Probing spin susceptibility of a correlated two-dimensional electron system by transport and magnetization measurements

Abstract

We report temperature and density dependences of the spin susceptibility of strongly interacting electrons in Si inversion layers. We measured (i) the itinerant electron susceptibility ${\chi }^{\ast }$ from the Shubnikov-de Haas oscillations in crossed magnetic fields and (ii) thermodynamic susceptibility ${\chi }_{\mathrm{T}}$ sensitive to all the electrons in the layer. Both ${\chi }^{\ast }$ and ${\chi }_{\mathrm{T}}$ are strongly enhanced with lowering the electron density in the metallic phase. However, there is no sign of divergency of either quantity at the density of the metal-insulator transition $n_c$. Moreover, the value of ${\chi }_{\mathrm{T}}$, which can be measured across the transition down to very low densities deep in the insulating phase, increases with density at $n<n_c$, as expected. In the absence of magnetic field, we found the temperature dependence of ${\chi }^{\ast }$ to be consistent with Fermi-liquid-based predictions, and to be much weaker than the power-law, predicted by non-Fermi-liquid models. We attribute a much stronger temperature dependence of ${\chi }_{\mathrm{T}}$ to localized spin droplets. In strong enough in-plane magnetic field, we found the temperature dependence of ${\chi }^{\ast }$ to be stronger than that expected for the Fermi liquid interaction corrections.

arXiv comment16 pages, 13 figures

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• Observation of an electronic microemulsion phase emerging from a quantum crystal-to-liquid transition
• Metal-insulator transition and low-density phases in a strongly-interacting two-dimensional electron system
• Bloch Ferromagnetism of Composite Fermions
• Interaction-induced metallicity in a two-dimensional disordered non-Fermi liquid
• Evidence for mixed phases and percolation at the metal-insulator transition in two dimensions
• Spin effect on the low-temperature resistivity maximum in a strongly interacting 2D electron system
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• Spin and valley effects on the quantum phase transition in two dimensions
• Magnetic instability and spin-glass order beyond the Anderson-Mott transition in interacting power-law random banded matrix fermions