Conveners
Solid State Physics
- Manfred Deicher (Universität des Saarlandes)
The idea that “new-is-small” reflects a paradigm moving industries and research. New materials, new applications, new technologies, - but what do we need to make the “new”, understandable, applicable and reliable? Clearly, as things go smaller and smaller, it is more difficult to probe at the appropriate scale without influencing the subject of interest. Ideally, one needs tip-less...
Most ferroelectrics are oxides of a number of different crystal classes. Their polar ordering typically arises as soft phonon process with one or more of the ionic entities shifting within the unit cells. This lowers the symmetry into polar symmetry groups. If nuclear probes substitute the inherent ions in the structure, their local environment more or less reflects the crystal symmetry. One...
Mg-doped p-type GaN is nowadays a core component of many optoelectronic devices which we find in our homes, e.g. LEDs for solid state white lighting or blue lasers. Yet there are some basic properties related to p-type doping of GaN that are still poorly understood and also limit the performance of devices. One such major problem is an inherent doping limit: once the Mg concentration in GaN...
The rock-forming alkali feldspars belong to the most abundant minerals in the Earth’s
crust and are formed as a solid solution between the sodium (NaAlSi$_3$O$_8$, albite) and
potassium (KAlSi$_{3}$O$_8$, orthoclase) end-member compositions. Well-founded knowledge
of self-diffusion data in alkali feldspar is a prerequisite for interpreting existing
interdiffusion data that, in turn control...
Rare-earth orthochromites of the formula RCrO$_3$ R=Dy, Pr, Ho, Yb, Er, Y, Lu, Sm are currently at the center of great controversy regarding ferroelectricity. While dielectric constant anomalies near $400-500$ K in the heavier rare-earth chromites were associated with non-centrosymmetry, others claim that the polarization observed in these systems is due to the combined effect of the electric...
