Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.15: Poster

Montag, 18. März 2024, 15:00–18:00, Poster C

Investigating the CDW phases and structural transitions in BaNi₂As₂ by means of Fluctuation Spectroscopy — •Julian Beu¹, Marvin Kopp¹, Markus König², Amir Haghighirad³, Matthieu Le Tacon², and Jens Müller¹ — ¹Institute of Physics, Goethe-University Frankfurt, Frankfurt (Main), Germany — ²MPI CPfS, Dresden, Germany — ³KIT, Karlsruhe, Germany

The link between charge density waves (CDW), spin density waves (SDW) and superconductivity is of interest in the theory of unconventional superconductivity ever since these effects have been found near the superconducting transition of many unconventional superconductors, more recently in the iron-based superconductors. In this work we focus on BaNi₂As₂, a structurally close analogue of the 122 iron-pnictide superconductors, hosting a similar high-temperature structure and structural transitions. In contrast to the iron-pnictides however, no magnetic ordering was observed, and CDW phases replace the SDW phase. Also, there have been reports of an electronic nematic phase above the structural transitions[1], where the electronic system breaks the usual rotational symmetry. We investigate the charge carriers in BaNi₂(As_1−x P_x)₂, analyzing the resistance and noise power spectral density as a function of temperature. The samples are structured with a meander current path by a FIB process in order to increase resistance by at least two orders of magnitude, rendering noise measurements possible. Resistance noise spectroscopy often reveals hidden microscopic characteristics and can help further our understanding of the CDW phases and structural transitions. [1] Phys. Rev. B 106, 144507.

Keywords: Resistance noise spectroscopy; CDW; Superconductors