Kalendarz wydarzeń

Krakow Condensed Matter Seminar: "Uneven dxz and dyz orbital occupation in the superconducting state of iron pnictide from the Eu(Fe1−xCox)2As2 family"
Środa, 12. Maj 2021, 09:00

It is our pleasure to invite you to attend the Krakow Condensed Matter Seminar which will be held on Wednesday, May 12 at 9.00 am. The talk will be given online via UPeL. You can participate in the meeting via the link below:

https://upelagh.clickmeeting.com/krakow-condensed-matter-upel-seminar 

The lecture entitled "Uneven dxz and dyz orbital occupation in the superconducting state of iron pnictide from the Eu(Fe1−xCox)2As2 family" will be given by dr hab. inż. Damian Rybicki, prof. AGH (AGH).

Abstract:

The origin of nematicity and its relation to superconductivity in iron pnictide high-temperature superconductors remains unclear. One of its possible sources is the uneven occupation of Fe dxz and dyz orbitals. Here, by using X-ray linear dichroism technique we show that such an imbalance is present in Eu(Fe1−xCox)2As2 single crystals deep in the tetragonal phase and also in the superconducting state, where we find that dxz orbital has a higher occupation as indicated by XLD magnitude of 1.5%. Our result shows the importance of orbital polarization in the theoretical description of nematicity and superconductivity, particularly for determination of the superconducting gap symmetry, which is affected by orbital fluctuations. We note that measurements were conducted in the SOLARIS synchrotron.

This work was supported by the National Science Centre of Poland grant no 2018/30/E/ST3/00377.

Miejsce : online seminar