title: Inversion and suppression of an oxygen bulk phase transition in confined geometry.
abstract: By means of susceptibility experiments on oxygen confined to the pores of a Gelsil substrate we investigated the bulk gamma- beta transition. At low fillings, the transformation is completely suppressed. At higher but still incomplete filling we observe a partial transformation from gamma to beta on cooling and a subsequent inverted transition on heating, i.e. the transformation of gamma-phase material into the beta-phase upon heating. At 100% filling this inversion disappears. We discuss our results on the basis of geometric considerations.
authors.affiliation: Universität des Saarlandes, Technische Physik, 66123 Saarbrücken, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Ackermann
authors.forename: M
authors.initials: M
authors.lastname: Enderle