Atomic Images and Tunneling Spectra on Bi_2Sr_2CaCu_2O_<8+δ> Cleaved Surface by STM

概要

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Atomic iunages of the Bi -O and Ctr -0 planes were selectively observed in STIVI experimentson slightly underdoped BizSr3CaCtt30g?,5 by changing lcias voltage, and ttrnneling spectra weremeasured while observing the Cu -O plarne at three tip heights (/ut >hc >Aa). The CUT -O planeimages indicate that the conduction holes go nuainly into O 2p. and Cu 3d.c .2 orbitals. Thespectra for /21 and h) are consistent with a gap having lines of nodes at the directions 45' f'romthe Cu -O bonds, as shown in otrr previotrs work, On the other hand, the spectra for h3, wherethe tip seeuns to be very close to the specinaen surface, are quite similar to expectations for thepair-breaking due to non-tnagnetic inaptrrities in a d-wave strpercondtnctor. This, couaabined withthe result for the node directions, strongly strpports a d.w .2 strperconducting gap.
社団法人日本物理学会の論文
1997-06-15