Tunneling spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo></mml:math> Eliashberg analysis of the spectral dip feature
J. F. ZasadzinskiHigh Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USAL. CoffeyPhysics Division, Illinois Institute of Technology, Chicago, Illinois 60616, USAP. RomanoINFM and Facolta di Scienze, Universita del Sannio, Via Port′Arsa 11, I-82100 Benevento, ItalyZ. YusofHigh Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
2003lv
ABI
Annotatsiya
Eliashberg strong-coupling theory, extended to a d-wave symmetric gap function, is used to fit quantitatively a published tunneling spectrum of ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ near optimal doping. The shape, location, and strength of the high-bias spectral dip feature is adequately reproduced using a single-peak ${\ensuremath{\alpha}}^{2}F(\ensuremath{\omega})$ centered at 36.5 meV. ${\ensuremath{\alpha}}^{2}F(\ensuremath{\omega})$ also self-consistently determines the measured gap value $\ensuremath{\Delta}=32\mathrm{meV}.$ Possible origins of the bosonic spectrum that give rise to high-${T}_{C}$ superconductivity are discussed.
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