Ferroelectricidad en la escala atómica basada en aislantes iónicos tipos salroca

Schubert, Sonja
Serrate Donoso, David (dir.) ; Piantek, Marten (dir.)

Universidad de Zaragoza, CIEN, 2016
Departamento de Física de la Materia Condensada, Área de Física de la Materia Condensada

Máster Universitario en Física y Tecnologías Físicas

Resumen: Ferroelectricity at atomic scale has been recently shown in ultrathin layers of NaCl on Cu2N/Cu(001). The origin was suppossed to be the strain of NaCl. In this thesis, the two rocksalt compounds KBr and LiCl were investigated with respect to their growth behaviour on Cu(001) and the polar insulator Cu2N/Cu(001). Furthermore the electronic structure and the ferroelectric behaviour of KBr is described. In gap-states due to the hybridisation with Cu(001) were found at KBr/Cu(001), which are suppressed due to the adding of Cu2N. Surprisingly, also without a strain, ultrathin layers of KBr on Cu2N/Cu(001)shows ferroelectrism. In this thesis we applied the following experimental techniques: Scanning Tunneling Microscopy(STM), Scanning Tunneling Spectroscopy(STS), Atomic Force Microscopy(AFM), Kelvin-Probe-Spectroscopy and Low Energy Electron Refraction(LEED). LiCl was investigated at ultra high vacuum and room temperature, KBr at ultra high vacuum and 4K.

Tipo de Trabajo Académico: Trabajo Fin de Master