AI Article Synopsis
- The kagome spin ice can exhibit frustrated magnetic excitations when local spins are flipped, which can be studied using scanning tunneling microscopy (STM).
- Applying this technique to the kagome metal HoAgGe, distinct dips in the local tunneling spectrum indicate a strong correlation with the spin ice's magnetic properties, disappearing above the spin ice formation temperature.
- A two-level spin-flip model is proposed to explain these tunneling dips, highlighting the role of spin-orbit coupling in the emergent excitations of spin ice magnetism in this material.
Article Abstract
The kagome spin ice can host frustrated magnetic excitations by flipping its local spin. Under an inelastic tunneling condition, the tip in a scanning tunneling microscope can flip the local spin, and we apply this technique to kagome metal HoAgGe with a long-range ordered spin ice ground state. Away from defects, we discover a pair of pronounced dips in the local tunneling spectrum at symmetrical bias voltages with negative intensity values, serving as a striking inelastic tunneling signal. This signal disappears above the spin ice formation temperature and has a dependence on the magnetic fields, demonstrating its intimate relation with the spin ice magnetism. We provide a two-level spin-flip model to explain the tunneling dips considering the spin ice magnetism under spin-orbit coupling. Our results uncover a local emergent excitation of spin ice magnetism in a kagome metal, suggesting that local electrical field induced spin flip climbs over a barrier caused by spin-orbital locking.
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| http://dx.doi.org/10.1103/PhysRevLett.133.046503 | DOI Listing |
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