COLLOQUIUM
Institute of Physics Polish Academy of Sciences
 
 


The formal colloquium of the Institute of Physics, Polish Academy of Sciences it the main ongoing periodic series of lectures in physics and related science, of interest to members of the Institute. It is held from 1977. Colloquium speakers are primarily domestic and foreign scholars of established reputation, but also less-known physicists with remarkable and current scientific achievements. The colloquium is held once a month from September to June, usually at 3:15 PM on the last Tuesday of the month in the Auditorium of the Institute of Physics. Colloquia are open to the public, and are preceded by a coffee/the reception at the Institute.

For future information about the colloquia, pleace contact Prof. Dr. hab. Tomasz Dietl (dietl@ifpan.edu.pl), current chairman of the colloquium committee.

NOTICE OF NEXT COLLOQUIUM


We are pleased to announce that on December 19th 2017 (Tuesday) at 15:15 in the Institute of Physics, in the L. Sosnowski's auditorium will be held colloquium of the Institute of Physics PAS, in which:

Prof. Dr. Hugo Keller

from Physik-Institut der Universität Zürich, Zürich, Switzerland, will give a lecture entitled:


Probing fundamental properties of condensed matter systems with positive muons

We cordially invite to attend the colloquium and please to inform other interested persons. Before the colloquium, at 14:45, participants are welcome for coffee, tea and biscuits.

  Colloquium Committee




Abstract


      The muon-spin rotation (μSR) technique is a powerful tool for investigating fundamental magnetic and electronic properties of various condensed matter systems. In this technique the positive muon μ+ serves as a microscopic magnetic probe to detect local magnetic fields in the bulk of a solid. In many cases μSR has provided important information on the microscopic magnetic properties of condensed matter systems, which are hardly obtained with other experimental techniques.

After a brief introduction to the basic principles of the μSR technique, some typical examples of the application of μSR for investigating local magnetic properties of various condensed matter are presented. The following topics are discussed in some detail: magnetic systems (ferro- and antiferromagnetic systems), unconventional high-temperature superconductors (cuprate and iron-based superconductors, vortex matter, coexistence of superconductivity and magnetism, phase diagrams), and multiferroic systems.

The low-energy μSR technique developed at the Paul Scherrer Institute (PSI) is well suited for investigating multilayer structures containing superconducting and insulating (or metallic) layers. Slow positive muons of tunable energy are implanted at a very small and controllable depth below the surface of a sample on a nanometer scale. This allows all the advantages of standard μSR to be obtained in thin samples (films), near surfaces, and as a function of depth below surfaces. In non-metals (e.g. semiconductors) a positive muon μ+ can pick up an electron e- to form muonium (μ+e-) which is a hydrogen-like atom. The μSR technique is an ideal tool to determine the hyperfine coupling constant of muonium in semiconductors, to study muonium diffusion (quantum diffusion) in non-metals, and to test chemical reaction rate theories involving muonium. Some typical examples of muonium research will be briefly discussed.