national high magnetic field laboratory


the future



Neil Harrison



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at Los Alamos National Laboratory,

we have the world’s only scientific program that has delivered scientific results in non-destructive magnetic fields up to and exceeding 100 tesla. Fields of this strength have proved to be an indispensable tool for mapping the Fermi surface topology of underdoped high temperature superconductors and identifying new types of order in magnetic materials. A broad variety of experimental techniques can be performed in fields extending to 100 tesla, including contactless conductivity, magnetotransport, magnetization, magnetostriction, magnetic torque and optics. We specialize in conducting multiple experiments in parallel in order to make the most effective use of the strong magnetic fields, which cost considerably more to produce then conventional pulsed magnetic fields.



Magnetic quantum oscillations measured in an underdoped high Tc superconductor to fields exceeding 100 tesla using the contactless conductivity technique. The beat pattern likely originates from the combined effects of bilayer splitting and magnetic breakdown tunneling at the nodes. Extensive experiments in tilted magnetic fields confirm this hypothesis.

An example of the upper critical field measured along two distinct crystalline axes in iron-arsenide-based high Tc superconductor. Despite the considerable anisotropy in the critical fields at high temperatures, the upper critical fields becomes isotropic at low temperatures. The latter implies that these materials are likely to be better candidates for applications in high field magnets than the cuprates.

schematic cross-section of the 100T magnet

Measurements of the magnetization (upper panel) and magnetostriction (lower panel) in LaCoO3, revealing the existence of a new type of field-induced magnetic ordering involving different spin states of Co. The inset to the upper panel shows more extensive measurements of the hysteresis at the lower transition between rising and falling fields. The inset to the lower panel shows a peak in the susceptibility measured in a single turn magnet system (the two transitions being merged into one at high sweep rates).

100T magnetic field pulse