Resonant torsion magnetometry in anisotropic quantum materials

K. A. Modic (), Maja D. Bachmann, B. J. Ramshaw, F. Arnold, K. R. Shirer, Amelia Estry, J. B. Betts, Nirmal J. Ghimire, E. D. Bauer, Marcus Schmidt, Michael Baenitz, E. Svanidze, Ross D. McDonald, Arkady Shekhter and Philip J. W. Moll ()
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K. A. Modic: Max-Planck-Institute for Chemical Physics of Solids
Maja D. Bachmann: Max-Planck-Institute for Chemical Physics of Solids
B. J. Ramshaw: Cornell University
F. Arnold: Max-Planck-Institute for Chemical Physics of Solids
K. R. Shirer: Max-Planck-Institute for Chemical Physics of Solids
Amelia Estry: Max-Planck-Institute for Chemical Physics of Solids
J. B. Betts: Los Alamos National Laboratory
Nirmal J. Ghimire: Los Alamos National Laboratory
E. D. Bauer: Los Alamos National Laboratory
Marcus Schmidt: Max-Planck-Institute for Chemical Physics of Solids
Michael Baenitz: Max-Planck-Institute for Chemical Physics of Solids
E. Svanidze: Max-Planck-Institute for Chemical Physics of Solids
Ross D. McDonald: Los Alamos National Laboratory
Arkady Shekhter: Florida State University
Philip J. W. Moll: Max-Planck-Institute for Chemical Physics of Solids

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-06412-w

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