Superconducting Gap Anisotropy and Quasiparticle Interactions: A Doping Dependent Photoemission Study
J. MesotDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607M. R. NormanMaterials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439Hong DingDepartment of Physics, Boston College, Chestnut Hill, Massachusetts 02467Mohit RanderiaTata Institute of Fundamental Research, Mumbai 400005, IndiaJ. C. CampuzanoDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607Arun ParamekantiTata Institute of Fundamental Research, Mumbai 400005, IndiaH. M. FretwellDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607Adam KaminskiDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607Tsunehiro TakeuchiDepartment of Crystalline Materials Science, Nagoya University, Nagoya 464-01, JapanT. YokoyaDepartment of Physics, Tohoku University, 980-8578 Sendai, JapanT. SatoDepartment of Physics, Tohoku University, 980-8578 Sendai, JapanT. TakahashiDepartment of Physics, Tohoku University, 980-8578 Sendai, JapanT. MochikuNational Research Institute for Metals, Sengen, Tsukuba, Ibaraki 305, JapanK. KadowakiInstitute of Materials Science, University of Tsukuba, Ibaraki 305, Japan
1999en
ABI
Аннотация
Comparing photoemission measurements on Bi2212 with penetration depth data, we show that a description of the nodal excitations of the $d$-wave superconducting state in terms of noninteracting quasiparticles is inadequate, and we estimate the magnitude and doping dependence of the Landau interaction parameter which renormalizes the linear $T$ contribution to the superfluid density. Furthermore, although consistent with $d$-wave symmetry, the gap with underdoping cannot be fit by the simple $\mathrm{cos}{k}_{x}\ensuremath{-}\mathrm{cos}{k}_{y}$ form, which suggests an increasing importance of long range interactions as the insulator is approached.
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