Accession Number:

ADA604483

Title:

Probing Nanoscale Ferroelectricity by Ultraviolet Raman Spectroscopy

Descriptive Note:

Journal article

Corporate Author:

PENNSYLVANIA STATE UNIV STATE COLLEGE DEPT OF PHYSICS

Report Date:

2006-09-15

Pagination or Media Count:

4.0

Abstract:

We demonstrated that ultraviolet Raman spectroscopy is an effective technique to measure the transition temperature Tc in ferroelectric ultrathin films and superlattices. We showed that one-unit-cell-thick BaTiO3 layers in BaTiO3SrTiO3 superlattices are not only ferroelectric with Tc as high as 250 kelvin but also polarize the quantum paraelectric SrTiO3 layers adjacent to them. Tc was tuned by 500 kelvin by varying the thicknesses of the BaTiO3 and SrTiO3 layers, revealing the essential roles of electrical and mechanical boundary conditions for nanoscale ferroelectricity.

Subject Categories:

  • Electricity and Magnetism
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE