Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Correlated Electrons: Quantum-Critical Phenomena
TT 19.2: Vortrag
Dienstag, 26. Februar 2008, 14:15–14:30, H 3010
Universal ratios of the phase diagram of Pomeranchuk instability: application to Sr3Ru2O7 — •hiroyuki yamase — Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
We analyze a pure forward scattering model, which exhibits spontaneous d-wave type Fermi surface deformations, the so-called Pomeranchuk instability. The phase diagram is known to be determined by a single energy scale in the weak-coupling limit, and thus dimensionless ratios of different characteristic quantities are universal[1]. We extend such a weak-coupling analysis to the presence of a magnetic field, which is a minimal model for Sr3Ru2O7, and compare obtained universal ratios with those provided by experiments[2].
[1] H. Yamase, V. Oganesyan, and W. Metzner, Phys. Rev. B 72, 035114 (2005).
[2] H. Yamase, Phys. Rev. B 76, 155117 (2007).