Berlin 2008 – wissenschaftliches Programm
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SYPT: Symposium Quantum Phase Transitions
SYPT 1: SYPT
SYPT 1.1: Hauptvortrag
Montag, 25. Februar 2008, 14:00–14:35, H 0105
Dark order in the metallic state — •Andrew John Schofield — School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom
Recent years have seen a growing number of materials which exhibit thermodynamic phase transitions between metallic states where the order parameter distinguishing these metals is transparent to current probes. Understanding the nature of this “Dark Order” remains an important challenge. Here we focus on Sr3Ru2O7 which shows a dark order state in the vicinity of the metamagnetic quantum critical endpoint whose existence relies on extreme sample purity [1]. There we proposed that the dark order might be a Pomeranchuk distorted metal. I will review the current status of this and discuss recent work calculating the disorder dependence of such an instability [2]. We show that Tc for a Pomeranchuk distortion shows the same disorder dependence as an unconventional superconductor with finite angular momentum pairing. This then provides an experimental signature pointing towards the identification of this exotic state of matter.
[1] S. A. Grigera, P. Gegenwart, R. A. Borzi, F. Weickert, A. J. Schofield, R. S. Perry, T. Tayama, T. Sakakibara, Y. Maeno, A. G. Green, A. P. Mackenzie Science 306, 1154-1157 (2004).
[2] A. F. Ho and A. J. Schofield: arXiv:0706.1955