Each chequerboard plaquette contains approximately two holes, and exhibits a stripy internal structure that has strong influence on the superconducting features. Even in the insulating sample, we observe a smooth crossover from the Mott insulator to superconductor-type spectra on small islands with chequerboard order and emerging quasiparticle interference patterns following the octet model. To elucidate the microscopic processes of pairing and phase ordering in cuprates, here we use scanning tunneling microscopy to image the evolution of electronic states in underdoped $\rm Bi_2La_xSr_$. It has been proposed that pairing and phase coherence may occur separately in cuprates, and $T_c$ corresponds to the phase coherence temperature controlled by the superfluid density. Being doped Mott insulators, the cuprates are known to have low superfluid density, thus are susceptible to phase fluctuations. To account for the high $T_c$, the attractive pairing interaction is expected to be strong and the coherence length is short. The cuprate high critical temperature ($T_c$) superconductors, in contrast, belong to a distinctively different category. Download a PDF of the paper titled The emergence of global phase coherence from local pairing in underdoped cuprates, by Shusen Ye and 7 other authors Download PDF Abstract:In conventional metal superconductors such as aluminum, the large number of weakly bounded Cooper pairs become phase coherent as soon as they start to form.
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