FeSe films grown by DC sputtering: thickness dependence of the physical properties

Datum

25.04.2018

Zeit

09:45 - 10:45

Sprecher

Ph.D. María Victoria Ale Crivillero

Zugehörigkeit

Low Temperature Lab Bariloche, Argentina

Sprache

en

Hauptthema

Materialien

Andere Themen

Materialien, Physik

Host

Ines Firlle

Beschreibung

Among the iron-based superconductors, iron selenide stands out as a rich system for studying new emergent phenomena. Particular interest has been triggered by the multi-band electronic structure and the nematic phase transition without magnetic order at 90K. The reports of superconductivity above 65K in extremely thin FeSe films has also triggered great enthusiasm. In this context, fundamental questions concerning interfacial effects are still open. In this talk, I will discuss the thickness effects in the electronic properties of FeSe films grown by DC magnetron sputtering [1]. We report a superconductor-insulator transition (SIT) by reducing the thickness as a general feature of sputtered FeSe films. Similar results have been interpreted in terms of a continuous quantum phase transition induced by disorder [2]. In our samples, this scheme becomes inappropriate due to the evolution of the structural properties and morphology. In the limit of textured thick films, the critical temperature takes values slightly higher than that expected for bulk FeSe, Tc~12K. The electronic structure in the normal state was explored by performing magneto-transport and Hall experiments, finding features associated with nematic fluctuations despite the presence of disorder. [1] M.V. Ale Crivillero et al.; arXiv:1801.08489 (2018). [2] R. Schneider et al.; Phys. Rev. Lett.108, 257003 (2012).

Links

• Seminars at the IFW

Letztmalig verändert: 25.04.2018, 09:45:54