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Cleaved surfaces of Bi 2.1 Sr 1.8 Ca(Cu 1-x Co x ) 2 O 8+y (x=0.04) have been investigated by STM/STS at cryogenic temperatures. The obtained conductance image, which maps the local density of states (LDOS) near the Fermi level, clearly showed Co impurities present in the CuO 2 planes, indicating that the...
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