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  Resonant torsion magnetometry in anisotropic quantum materials

Modic, K. A., Bachmann, M. D., Ramshaw, B. J., Arnold, F., Shirer, K. R., Estry, A., et al. (2018). Resonant torsion magnetometry in anisotropic quantum materials. Nature Communications, 9: 3975. doi:10.1038/s41467-018-06412-w.

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https://doi.org/10.1038/s41467-018-06412-w (Publisher version)
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 Creators:
Modic, K. A.1, Author
Bachmann, Maja D.1, Author
Ramshaw, B. J.1, Author
Arnold, F.1, Author
Shirer, K. R.1, Author
Estry, Amelia1, Author
Betts, J. B.1, Author
Ghimire, Nirmal J.1, Author
Bauer, E. D.1, Author
Schmidt, Marcus1, Author
Baenitz, Michael1, Author
Svanidze, E.1, Author
McDonald, Ross D.1, Author
Shekhter, Arkady1, Author
Moll, Philip J. W.1, Author
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1external, ou_persistent22              

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 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.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41467-018-06412-w
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 9 Sequence Number: 3975 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723