The Kondo Effect in CexLaLuScY (x = 0.05–1.0) High-Entropy Alloys
Artikel i vetenskaplig tidskrift, 2023

In the search for electronic phenomena in high-entropy alloys (HEAs) that go beyond the independent-electron description, we have synthesized a series of hexagonal rare earth (RE)-based HEAs: CexLaLuScY (x = 0.05–1.0). The measurements of electrical resistivity, magnetic susceptibility and specific heat have shown that the CexLaLuScY HEAs exhibit the Kondo effect, which is of a single impurity type in the entire range of employed Ce concentrations despite the alloys being classified as dense (concentrated) Kondo systems. A comparison to other known dense Kondo systems has revealed that the Kondo effect in the CexLaLuScY HEAs behaves quite differently from the chemically ordered Kondo lattices but quite similar to the RE-containing magnetic metallic glasses and randomly chemically disordered Kondo lattices of the chemical formula RE1xRE21−xM (with RE1 being magnetic and RE2 being nonmagnetic). The main reason for the similarity between HEAs and the metallic glasses and chemically disordered Kondo lattices appears to be the absence of a periodic 4f sublattice in these systems, which prevents the formation of a coherent state between the 4f-scattering sites in the (Formula presented.) 0 limit. The crystal-glass duality of HEAs does not bring conceptually new features to the Kondo effect that would not be already present in other disordered dense Kondo systems. This study broadens the classification of HEAs to correlated electron systems.

high-entropy alloys

structure and microstructure

Kondo effect

Författare

Julia Petrović

Institut Jožef Stefan

S. Vrtnik

Institut Jožef Stefan

A. Jelen

Institut Jožef Stefan

P. Koželj

Univerza V Ljubljani

Institut Jožef Stefan

J. Luzar

Institut Jožef Stefan

Peter Mihor

Institut Jožef Stefan

Q. Hu

Jiangxi Academy of Sciences

Magdalena Wencka

Polish Academy of Sciences

Institut Jožef Stefan

Bojan Ambrožič

Center of Excellence in Nanoscience and Nanotechnology

A. Meden

Univerza V Ljubljani

Goran DraŽić

Kemijski Inštitut

Sheng Guo

Chalmers, Industri- och materialvetenskap, Material och tillverkning

J. Dolinšek

Institut Jožef Stefan

Univerza V Ljubljani

Materials

19961944 (eISSN)

Vol. 16 24 7575

Ämneskategorier

Metallurgi och metalliska material

Den kondenserade materiens fysik

DOI

10.3390/ma16247575

PubMed

38138717

Mer information

Senast uppdaterat

2024-01-08