%0 Journal Article
%T Initial Structure Memory of Pressure-Induced Changes in the Phase-Change Memory Alloy Ge2Sb2Te5
%+ Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM)
%+ Center for Applied Near-Fiield Optics Research (CanFor)
%+ Laboratoire des colloïdes, verres et nanomatériaux (LCVN)
%+ European Synchrotron Radiation Facility (ESRF)
%A Krbal, Milos
%A Kolobov, Alex, V.
%A Haines, Julien
%A Fons, Paul
%A Levelut, Claire
%A Le Parc, Rozenn
%A Hanfland, Michael
%A Tominaga, J.
%A Pradel, Annie
%A Ribes, Michel
%< avec comité de lecture
%@ 0031-9007
%J Physical Review Letters
%I American Physical Society
%V 103
%P 115502
%8 2009-09-09
%D 2009
%R 10.1103/PhysRevLett.103.115502
%Z 61.50.Ks; 61.05.cp; 62.50.-p; 81.30.Hd
%Z Physics [physics]/Condensed Matter [cond-mat]/Disordered Systems and Neural Networks [cond-mat.dis-nn]Journal articles
%X We demonstrate that while the metastable face-centered cubic (fcc) phase of Ge2Sb2Te5 becomes amorphous under hydrostatic compression at about 15 GPa, the stable trigonal phase remains crystalline. Upon higher compression, a body-centered cubic phase is obtained in both cases around 30 GPa. Upon decompression, the amorphous phase is retained for the starting fcc phase while the initial structure is recovered for the starting trigonal phase. We argue that the presence of vacancies and associated subsequent large atomic displacements lead to nanoscale phase separation and loss of initial structure memory in the fcc staring phase of Ge2Sb2Te5.
%G English
%L hal-00434398
%U https://hal.science/hal-00434398
%~ CNRS
%~ UNIV-MONTP1
%~ UNIV-MONTP2
%~ ENSC-MONTPELLIER
%~ ICG
%~ LCVN
%~ CHIMIE
%~ UNIV-MONTPELLIER
%~ ANR
%~ UM1-UM2
%~ TEST2-HALCNRS