Nature uses only the longest threads to weave her patterns, so that each small piece of her fabric reveals the organization of the entire tapestry.
Richard P. Feynman
Herbert Jaeger Faculty Profile »


Research Area:

Condensed matter physics, ceramic materials

 

Experiment / Theory:

Experiment

 

Research Summary:

My primary research interest is materials physics, in particular, the physics of ceramic materials. Ceramics belong to a huge class of materials that includes a multitude of compounds, many of which have technologically important applications, such as thermal barrier coating, oxygen sensors, ferroelectric memory chips, and high transition temperature superconductor devices.

 

I use time-differential perturbed angular correlation spectroscopy (PAC) to study structure and defects in ceramic materials on a microscopic level. PAC is a hyperfine interaction method and uses a nuclear probe to measure its interaction with electric and magnetic fields due to surrounding charges and spins. This technique allows the characterization of crystalline order, the study of local defect structures, as well as the investigation of structural and dynamic processes, such as phase transitions, the nature of defects, vacancy migration, etc.

 

Recent Publications:

H. Jaeger and M. O. Zacate, editors, Defects and Diffusion Studied Using PAC Spectroscopy, Defect and Diffusion Forum Vol. 311 (2011).

 

M. O. Zacate and H. Jaeger, Perturbed Angular Correlation Spectroscopy – A Tool for the Study of Defects and Diffusion at the Atomic Scale, to be published in Defect and Diffusion Forum Vol. 308 (2011) pp. 3-38.

 

 

H. Jaeger and S. P. McBride, Perturbed Angular Correlation Measurement of the Electric Field Gradient at 181Ta in ZrSiO4 and HfSiO4, Hyperfine Interactions 177 (2007) 51-56.

 

A. Erlacher, B. Ullrich, E. Y. Komarova, H. Jaeger, H. J. Haugan, and G. J. Brown, Texture and surface analysis of thin-film GaAs on glass formed by pulsed-laser deposition, Journal of Noncrystalline Solids 352 (2006) 193-196.