Since out - of - plane disorder stabilizes the antinodal pseudogap as was shown in our previous study of the normal state, the present results... ▽ More We found that the length of the Fermi arc decreases with increasing out - of - plane disorder by
performing angle resolved
photoemission spectroscopy (ARPES) measurements in the superconducting state of optimally doped R = La and Eu samples of Bi2Sr2 − xRxCuOy.