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Pressure-induced transformations and superconductivity of amorphous germanium

Barkalov, OI; Tissen, VG; McMillan, PF; Wilson, M; Sella, A; Nefedova, MV; (2010) Pressure-induced transformations and superconductivity of amorphous germanium. PHYS REV B , 82 (2) , Article 020507. 10.1103/PhysRevB.82.020507.

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Abstract

The effect of pressure on amorphous Ge was probed by Raman spectroscopy combined with molecular-dynamics simulations. A large jump occurs in the principal peak position due to nearest-neighbor Ge-Ge vibrations at 11-12 GPa and 7-5.5 GPa, respectively, during increasing/decreasing pressure due to a polyamorphic transition occurring between the low-density amorphous semiconductor and a metallic high-density polyamorph (HDA). We measured the superconducting transition temperature (T-c) using magnetic susceptibility measurements in the diamond anvil cell and determined that T-c for the high-density HDA polyamorph was higher than that for the beta-Sn structured Ge-II crystalline phase.

Type:Article
Title:Pressure-induced transformations and superconductivity of amorphous germanium
DOI:10.1103/PhysRevB.82.020507
Keywords:PHASE-TRANSITION, SYNCHROTRON-RADIATION, CRYSTAL STRUCTURES, RAMAN PHONONS, GE, SILICON, SI, TEMPERATURE, DYNAMICS, LIQUID
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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