ARPES measurements show that the 110 K superconductivity in CuC-1234 is driven by underdoped inner CuO2 planes, with outer planes not contributing at Tc, challenging the composite picture for multilayer cuprates.
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High Temperature Superconductivity Dominated by Inner Underdoped CuO$_2$ Planes in Quadruple-Layer Cuprate (Cu,C)Ba$_2$Ca$_3$Cu$_4$O$_{11+\delta}$
ARPES measurements show that the 110 K superconductivity in CuC-1234 is driven by underdoped inner CuO2 planes, with outer planes not contributing at Tc, challenging the composite picture for multilayer cuprates.