We report measurements of the de Haas-van Alphen effect in CeIn3 in magnetic fields extending to ≈ 90 T, well above the Néel critical field of µ0Hc ≈ 61 T. The unreconstructed Fermi surface asheet 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.Strong magnetic fields are an indispensable tool for studying the energy scales relevant to antiferromagnetism. By polarizing their magnetic moments, they deplete the system of available spin degrees of freedom for staggered ordering. In f -electron antiferromagnets, polarization is expected to be accompanied by the effective removal of the f -electron degrees of freedom from the Fermi surface (FS) [1, 2, 3], enabling access to the underlying electronic structure in its simplest form. The f -electron system CeIn 3 provides an essential paradigm to understand universal aspects of the relationship between antiferromagnetism and unconventional superconductivity− given the magnetic simplicity of this non-metamagnetic cubic system [2, 4] compared to CeRu 2 Si 2 [5], CeB 6 [6] or CeRhIn 5 [7] due to the absence of metamagnetism. Universal behavior is realized in CeIn 3 by the application of pressure, whereupon antiferromagnetism is suppressed and superconductivity [8] and a heavy fermion behavior emerge [9]. If NdB 6 provides a model example of a cubic system in which the hybridization between the f -electrons and conduction electrons remains negligible throughout [10], then CeIn 3 may be considered as the model system for understanding antiferromagnetism preceding superconductivity in the opposite strongly correlated regime comprising heavy quasiparticles [11,12].

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Abstract-The first 100 T non-destructive (100 T ND) magnet and power supplies as currently designed are described. This magnet will be installed as part of the user facility research equipment at the National High Magnetic Field Laboratory (NHMFL) Pulsed Field Facility at Los Alamos National Laboratory. The 100 T ND magnet will provide a 100 T pulsed field of 5 ms duration (above 90% of full field) in a 15 mm diameter bore once per hour. Magnet operation will be nondestructive. The magnet will consist of a controlled power outer coil set which produces a 47 T platform field in a 225 mm diameter bore. Located within the outer coil set will be a 220 mm outer diameter capacitor powered insert coil. Using inertial energy storage a synchronous motor/generator will provide ac power to a set of seven ac-dc converters rated at 64 MW/80 MVA each. These converters will energize three independent coil circuits to create 170 MJ of field energy in the outer coil set at the platform field of 47 T. The insert will then be energized to produce the balance of the 100 T peak field using a 2.3 MJ, 18 kV (charged to 15 kV), 14.4 mF capacitor bank controlled with solidstate switches. The magnet will be the first of its kind and the first non-destructive, reusable 100 T pulsed magnet. The operation of the magnet will be described along with special features of its design and construction.Index Terms-high field, pulsed magnet, 100 tesla

1 1 Abstract--The design, analysis and fabrication progress of the 100 T Multi-Shot Magnet is described. The description includes the structural analysis of the outer coil set, the fabrication of the 100 T prototype coil 1, the fabrication of a coil 1 test shell, and the analysis of the electrical busbar assembly. Fabrication issues and their solutions are presented. This magnet will be installed as part of the user facility research equipment at the U.S. National High Magnetic Field Laboratory (NHMFL) Pulsed Field Facility at Los Alamos National Laboratory.Index Terms--high field, pulsed magnet, 100 tesla