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FM: Fachverband Funktionsmaterialien
FM 10: Crystal Defects and Real Structure Physics in Diamond and Functional Materials II
FM 10.5: Vortrag
Dienstag, 10. März 2026, 15:15–15:30, BEY/0E40
On the origin of the strange metal Hall effect in BaFe2(As1-xPx)2 — •Augusto Ghiotto1, Darian Hall1, Yuanqi Lyu1, Kohtaro Yamakawa1, John Singleton2, and James Analytis1 — 1University of California, Berkeley, USA — 2National High Magnetic Field Laboratory's Pulsed Field Facility at Los Alamos, USA
BaFe2(As1-xPx)2 is an unconventional superconductor in which the antiferromagnetic, nematic and structural order is suppressed by isovalent P substitution, leading to a quantum critical point at x = 0.31. It has been shown that the Hall effect of the overdoped series contains an anomalous contribution arising from the correlations within the strange metal, whose behavior emanates from a quantum critical point and, in the zero-temperature limit, decays together with the superconducting critical temperature. Here, we present new data on the underdoped series taken at pulsed high magnetic fields. To achieve a large signal to noise ratio and an accurate measurement of the Hall coefficient, we microstructured the crystals into well-defined Hall bars. In this talk, we will draw parallels between the Hall effect in the ordered state and in the strange metal.
Keywords: Iron-based superconductors; Quantum critical point; Strange metal; Hall effect; FIB microstructure