Sum rules and electrodynamics of high - Tc cuprates in the pseudogap state
نویسنده
چکیده
We explore connections between the electronic density of states ~DOS! in a conducting system and the frequency dependence of the scattering rate 1/t(v) inferred from infrared spectroscopy. We show that changes in the DOS upon the development of energy gaps can be reliably tracked through the examination of the 1/t(v) spectra using the sum rules discussed in the text. Applying this analysis to the charge dynamics in highTc cuprates, we find radically different trends in the evolution of the DOS in the pseudogap state and in the superconducting state.
منابع مشابه
نظریه میدان میانگین برای ابررسانایی مسی دمای بالا
Two decades ago the epoch making discovery of high Tc cuprate superconductivity by Bednorz and Müller shocked the world’s superconductivity community. However, already in 1979 and 1980, the first heavy fermion superconductor CeCu2Si2 and organic superconductor (TMTSF)2PF6 have been discovered respectively. Also we know now that all these superconductors are unconventional and nodal. Further t...
متن کاملA model for gap and pseudogap evolution in high-Tc superconductors
We describe the spectral properties of underdoped cuprates as resulting from a momentum-dependent pseudogap in the normal state spectrum. Such a model accounts, within a BCS approach, for the doping dependence of the critical temperature and for the two-parameter leading-edge shift observed in the cuprates. By introducing a phenomenological temperature dependence of the pseudogap, which finds a...
متن کاملUnconventional energetics of the pseudogap state and superconducting state in high-Tc cuprates
Unconventional energetics of the pseudogap state and superconducting state in high-Tc cuprates D. N. Basov, C. C. Homes, E. J. Singley, M. Strongin, T. Timusk, G. Blumberg, and D. van der Marel Department of Physics, University of California, San Diego, La Jolla, California 92093-0319 Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000 Department of Physics, McMast...
متن کاملGap and pseudogap evolution within the charge-ordering scenario for superconducting cuprates
We describe the spectral properties of underdoped cuprates as resulting from a momentumdependent pseudogap in the normal state spectrum. Such a model accounts, within a BCS approach, for the doping dependence of the critical temperature and for the two-parameter leading-edge shift observed in the cuprates. By introducing a phenomenological temperature dependence of the pseudogap, which finds a ...
متن کاملEvidence for crossover from a Bose-Einstein condensate to a BCS-like superconductor with doping in YBa2Cu3O7−δ from quasiparticle relaxation
Time resolved measurements of quasiparticle (QP) relaxation dynamics on the femtosecond timescale are reported as a function of temperature and doping in YBa2Cu3O7−δ for (0.48 < δ < 0.1). In the underdoped state (δ > 0.15), there is no evidence for any changes in the low-energy gap structure at Tc from either photoinduced QP absorption or QP relaxation time data. In combination with the sum rul...
متن کامل