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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.20: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Lifetime of the magnetic resonance mode in high-temperature superconductors — •Davide Valentinis¹, Toshinao Loew², and Joerg Schmalian¹ — ¹Institute for Theoretical Condensed Matter physics, Karlsruhe Institute of Technology, Wolfgang-Gaede Straße 1, 76131 Karlsruhe (DE) — ²Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart (DE)

The spin-resonance collective mode emerges in the electronic spectrum of high-temperature superconductors as a consequence of the sign-changing pairing symmetry of the superconducting gap [1], as measured by inelastic neutron scattering. A detailed study of the spectral lineshape for the spin resonance thus yields valuable insight on the microscopic interactions which promote or compete with pairing [2]. In this work, we analyze new neutron inelastic scattering measurements on YBa₂Co₃O_6.55 in terms of the spin-fermion model near the antiferromagnetic instability in 2 dimensions [3], where self-energy corrections from disorder are treated in Born approximation. We compare quantitatively the calculated temperature dependence of resonance energy and linewidth with experiments, thus inferring characteristic energy scales for pairing and disorder strength.
P. Hlobil, B. Narozhny and J. Schmalian, Phys. Rev. B 88, 205104 (2013)
M. Eschrig, Adv. Phys. 55, 47 (2006)
A. Abanov, A. V. Chubukov and J. Schmalian, Adv. Phys. 52, 119 (2003)