CoTe2: A quantum critical Dirac metal with strong spin fluctuations

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...

Full description

Saved in:
Bibliographic Details
Main Authors Siegfried, Peter E, Bhandari, Hari, Qi, Jeanie, Ghimire, Rojila, Joshi, Jayadeep, Messegee, Zachary T, Beeson, Willie, Liu, Kai, Ghimire, Madhav Prasad, Dang, Yanliu, Zhang, Huairuo, Davydov, Albert, Tan, Xiaoyan, Vora, Patrick M, Mazin, Igor I, Ghimire, Nirmal J
Format Journal Article
LanguageEnglish
Published 28.08.2022
Subjects
Physics - Strongly Correlated Electrons
Online AccessGet full text

Cover

More Information
Summary: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, we show that the orthorhombic CoTe$_2$ is 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.
DOI:10.48550/arxiv.2208.13334