CeTe3

CeTe3
Name	CeTe3
Category	Rare-earth telluride
Formula	CeTe3
Molweight	449.88 g·mol−1
Crystal system	Orthorhombic (distorted)
Symmetry	Cmcm (or related)
Color	Metallic gray
Habit	Plate-like, laminated
Cleavage	Perfect along layers
Density	~7–8 g·cm−3
Other	Layered van der Waals material

CeTe3 CeTe3 is a layered rare‑earth telluride belonging to the family of RTe3 (R = rare earth) compounds studied within condensed matter physics, materials science, and solid‑state chemistry. It is notable for its anisotropic crystal structure, strong electron–phonon coupling, and propensity to form charge density waves observed in experiments by groups working on low‑dimensional conductors and correlation phenomena. Researchers in institutions studying quantum materials, synchrotron spectroscopy, and high‑pressure techniques investigate CeTe3 alongside other rare‑earth tritellurides to explore tunable electronic instabilities and potential device concepts.

Introduction

CeTe3 is one member of the rare‑earth tritelluride series synthesized and characterized by laboratories affiliated with national laboratories, universities, and synchrotron facilities. Studies often reference techniques and organizations such as European Synchrotron Radiation Facility, Advanced Photon Source, Lawrence Berkeley National Laboratory, Brookhaven National Laboratory, and research groups centered at Massachusetts Institute of Technology, Stanford University, Max Planck Institute for Solid State Research, University of California, Berkeley, and University of Geneva. Experimental investigations link CeTe3 to phenomena explored in works on Peierls instability, Fermi surface nesting, angle‑resolved photoemission spectroscopy, and scanning tunneling microscopy.

Crystal structure

The crystal structure of CeTe3 adopts an orthorhombic, layered arrangement closely related to the parent family first detailed by teams working at CNRS, Oak Ridge National Laboratory, and NIST. Te atoms form planar square nets separated by corrugated slabs containing Ce, producing a quasi‑two‑dimensional motif analogous to structures examined in studies of transition metal dichalcogenides, graphite, black phosphorus, and layered oxides investigated at Max Planck Institute for Chemical Physics of Solids. Lattice parameters and space group assignments are typically reported following refinements performed with data from instruments at Argonne National Laboratory, European Synchrotron Radiation Facility, and university X‑ray crystallography facilities. The van der Waals gap between Te layers enables exfoliation reminiscent of efforts on 2D materials pursued at University of Manchester and National Institute for Materials Science.

Physical properties

Measured transport, optical, and magnetic properties of CeTe3 have been reported by collaborations involving Los Alamos National Laboratory, Columbia University, University of British Columbia, and University of Tokyo. Electrical resistivity displays strong anisotropy between in‑plane and out‑of‑plane directions, with temperature dependence influenced by collective modes studied in contexts like charge density wave research and experiments at Paul Scherrer Institute. Optical conductivity and reflectivity measurements, carried out at facilities such as SOLEIL and ELSA, reveal gap features consistent with density wave formation similar to observations in NbSe2, TaS2, and rare‑earth dichalcogenides measured by researchers at Rutgers University. Magnetic susceptibility and specific heat measurements connect Ce valence behavior to crystal‑field effects explored in spectroscopy programs at Institut Laue‑Langevin and universities studying rare‑earth magnetism.

Electronic structure and charge density waves

The electronic structure of CeTe3 has been mapped using angle‑resolved photoemission spectroscopy (ARPES) at beamlines operated by Advanced Light Source, Swiss Light Source, Diamond Light Source, and BESSY II, showing quasi‑1D Fermi surface sheets susceptible to nesting. The nesting drives an incommensurate charge density wave (CDW) whose wavevector, amplitude, and temperature dependence have been characterized in works by groups at UC San Diego, University of Geneva, Princeton University, and ENS Paris. The interplay of Ce 4f states, Te 5p bands, and electron–phonon coupling is analyzed with density functional theory calculations performed by teams using codes developed by communities around Oak Ridge National Laboratory and Argonne National Laboratory. Studies compare CeTe3 CDW behavior to classic cases like K0.3MoO3, Blue bronze, and layered compounds examined in reviews from Reviews of Modern Physics and specialty conferences.

Synthesis and growth

CeTe3 crystals are grown by techniques developed in solid‑state chemistry groups at ETH Zurich, Cornell University, University of California, Santa Barbara, and University of Illinois at Urbana‑Champaign, including self‑flux methods, chemical vapor transport, and Bridgman growth inspired by methods used for rare‑earth pnictides and transition metal oxides. Purity controls and annealing protocols reference standards from materials facilities at Argonne National Laboratory and Los Alamos National Laboratory. Single crystals suitable for ARPES and transport studies are typically prepared using Te flux with procedures optimized by collaborations between university laboratories and national synchrotron centers.

Chemical properties and reactivity

Chemically, CeTe3 exhibits stability typical of rare‑earth tellurides under inert atmospheres used in gloveboxes at institutions like Sandia National Laboratories and IMDEA Materials Institute, but it is sensitive to oxidation and moisture similar to other tellurides studied at University of Copenhagen and University of Helsinki. Reactivity studies reference handling practices from inorganic synthesis groups at University of Oxford and Yale University; exposure to oxygen alters surface electronic states probed in surface science campaigns at Lawrence Livermore National Laboratory and Argonne National Laboratory. Intercalation and substitution chemistry, pursued by groups at University of Munich and Tohoku University, investigate tuning of CDW properties via chemical pressure or carrier concentration modifications.

Applications and research directions

While CeTe3 is primarily a platform for fundamental research pursued by communities at APS, ESRF, SLAC National Accelerator Laboratory, and major universities, proposed directions include exploiting CDW dynamics for ultrafast electronics studied at Fritz Haber Institute, exploring low‑dimensional correlated behavior relevant to proposals from Center for Emergent Superconductivity, and integrating layered crystals into heterostructures akin to efforts at MIT.nano and Harvard University. Ongoing research focuses on pressure‑ and doping‑induced phase diagrams mapped by collaborations involving Max Planck Institute for the Physics of Complex Systems, University of Cambridge, and national laboratories, with potential cross‑links to studies of unconventional superconductivity in other rare‑earth families reported in high‑profile journals and conferences.

Category:Rare earth compounds Category:Tellurides Category:Layered materials