Crossover region between nodal and antinodal states at the Fermi level of optimally doped and overdoped Bi2Sr1.6Nd0.4CuO6+delta

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    T-C SUPERCONDUCTOR;    CUPRATE SUPERCONDUCTORS;    UNDERDOPED BI2212;    COOPER PAIRS;    ENERGY GAPS;    PSEUDOGAP;    BI2SR2CACU2O8+DELTA;    ARCS;    SURFACE;   

DOI  :  10.1103/PhysRevB.81.184527

来源: SCIE

【 摘 要 】

We have studied Bi2Sr1.6Nd0.4CuO6+delta using angle-resolved photoemission spectroscopy in the optimal and overdoped regions of the phase diagram. We identify a narrow crossover region in the electronic structure between nodal and antinodal regions associated with the deviation from a pure d-wave gap function, an abrupt increase in the quasiparticle lifetime, the formation of Fermi arcs above T-c, and a sudden shift of the bosonic mode energy from higher energy, similar to 60 meV, near the nodal direction, to lower energy, similar to 20 meV, near the antinodal direction. Our work underscores the importance of a unique crossover region in the momentum space near E-F for the single-layered cuprates, between nodal and antinodal points, that is independent of the anti-ferromagnetic zone boundary.

【 授权许可】

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