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Superconductivity-Induced Transfer of In-Plane Spectral Weight in Bi2Sr2CaCu2O8+
H. J. A. Molegraaf,1C. Presura,1D. van der Marel,1*P. H. Kes,2M. Li2
Optical data are reported on a spectral weight transfer
over a broad frequency range of
Bi2Sr2CaCu2O8+, when
thismaterial became superconducting. Using spectroscopic ellipsometry,we observed the removal of a small amount of spectral weight ina broad
frequency band from 104 cm1 to at least
2 × 104 cm1, due to the onset of
superconductivity. We observed a blue shiftof the ab-plane
plasma frequency when the material became superconducting,indicating
that the spectral weight was transferred to the infraredrange. Our
observations are in agreement with models in whichsuperconductivity is
accompanied by an increased charge carrierspectral weight. The
measured spectral weight transfer is largeenough to account for the
condensation energy in these compounds.
1 Materials Science Center, University of
Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands.
2 Kamerlingh Onnes Laboratory, Leiden University,
Post Office Box 9504, 2300 RA Leiden, Netherlands.
*
To whom correspondence should be addressed. E-mail:
d.van.der.marel{at}phys.rug.nl
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PERSPECTIVES
J. E. Hirsch (22 March 2002) Science295 (5563), 2226.
[DOI: 10.1126/science.1070866] |Summary »|Full Text »|PDF »
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, when
this material became superconducting. Using spectroscopic ellipsometry, we observed the removal of a small amount of spectral weight in a broad
frequency band from 104 cm
1 to at least
2 × 104 cm
