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Title: Resonant torsion magnetometry in anisotropic quantum materials

Journal Article · · Nature Communications

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); LANL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); Engineering and Physical Sciences Research Council (EPSRC); Max Planck Society (Germany)
Grant/Contract Number:
AC52-06NA25396; DMR-1157490; DMR-1644779; EP/I007002/1
OSTI ID:
1477705
Report Number(s):
LA-UR-18-28424
Journal Information:
Nature Communications, Vol. 9; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (2)

Chiral spin order in some purported Kitaev spin-liquid compounds journal November 2018
Sawtooth Torque in Anisotropic j eff = 1 / 2 Magnets: Application to α − RuCl 3 journal May 2019

Figures / Tables (8)


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