Resonant torsion magnetometry in anisotropic quantum materials
- Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
- Cornell Univ., Ithaca, NY (United States). Lab. of Atomic and Solid State Physics
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
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
Web of Science
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 |
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