Pressure-induced multiband superconductivity in pyrite PtBi2 with perfect electron-hole compensation
Xuliang Chen, Dexi Shao, Chuanchuan Gu, Yonghui Zhou, Chao An, Ying Zhou, Xiangde Zhu, Tong Chen, Mingliang Tian, Jian Sun, Zhaorong Yang
DOI 10.1103/PhysRevMaterials.2.054203 · Physical Review Materials
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Abstract
We report on the discovery of pressure-induced superconductivity in the compensated semimetal pyrite PtBi2, which exhibits extreme magnetoresistance (XMR) and nontrivial band structure at ambient pressure. The appearance of superconductivity, first observed at PC∼13 GPa with an onset critical temperature TC of ∼2.2K, is accompanied by a pronounced enhancement of the density of electrons and holes based on Hall-effect measurements. Upon further compression, TC remains almost unchanged up to 50.0 GPa; remarkably, the perfect electron-hole compensation still holds, while the carrier mobility greatly reduces. No evident trace of structural phase transitions is detected through synchrotron x-ray diffraction over the measured pressure range of 1.5–51.2 GPa. These results highlight a multiband characteristic of the observed superconductivity, making pyrite PtBi2 unique among the compensated XMR materials where the pressure-induced superconductivity usually links to structural transitions and carrier imbalance.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PtBi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | 13 GPa | onset |
| PtBi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | 35.7 GPa | zero_resistance |
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