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MA: Fachverband Magnetismus
MA 11: Electron Theory of Magnetism and Correlations (joint session MA/TT)
MA 11.6: Vortrag
Montag, 9. März 2026, 16:15–16:30, POT/0151
T-linear and quadratic transport across the Cuprate and Nickelate phase diagram : pseudogap, strange-metal and Fermi-liquid — •Dongwook Kim1, Motoharu Kitatani2, Juraj Krsnik3, and Karsten Held4 — 1Wiedner Hauptstraße 8-10, 1040 Wien — 23-2-1 Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan — 3Trg Republike Hrvatske 14. HR-10000 Zagreb Croatia — 4Wiedner Hauptstraße 8-10, 1040 Wien
We investigate DC resistivity and nodal quasiparticle (QP) scattering in hole-doped cuprates-nickelate type superconductors by ladder dynamical vertex approximation (LDΓA). In the pseudogap regime of doping δ=0.1-0.175, we observe a crossover from T-linear to T2 resistivity at low T. For dopings δ=0.2-0.25, the resistivity remains fully T-linear down to the lowest temperatures, indicating strange-metal behavior associated with a nearby quantum critical point (QCP). At higher doping of δ = 0.3 the T2 recovery reappears, signaling exit from the quantum-critical regime. The nodal QP scattering rate and the first-Matsubara-frequency rule analysis independently confirm the same FL*NFL crossover, providing consistent support for the T-dependent transport obtained within LDΓA
Keywords: high temperature superconductor; nickelate superconductor; unconventional superconductor; strange metal; pseudogap