Magnetic mixed valent semimetal EuZnSb${}_2$ with Dirac states in the band structure

Abstract

We report discovery of new antiferromagnetic semimetal EuZnSb${}_2$, obtained and studied in the form of single crystals. Electric resistivity, magnetic susceptibility and heat capacity indicate antiferromagnetic order of Eu with $T_N$ = 20 K. The effective moment of Eu${}^{2+}$ inferred from the magnetization and specific heat measurement is 3.5 ${\mu }_B$, smaller than the theoretical value of Eu${}^{2+}$ due to presence of both Eu${}^{3+}$ and Eu${}^{2+}$. Magnetic field-dependent resistivity measurements suggest dominant quasi two dimensional Fermi surfaces whereas the first-principle calculations point to the presence of Dirac fermions. Therefore, EuZnSb${}_2$ could represent the first platform to study the interplay of dynamical charge fluctuations, localized magnetic 4$f$ moments and Dirac states with Sb orbital character.

arXiv comment9 pages, 4 figures

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• Antiferro- and Meta-magnetism in the S=7/2 Hollandite Analog EuGa2Sb2
• Topological Antiferromagnetic Semimetal for Spintronics: A Case Study of a Layered Square Net System EuZnSb${}_2$
• Molecular beam deposition of a new layered pnictide with distorted Sb square nets
• Synthesis of europium-based crystals containing As or P by a flux method: attempts to grow EuAgP single crystals
• Einstein and Debye temperatures, electron-phonon coupling constant and a probable mechanism for ambient-pressure room-temperature superconductivity in intercalated graphite
• Magnetic structure of EuZn${}_2$Sb${}_2$ single-crystal thin-film