English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Thermoelectricity and electronic properties of Y1-xCexCrB4

Flipo, S., Rosner, H., Bobnar, M., Kvashnina, K. O., Leithe-Jasper, A., & Gumeniuk, R. (2021). Thermoelectricity and electronic properties of Y1-xCexCrB4. Physical Review B, 103(19): 195121, pp. 1-11. doi:10.1103/PhysRevB.103.195121.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Flipo, Sever1, Author              
Rosner, Helge2, Author              
Bobnar, Matej1, Author              
Kvashnina, Kristina O.3, Author
Leithe-Jasper, Andreas4, Author              
Gumeniuk, Roman5, Author              
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3External Organizations, ou_persistent22              
4Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863406              
5Roman Gumeniuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863421              

Content

show
hide
Free keywords: Boron compounds, Cerium, Cerium compounds, Chemical stability, Chromium compounds, Electronic properties, Electronic structure, High temperature applications, Magnetic susceptibility, Magnetism, Thermal conductivity, Thermoelectricity, X ray absorption spectroscopy, Electrical resistivity datum, Electronic structure calculations, High-temperature thermoelectric applications, Magnetic susceptibility measurements, Thermal transport properties, Thermoelectric performance, Thermoelectric properties, Wavelength dispersive spectrometries, Yttrium compounds
 Abstract: Boron-rich materials combine chemical stability with refractory properties and, consequently, are interesting for high-temperature thermoelectric applications. Therefore, the magnetic, electrical, and thermal transport properties of the Y1-xCexCrB4 series have been investigated here to employ the concept of correlation-enhanced thermoelectric properties. Combining X-ray diffraction and energy-or wavelength-dispersive spectrometry, we find a rather narrow stability range of Y1-xCexCrB4, only samples on the Y- A nd Ce-rich substitution limits (x=0,0.05,0.95,and1) were obtained. Electrical resistivity data show a change from semiconducting (x=0) to metallic behavior upon Ce substitution (x≥0.95). From magnetic susceptibility measurements and X-ray absorption spectroscopy, we find a temperature-dependent intermediate valence state of Ce of about +3.5. However, a fit of the magnetic susceptibility data to the Coqblin-Schrieffer model yields a surprisingly high Kondo temperature of about 1100 K. Together with the good thermal conductivity for the studied substitution series this impedes a suitable thermoelectric performance. Electronic structure calculations for YCrB4 support its narrow gap semiconducting nature in contrast to previous studies. Surprisingly, its electronic structure is characterized by pronounced van Hove singularities very close to the Fermi-level EF. They originate from nearly dispersionless Cr 3dz2-r2-derived bands in a large part of the Brillouin zone, suggesting the appearance of electronic instabilities upon rather small electron doping into these states. © 2021 American Physical Society.

Details

show
hide
Language(s): eng - English
 Dates: 2021-05-112021-05-11
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.103.195121
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 103 (19) Sequence Number: 195121 Start / End Page: 1 - 11 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008