Thermal transport and mixed valence in ZrTe${}_3$ doped with Hf and Se

Abstract

Two-dimensional transition metal trichalcogenides (TMTC's) feature covalently bonded metal-chalcogen layers separated by the van der Waals (vdW) gap. Similar to transition metal dichalcogenides (TMDCs), TMTCs often host charge density waves (CDWs) and superconductivity but unlike TMDCs atomic chains in the crystal structure give rise to quasi one-dimensional (quasi 1D) conduction. ZrTe${}_3$ features CDW below $T_{\text{CDW}}$ = 63 K and filamentary superconductivity below 2 K that can be enhanced by pressure or chemical substitution. Here we report the presence of mixed valent Zr${}^{2+}$ and Zr${}^{4+}$ atoms in ZrTe${}_3$ crystals that is reduced by doping in ZrTe${}_{3-x}$Se${}_x$ and Zr${}_{1-y}$Hf${}_y$Te${}_3$. Superconductivity is enhanced via disorder in Te2-Te3 atomic chains that are associated with CDW formation. Hf substitution on Zr atomic site enhances $T_{\text{CDW}}$ due to unperturbed Te2-Te3 chain periodicity and enhanced electron-phonon coupling. Weak electronic correlations in ZrTe${}_{3-x}$Se${}_x$ are likely governed by the lattice contraction effects.

References in corpus (9)

• Classification of Charge Density Waves Based on Their Nature
• On the thermoelectricity of correlated electrons in the zero-temperature limit
• Giant Kohn anomaly and the phase transition in charge density wave ZrTe_3
• Coexistence of superconductivity and charge-density wave in the quasi-one-dimensional material HfTe3
• Coexistence of bulk superconductivity and charge density wave in CuxZrTe3
• Charge density waves and phonon-electron coupling in ZrTe${}_3$ investigated by Raman spectroscopy and first-principles calculations
• Raising Tc in charge density wave superconductor ZrTe3 by Ni intercalation
• Detailed Electronic Structure of the Three-Dimensional Fermi Surface and its Sensitivity to Charge Density Wave Transition in ZrTe3 Revealed by High Resolution Laser-Based Angle-Resolved Photoemission Spectroscopy
• Multiband nodeless superconductivity near the charge-density-wave quantum critical point in ZrTe3-xSex

Cited by in corpus (1)

• Enhanced Superconductivity and Electron Correlations in Intercalated ZrTe${}_3$