

Domaines: Autre [cond-mat.other]

F. Coppari, A. Di Cicco, A. Congeduti, J.C. Chervin, F. Baudelet, et al.. Amorphous germanium under high-pressure conditions. High Pressure Research, 2009, 29 (1), pp.103-107. ⟨10.1080/08957950802628190⟩. ⟨hal-00425570⟩