Pressure-induced superconductivity in the topological crystalline insulator NaCd4As3
Haiyang Yang, Yonghui Zhou, Jing Wang, Shuyang Wang, Chao An, Ying Zhou, Xuliang Chen, Lili Zhang, Xiaoping Yang, Zhaorong Yang
DOI 10.1103/PhysRevB.110.L060509 · Physical Review B
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Abstract
Recently, a united symmetry-protected topological crystalline insulator (TCI) NaCd4As3 has been discovered experimentally, which further features a temperature-driven transformation from TCI to TI due to the mirror symmetry broken across a rhombohedral-to-monoclinic structural transition. Here, we report the pressure tuning of structural property and emergence of superconductivity in TCI NaCd4As3 by comprehensive high-pressure experiments in diamond-anvil cell. Temperature-dependent Raman measurements show that the structural transition temperature gradually reduces upon compression and is completely suppressed above ∼4 GPa. The stable rhombohedral phase further undergoes amorphization evidenced by synchrotron x-ray-diffraction result, which sets in at 20.7 GPa and completes at 34.4 GPa. Along with the complete amorphization, the metallization and superconductivity with a critical temperature Tc∼2.5 K appear simultaneously, as observed in transport experiments. We argue that the sudden enhancement in Tc across 60.0 GPa is likely related to the pressure-driven amorphous polymorphism. Our finding unravels the fundamental structure-property relationship and highly tunable crystallographic symmetry in NaCd4As3 by external pressure, potentially sparking further investigations via alternative tuning strategies.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaCd4As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | 33.5 GPa | onset |
| NaCd4As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | 39.1 GPa | onset |
| NaCd4As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | 60 GPa | onset |
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