1999/11/09 by T. Dahm, Thomas Dahm · 1 citation
Materials Science · Physics and Astronomy · #Condensed matter physics #Coupling (piping) #Cuprate #Deuterium #Exponent #Isotope #Kinetic isotope effect #Magnetic and transport properties of perovskites and related materials #Materials science #Phenomenological model #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum mechanics #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.61.6381
published as Phys. Rev. B 61, 6381 (2000) · 6 pages, 3 Postscript figures, submitted to Phys. Rev. B
arxiv created 1999/11/09 · openalex publication_date 2000/03/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the question of whether the unusual doping dependence of the isotope exponent observed in underdoped high-Tc superconductors might be related to another unusual phenomenon observed in these systems: the pseudogap phenomenon. Within different approximations we study the influence of a phenomenological pseudogap on the isotope exponent and find that it generally strongly increases the isotope exponent, in qualitative agreement with experiments on underdoped high-Tc compounds. This result is stable against strong-coupling self-energy corrections and also holds for recently proposed spin-fluctuation exchange models, if a weak additional electron-phonon coupling is considered.