Abstract
To elucidate the underlying nature of the hidden order (HO) state in heavy-fermion compound , we measure electrical transport properties of ultraclean crystals in a high field, low temperature regime. Unlike previous studies, the present system with much less impurity scattering resolves a distinct anomaly of the Hall resistivity at , well below the destruction field of the HO phase . In addition, a novel quantum oscillation appears above a magnetic field slightly below . These results indicate an abrupt reconstruction of the Fermi surface, which implies a possible phase transition well within the HO phase caused by a band-dependent destruction of the HO parameter.
- Received 24 December 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.156403
©2009 American Physical Society