Regensburg 2013 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 53: Correlated Electrons: Heavy Fermions
TT 53.1: Talk
Thursday, March 14, 2013, 09:30–09:45, H19
Formation of the coherent heavy fermion liquid at the ‘hidden order’ transition in URu2Si2 — Shouvik Chatterjee1, •Jan Trinckauf2, Torben Hänke2, Daniel E. Shai1, John W. Harter1, Travis J. Williams3, Graeme M. Luke3, Kyle M. Shen1,4, and Jochen Geck2 — 1Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, USA — 2Leibniz Institute for Solid State and Materials Research IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany — 3Dept. of Physics and Astronomy, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada — 4Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA
We present angle-resolved photoemission (ARPES) spectra of the heavy-fermion superconductor URu2Si2. Detailed measurements as a function of both excitation photon energy and temperature allow us to disentangle a variety of spectral features, revealing the evolution of the low energy electronic structure at the hidden order transition. We directly observe that precisely at THO, localized and fluctuating electronic states rapidly hybridize with light conduction states, forming a well-defined heavy band coincident with a dramatic reduction in the scattering rate. We thereby demonstrate that in URu2Si2, the formation of the coherent heavy fermion liquid occurs via a thermodynamic phase transition into the HO phase. This behavior is in stark contrast with the gradual crossover expected in Kondo lattice systems, suggesting the possibility of multiple pathways towards the creation of heavy fermionic states.