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Petrović J, Vrtnik S, Jelen A, Koželj P, Luzar J, Mihor P, Hu Q, Wencka M, Ambrožič B, Meden A, Dražić G, Guo S, Dolinšek J. The Kondo Effect in Ce xLaLuScY ( x = 0.05-1.0) High-Entropy Alloys. MATERIALS (BASEL, SWITZERLAND) 2023; 16:7575. [PMID: 38138717 PMCID: PMC10744949 DOI: 10.3390/ma16247575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 12/04/2023] [Accepted: 12/06/2023] [Indexed: 12/24/2023]
Abstract
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 T→ 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.
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Affiliation(s)
- Julia Petrović
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | | | - Andreja Jelen
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Primož Koželj
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia
| | - Jože Luzar
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Peter Mihor
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Qiang Hu
- Institute of Applied Physics, Jiangxi Academy of Sciences, Changdong Road 7777, Nanchang 330096, China
| | - Magdalena Wencka
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
- Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland
| | - Bojan Ambrožič
- Center of Excellence in Nanoscience and Nanotechnology, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Anton Meden
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Goran Dražić
- Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
| | - Sheng Guo
- Industrial and Materials Science, Chalmers University of Technology, 41296 Göteborg, Sweden
| | - Janez Dolinšek
- Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia
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