Anomalous femtosecond quasiparticle dynamics of hidden order state in URu2Si2

Georgi L. Dakovski,1 Yinwan Li,2 Steve M. Gilbertson,1 George Rodriguez,1 Alexander V. Balatsky,3 Jian-Xin Zhu,4 Krzysztof Gofryk,2 Eric D. Bauer,2 Paul H. Tobash,2 Antoinette Taylor,5 John L. Sarrao,2 Peter M. Oppeneer,6 Peter S. Riseborough,7 John A. Mydosh,8 and Tomasz Durakiewicz2,* 1Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 2Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 3Theoretical Condensed Matter Physics Group and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 4Physics of Condensed Matter and Complex Systems Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 5Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 6Department of Physics and Astronomy, Uppsala University, Box 516, S-75120 Uppsala, Sweden 7Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA 8Kamerlingh Onnes Laboratory, Leiden University, NL-2300 RA Leiden, The Netherlands (Received 15 August 2011; revised manuscript received 21 September 2011; published 14 October 2011)