TY - JOUR
T1 - Universal sheet resistance and revised phase diagram of the cuprate high-temperature superconductors
AU - Barisic, Neven
AU - Chan, Mun K.
AU - Li, Yuan
AU - Yu, Guichuan
AU - Zhao, Xudong
AU - Dressel, Martin
AU - Smontara, Ana
AU - Greven, Martin
PY - 2013/7/23
Y1 - 2013/7/23
N2 - 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 (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+d a dramatic switch from linear to purely quadratic (Fermi liquid-like, 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 insight into the p-T phase diagram and reveals the fundamental resistance per copper-oxygen sheet in both linear ( = A1?T) and quadratic ( = A2?T2) 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 insight into the nonuniversal features exhibited by certain compounds.
AB - 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 (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+d a dramatic switch from linear to purely quadratic (Fermi liquid-like, 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 insight into the p-T phase diagram and reveals the fundamental resistance per copper-oxygen sheet in both linear ( = A1?T) and quadratic ( = A2?T2) 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 insight into the nonuniversal features exhibited by certain compounds.
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U2 - 10.1073/pnas.1301989110
DO - 10.1073/pnas.1301989110
M3 - Article
C2 - 23836669
AN - SCOPUS:84880691103
SN - 0027-8424
VL - 110
SP - 12235
EP - 12240
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 30
ER -