Abstract
We report measurements of the de Haas–van Alphen effect in in magnetic fields extending to , well above the Néel critical field of . The unreconstructed Fermi surface sheet is observed in the high magnetic field polarized paramagnetic limit, but with its effective mass and Fermi surface volume strongly reduced in size compared to that observed in the low magnetic field paramagnetic regime under pressure. The spheroidal topology of this sheet provides an ideal realization of the transformation from a “large Fermi surface” accommodating electrons to a “small Fermi surface” when the -electron moments become polarized.
- Received 16 April 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.056401
©2007 American Physical Society