Field-induced fermi surface reconstruction in Na0.5CoO 2
Journal
AIP Conference Proceedings
Journal Volume
1207-1210
Journal Issue
850
Date Issued
2006
Author(s)
Abstract
We have performed electrical transport measurements at low temperatures and high magnetic fields in Na0.5CoO2 single crystals. Shubnikov de Haas oscillations corresponding to only 1 % of the area of the orthorhombic Brillouin zone (BZ) were clearly observed, suggesting that most of the original Fermi surface vanished at the charge ordering (CO) transition. In‐plane magnetic fields were found to suppress strongly the CO state. For fields rotated within the conducting planes, we observe angular magnetoresistance oscillations whose periodicity changes from two‐to six‐fold at the transition. This suggests the field‐induced reconstruction of the Fermi surface upon suppression of the CO‐state. © 2006 American Institute of Physics
Type
conference proceedings