Friday, September 5, 2008, 10:00 am — Small Seminar Room, Bldg. 510
The superconducting phase of the high-Tc cuprates has been thought to be described by a single d-wave paring order parameter. Recently, there has been growing evidence suggesting that another form of order, possibly inherited from the pseudogap above Tc, may coexist with superconductivity in the underdoped regime. Through a combined study of angle-resolved photoemission spectroscopy and scanning tunneling microscopy, we observed two distinct gaps (a small-gap and a large gap) that coexist both in antinodal region and in real space in the superconducting phase of Bi2Sr2-xLaxCuO6+δ. We show that small-gap is associated with superconductivity and large-gap persists to temperature above Tc and is found to be linked to short-rage charge ordering. A strong, short-ranged correlation between the local small- and large-gap magnitudes suggesting that the superconductivity and charge ordering are driven by similar physical processes
Hosted by: Peter D. Johnson
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