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Bi
Park, P.*; Ortiz, B. R.*; Spargue, M.*; Sakuya, A. P.*; Chen, S. A.*; Frontzek, M. D.*; Tian, W.*; Sibille, R.*; Mazzone, D. G.*; 田端 千紘; et al.
Nature Communications (Internet), 16, p.4384_1 - 4384_9, 2025/05
被引用回数：17 パーセンタイル：97.29(Multidisciplinary Sciences)Kagome metals with van Hove singularities (VHSs) near the Fermi level can host intriguing quantum phenomena, including chiral loop currents, electronic nematicity, and unconventional superconductivity. However, unconventional magnetic states driven by VHSs, such as spin-density waves (SDWs), have yet to be observed experimentally in kagome metals. Here, we present a comprehensive investigation of the magnetic and electronic structure of the layered kagome metal CeTiBi, where the Ti kagome electronic structure interacts with a magnetic sublattice of Ce
= 1/2 moments. Our findings establish the rare-earth Kagome metals LnTi3Bi4 as a model platform where characteristic electronic structure of the kagome lattice plays a pivotal role in magnetic order.
Mg; Bridging the 
and 
islands of inversionMadurga, M.*; Christie, J. M.*; Xu, Z.*; Grzywacz, R.*; Poves, A.*; King, T.*; Allmond, J. M.*; Chester, A.*; Cox, I.*; Farr, J.*; et al.
Physical Review C, 109(6), p.L061301_1 - L061301_6, 2024/06
被引用回数：4 パーセンタイル：55.75(Physics, Nuclear)ミシガン州立大学の国立超伝導サイクロトロン研究所にて
Caからのフラグメンテーション反応によって中性子過剰核Mgを生成、分離し、そのアイソマーを探した。その結果、168keVのガンマ線を出して
に半減期約90nsで脱励起するアイソマーを発見した。その性質を議論するため、大規模殻模型計算の結果と比較した。Mg同位体では中性子数20から28領域にかけて広く変形核となることが知られているが、理論的には、前者の領域は
殻から2個の中性子が励起することによって変形し、後者の領域は中性子数28の殻ギャップからの中性子励起によって変形する。Mgはその中間に位置し、両者の状態が近くに存在することで、励起エネルギーの低い
が出現すると理解される。
BiPark, P.*; Ortiz, B. R.*; Spargue, M.*; Sakuya, A. P.*; Chen, S. A.*; Frontzek, M. D.*; Tian, W.*; Sibille, R.*; Mazzone, D. G.*; 田端 千紘; et al.
no journal, ,
The electronic band structure of kagome metals is the basis for a growing number of intriguing physical phenomena. Here we focus on the case of Ce pseudospin-1/2 local moments coupled by a Ti-derived Kagome electronic structure in the material CeTiBi. Neutron scattering measurements under applied magnetic fields reveal that CeTiBi exhibits a rich temperature-field phase diagram where an incommensurate spin-density wave (SDW) ground state coexists with a commensurate magnetic modulation. Remarkably, ARPES and DFT investigations reveal that the van Hove singularities (VHSs) of the kagome bands near the Fermi level are nested by vectors which coincide with the observed magnetic propagation vectors. This correspondence suggests a VHS-driven mechanism for SDW formation and provides an interesting counterpart to the charge density waves observed in other kagome metals. Our results establish that CeTiBi offers a rare opportunity to explore intertwined kagome Fermiology and quantum-magnetic spin textures.
