Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 56: CE: Heavy Fermions
TT 56.1: Talk
Thursday, March 17, 2011, 16:30–16:45, HSZ 105
Symmetry enhancement at Kondo destroyed quantum critical points — •S. Kirchner1,2, J.H. Pixeley3, and Q. Si3 — 1Max-Planck-Institut PKS, Dresden, Germany — 2Max-Planck-Institut CPfS, Dresden, Germany — 3Physics & Astronomy, Rice University, Houston, USA
Recent studies in quantum critical heavy fermion metals have pointed towards
a global phase diagram [1].
There is growing experimental evidence, that
rare earth intermetallic systems in the vicinity of a
quantum critical point show a linear in temperature
magnetic and single-particle relaxation rate[2].
Among the proposed mechanisms is the critical destruction of the Kondo effect.
We address this issue in several quantum impurity systems by a combination
of techniques and determine the full scaling functions. In each case,
the quantum relaxational regime is characterized by linear-in-temperature
relaxation rates. This is naturally explained in terms of an emerging
conformal symmetry at the quantum critical point that is absent in the
bare models[3,4,5].
Q. Si & F. Steglich, Science 329, 1161 (2010).
A. Schröder et al., Nature (London) 407, 351 (2000); S. Friedemann et al.
Proc. Natl. Acad. Sci. USA 107, 14547 (2010).
S. Kirchner & Q. Si, Phys. Rev. Lett. 100, 026403 (2008).
M. T. Glossop, S. Kirchner, J. H. Pixley and Q.Si, arXiv:0912.4521, to be published (2010).
J. H. Pixley, S. Kirchner and Q.Si, arXiv:1010.3024, to be published (2010).