Compositional superlattices based on PtCl/PtBr MX materials

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7122611

Saxena, A; Huang, X Z; Bishop, A R

We consider theoretically a novel class of compositional superlattices consisting of alternating layers of quasi-one-dimensional (QlD) MX (halogen-bridged, transition metal) chain materials. In particular, we have studied a superlattice based on the PtCl/PtBr unit where the Peierls band gap for PtCl is [approximately]2.4 eV and [approximately]1.5 eV for PtBr. We have calculated electronic properties, optical absorption and vibrational properties (e.g. Raman spectrum) of an MX superlattice using a discrete, two-band, tight-binding Peierls-Hubbard model. The electronic band structure reveals a typical subband structure and varies with the relative lengths of the constituent PtCl and PtBr units. The MX superlattice can be thought of as an analog of a GaAs/GaAl[sub x]As[sub 1-x] compositional superlattice but with the added feature that the optical, transport and various other physical properties are modified due to presence of nonlinear excitations (e.g. polarons) in the doped samples.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7122611
• Report Number(s): LA-UR-92-3249; CONF-9208132--8; ON: DE93003700
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
665000 -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
BAND THEORY
BROMIDES
BROMINE COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
DATA
ELECTRONIC STRUCTURE
HALIDES
HALOGEN COMPOUNDS
INFORMATION
NUMERICAL DATA
PHONONS
PLATINUM BROMIDES
PLATINUM CHLORIDES
PLATINUM COMPOUNDS
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
SUPERLATTICES
THEORETICAL DATA
TRANSITION ELEMENT COMPOUNDS