Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.15: Poster
Monday, March 18, 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(As1−x Px)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