AI 中文总结
研究通过Mo4PtGa17这种具有几何阻挫呼吸型焦绿石Mo晶格的非中心对称巡游d电子超导体，揭示其类重费米子行为超导性等特性，确定了通过几何阻挫在d电子材料中实现类重费米子超导的途径。
AI 中文摘要
重费米子超导体大多与具有近藤晶格的f电子材料相关，而已知的类d电子重费米子体系常与轨道选择性局域矩、洪德金属物理或电荷密度波机制有关。本文报道了Mo4PtGa17，一种具有几何阻挫呼吸型焦绿石Mo晶格的非中心对称巡游d电子超导体。热力学、输运和核磁共振测量揭示了类重费米子行为的超导性以及在铁磁不稳定性附近增强的铁磁自旋涨落。理论计算确定了费米能附近的近平带、范霍夫奇点和克莱默斯节线，它们本质上源自Mo-4d态且对在位电子关联具有鲁棒性。这些结果表明，Mo4PtGa17中几何阻挫晶格产生了一种有趣的电子结构，增强了态密度、自旋磁化率和准粒子质量。因此，Mo4PtGa17确定了一条通过几何阻挫在d电子材料中实现类重费米子超导的独特途径，还能进一步研究从关联和自旋涨落态中出现的超导性。
英文摘要
Heavy-fermion superconductors are mostly associated with f-electron materials with Kondo lattices, while known d-electron heavy-fermion-like systems are often linked to orbital-selective local moments, Hund-metal physics, or a charge-density-wave mechanism. Here we report Mo4PtGa17, a noncentrosymmetric itinerant d-electron superconductor with a geometrically frustrated breathing-pyrochlore Mo lattice. Thermodynamic, transport and NMR measurements reveal heavy-fermion-like behavior superconductivity and dominant ferromagnetic spin fluctuations near a ferromagnetic instability. Theoretical calculations identify nearly flat bands, van Hove singularities and Kramers nodal lines near the Fermi energy, derived intrinsically from Mo-4d states and are robust against on-site electronic correlations. These results suggest that the geometrically frustrated lattice in Mo4PtGa17 generates an intriguing electronic structure that enhances the density of states, spin susceptibility and quasiparticle mass. Mo4PtGa17 therefore identifies a unique route to heavy-fermion-like superconductivity in d-electron materials through geometrical frustration, different from the previously reported systems.
Comments39 pages, 13 figures, 3 tables
