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Chemical Route to Yb 14 MgSb 11 Composites with Nanosized Iron Inclusions for the Reduction of Thermal Conductivity

https://doi.org/10.1021/acsaem.1c00163

Perez, Christopher J. ; Chen, Zhijie ; Beeson, Willie B. ; Chanakian, Sevan ; Liu, Kai ; Bux, Sabah K. ; Kauzlarich, Susan M. ( April 2021 , ACS Applied Energy Materials)
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CoTe 2 : A Quantum Critical Dirac Metal with Strong Spin Fluctuations

https://doi.org/10.1002/adma.202300640

Siegfried, Peter E. ; Bhandari, Hari ; Qi, Jeanie ; Ghimire, Rojila ; Joshi, Jayadeep ; Messegee, Zachary T. ; Beeson, Willie B. ; Liu, Kai ; Ghimire, Madhav Prasad ; Dang, Yanliu ; et al ( April 2023 , Advanced Materials)

Abstract
Quantum critical points separating weak ferromagnetic and paramagnetic phases trigger many novel phenomena. Dynamical spin fluctuations not only suppress the long‐range order, but can also lead to unusual transport and even superconductivity. Combining quantum criticality with topological electronic properties presents a rare and unique opportunity. Here, by means of ab initio calculations and magnetic, thermal, and transport measurements, it is shown that the orthorhombic CoTe₂is close to ferromagnetism, which appears suppressed by spin fluctuations. Calculations and transport measurements reveal nodal Dirac lines, making it a rare combination of proximity to quantum criticality and Dirac topology.

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