k-space microscopy of CMR manganites
One of the major challenges of contemporary physics is to gain insight into many-body problems such as high
temperature superconductivity displayed by e.g. various cuprates. A similar group of materials are the manganites
that display an equally poorly understood phenomenon; at the transition temperature there is a drop in resistivity
of several orders of magnitude accompanied by a para- to ferromagnetic transition. This is called the colossal
magnetoresistant (CMR) effect.
In the QEM group we investigate the bilayered CMR manganite
La2-2xSr1+2xMn2O7 (LSMO), with various doping levels by means of
angle resolved photoemission. In order to do so,
we use our own lab system, the FAMoS, and synchrotron radiation provided by BESSY (Berlin, DE - see image below center)
and the SLS (Villigen, CH). A measurement of the Fermi surface of LSMO is shown below left as well as a typical
energy distribution map in the XMY-direction. The single crystals measured are home-grown
with an optical floating zone furnace by YingKai Huang, the crystal grower in our group.
1.) Fermi surface of LSMO |
2.) BESSY synchrotron |
3.) EDM in the XMY-direction |
This project is the main focus of the PhD research carried out by Sanne de Jong. For more information, please contact Sanne de Jong
