Evidence for a delocalization quantum phase transition without symmetry breaking in CeCoIn <sub>5</sub>
Nikola Maksimovic, Daniel Eilbott, Tessa Cookmeyer, Fanghui Wan, Ján Rusz, Vikram Nagarajan, Shannon C. Haley, Eran Maniv, Amanda Gong, Stefano Faubel, Ian Hayes, A. F. Bangura, John Singleton, Johanna C. Palmstrom, Laurel E. Winter, R. McDonald, Sooyoung Jang, Ping Ai, Yi Lin, Samuel Ciocys, Jacob Gobbo, Yochai Werman, Peter M. Oppeneer, Ehud Altman, Alessandra Lanzara, James G. Analytis
Abstract
A gentle reconstruction Changes in the volume of a material’s Fermi surface are typically associated with the breaking of symmetry. Maksimovic et al . found evidence for an unusual type of this Fermi surface reconstruction, one without symmetry breaking, in the heavy fermion compound cerium cobalt indium (CeCoIn 5 ). Doping the material with tin led to abrupt changes in Hall effect, quantum oscillation, and photoemission signals. The researchers interpret the findings in terms of the delocalization of f-electrons associated with cerium atoms. —JS