Fermi surface of CeIn3 above the Neel critical field

TL;DR

This study investigates the Fermi surface of CeIn3 at high magnetic fields above the Neel critical field, revealing a transition from a large to a small Fermi surface with reduced effective mass and volume, illustrating f-electron polarization effects.

Contribution

It provides direct experimental evidence of Fermi surface transformation in CeIn3 under high magnetic fields, highlighting the change from a large to a small Fermi surface due to f-electron polarization.

Findings

Fermi surface remains unreconstructed above the critical field

Effective mass and volume of the Fermi surface are strongly reduced

Fermi surface topology is spheroidal, indicating a transition from large to small Fermi surface

Abstract

We report measurements of the de Haas-van Alphen effect in CeIn3 in magnetic fields extending to ~90 T, well above the Ne'el critical field of Hc ~61 T. The unreconstructed Fermi surface a-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 f-electrons to a `small Fermi surface' when the f-electron moments become polarized.