Naslov
Universal sheet resistance and revised phase diagram of the cuprate high-temperature superconductors

Autori
Barišić, Neven ; Chan, Mun K. ; Li, Y. ; Yu, G. ; Zhao, X. ; Dressel, M. ; Smontara, Ana ; Greven, Martin

Izvornik
Proceedings of the National Academy of Sciences of the United States of America (0027-8424) 110 (2013), 30; 12235-12240

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
cuprates; superconductivty; resistivity; phase diagram

Sažetak
Upon introducing charge carriers into the copper-oxygen sheets of the enigmatic lamellar cuprates the ground state evolves from an insulator to a superconductor, and eventually to a seemingly conventional metal (a Fermi liquid). Much has remained elusive about the nature of this evolution and about the peculiar metallic state at intermediate hole-carrier concentrations (p). The planar resistivity of this unconventional metal exhibits a linear temperature dependence (ρ∝T) that is disrupted upon cooling toward the superconducting state by the opening of a partial gap (the pseudogap) on the Fermi surface. Here we first demonstrate for the quintessential compound HgBa2CuO4+δ a dramatic switch from linear to purely quadratic (Fermi-liquid-like, ρ∝T2) resistive behavior in the pseudogap regime. Despite the considerable variation in crystal structures and disorder among different compounds, our result together with prior work gives new insight into the p-T phase diagram and reveals the fundamental resistance per copper-oxygen sheet in both linear (ρ=A1T) and quadratic (ρ=A2T2) regimes, with A1 ∝ A2 ∝ 1/p. Theoretical models can now be benchmarked against this remarkably simple universal behavior. Deviations from this underlying behavior can be expected to lead to new insights into the non-universal features exhibited by certain compounds.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Rad je djelomicno sufinanciran od prokjekta The UKF project (65/10) “New electronic states driven by frustration in layered materials”.

POVEZANOST RADA