Fermi surface mapping of the kagome superconductor RbV3Sb5 using de Haas-van Alphen oscillations
Keshav Shrestha, Mengzhu Shi, Thinh Nguyen, Duncan Miertschin, Kaibao Fan, Liangzi Deng, David E. Graf, Xianhui Chen, Ching-Wu Chu
DOI 10.1103/PhysRevB.107.075120 · Physical Review B
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Abstract
We present the results from torque magnetometry studies of the kagome superconductor RbV3Sb5 under applied fields up to 45 T and temperatures down to liquid He3 temperature (0.32 K). The torque signal shows clear de Haas–van Alphen (dHvA) oscillations with eight distinct frequencies ranging from ≈150 to 3000 T. Among these, five are above 500 T. Angle-dependent measurement of dHvA oscillations shows that all frequencies follow 1/cosθ dependence, where θ is the tilt angle with respect to the applied field direction, and the oscillations disappear above θ = 60∘, which confirms that the Fermi surfaces corresponding to these frequencies are two dimensional. The Berry phase (ϕ), calculated by constructing a Landau level fan diagram, is found to be ≈π, which strongly supports the nontrivial topology of RbV3Sb5. Using the Lifshitz-Kosevich formula, we estimate the effective mass (m*) of charge carriers in RbV3Sb5, and it is found to be heavier (≈0.7mo, where mo is the free electron mass) than that for other topological insulators. The findings of high frequencies up to 3000 T in RbV3Sb5 have not been reported previously, and the results regarding the Fermi surface of RbV3Sb5 are crucial for understanding the charge density wave order, superconductivity, and nontrivial topology in AV3Sb5 (A = K, Rb, and Cs), as well as the interplay among them.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| RbV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure not reported | onset |
| KV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure not reported | onset |
| CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | onset |
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