Layered semiconductor EuTe 4 with charge density wave order in square tellurium sheets

Abstract

We report a novel quasi-two dimensional compound of EuTe4 hosting charge density waves (CDW) instability. The compound has a crystallographic structure in a orthorhombic space group Pmmn (No.59) with cell parameters a = 4.6347(2)Å, b = 4.5119(2)Å, c = 15.6747(10)Å at room temperature. The pristine structure contains consecutive near-square Te sheets separated by corrugated Eu-Te slabs. Upon cooling, the compound experiences a phase transition near 255 K. X-ray crystallographic analysis and transmission electron microscopy (TEM) measurements reveal strong structural distortions in the low temperature phase, showing a superstructure with a periodic formation of Te-trimers in the monolayer Te sheets, yielding evidence for the formation of CDW order. The charge transport properties show a semiconducting behavior in the CDW state. Density functional theory calculations reveals a Fermi surface nesting driven instability with a nesting vector in good agreement with the one observed experimentally. Our finding provides a promising system for the study of CDW driven 2D semiconducting mechanisms, which would shed a new light on exploring novel 2D semiconductors with collective electronic states.

arXiv comment8 pages,4 figs

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Cited by in corpus (14)

• Large negative magnetoresistance in the new antiferromagnetic rare-earth dichalcogenide EuTe${}_2$
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• Angle-resolved photoemission spectroscopy study of the charge density wave order in layered semiconductor EuTe4
• Thermal hysteretic behavior and negative magnetoresistance in an unusual charge-density-wave material EuTe4
• Room-temperature non-volatile optical manipulation of polar order in a charge density wave
• Coexistence of interacting charge density waves in a layered semiconductor
• Interplay between electron band-anticrossing and charge-density-wave instabilities
• Large moiré superstructure of stacked incommensurate charge density waves
• Umklapp-driven first-order transition into a charge-density wave phase
• Bidirectional ultrafast control of charge density waves via phase competition
• Enhanced thermopower in a magnetic semiconductor EuTe4 with multiple charge-density-wave instabilities/
• Observation of momentum dependent charge density wave gap in EuTe4
• Multifold enhancement in magnetization of atomically thin Cobalt Telluride