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- Title
Resonant torsion magnetometry in anisotropic quantum materials.
- Authors
Modic, K. A.; Bachmann, Maja D.; Ramshaw, B. J.; Arnold, F.; Shirer, K. R.; Estry, Amelia; Betts, J. B.; Ghimire, Nirmal J.; Bauer, E. D.; Schmidt, Marcus; Baenitz, Michael; Svanidze, E.; McDonald, Ross D.; Shekhter, Arkady; Moll, Philip J. W.
- Abstract
Unusual behavior in quantum materials commonly arises from their effective low-dimensional physics, reflecting the underlying anisotropy in the spin and charge degrees of freedom. Here we introduce the magnetotropic coefficient k = ∂2F/∂θ2, the second derivative of the free energy F with respect to the magnetic field orientation θ in the crystal. We show that the magnetotropic coefficient can be quantitatively determined from a shift in the resonant frequency of a commercially available atomic force microscopy cantilever under magnetic field. This detection method enables part per 100 million sensitivity and the ability to measure magnetic anisotropy in nanogram-scale samples, as demonstrated on the Weyl semimetal NbP. Measurement of the magnetotropic coefficient in the spin-liquid candidate RuCl3 highlights its sensitivity to anisotropic phase transitions and allows a quantitative comparison to other thermodynamic coefficients via the Ehrenfest relations. Insights into the behavior of quantum materials are only possible because of the development of suitable experimental probes. Modic et. al. develop the theoretical and experimental basis for resonant torsion magnetometry—a technique to measure anisotropic magnetic responses with high sensitivity.
- Publication
Nature Communications, 2018, Vol 9, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-018-06412-w