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Wencka M, Krnel M, Jelen A, Vrtnik S, Luzar J, Koželj P, Gačnik D, Meden A, Hu Q, Wang C, Guo S, Dolinšek J. Electronic transport properties of the Al 0.5TiZrPdCuNi alloy in the high-entropy alloy and metallic glass forms. Sci Rep 2022; 12:2271. [PMID: 35145144 PMCID: PMC8831620 DOI: 10.1038/s41598-022-06133-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 01/25/2022] [Indexed: 11/22/2022] Open
Abstract
High-entropy alloys (HEAs) are characterized by a simultaneous presence of a crystal lattice and an amorphous-type chemical (substitutional) disorder. In order to unravel the effect of crystal-glass duality on the electronic transport properties of HEAs, we performed a comparative study of the electronic transport coefficients of a 6-component alloy Al0.5TiZrPdCuNi that can be prepared either as a HEA or as a metallic glass (MG) at the same chemical composition. The HEA and the MG states of the Al0.5TiZrPdCuNi alloy both show large, negative-temperature-coefficient resistivity, positive thermopower, positive Hall coefficient and small thermal conductivity. The transport coefficients were reproduced analytically by the spectral conductivity model, using the Kubo-Greenwood formalism. For both modifications of the material (HEA and MG), contribution of phonons to the transport coefficients was found small, so that their temperature dependence originates predominantly from the temperature dependence of the Fermi–Dirac function and the variation of the spectral conductivity and the related electronic density of states with energy within the Fermi-level region. The very similar electronic transport coefficients of the HEA and the MG states point towards essential role of the immense chemical disorder.
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Affiliation(s)
- Magdalena Wencka
- Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia.,Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60179, Poznan, Poland
| | - Mitja Krnel
- Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
| | - Andreja Jelen
- Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
| | | | - Jože Luzar
- Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
| | - Primož Koželj
- Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia.,University of Ljubljana, Faculty of Mathematics and Physics, Jadranska 19, 1000, Ljubljana, Slovenia
| | - Darja Gačnik
- Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
| | - Anton Meden
- University of Ljubljana, Faculty of Chemistry and Chemical Technology, Večna pot 113, 1000, Ljubljana, Slovenia
| | - Qiang Hu
- Institute of Applied Physics, Jiangxi Academy of Sciences, Changdong Road 7777, Nanchang, 330096, People's Republic of China.
| | - Chaomin Wang
- Institute of Applied Physics, Jiangxi Academy of Sciences, Changdong Road 7777, Nanchang, 330096, People's Republic of China
| | - Sheng Guo
- Industrial and Materials Science, Chalmers University of Technology, 41296, Göteborg, Sweden
| | - Janez Dolinšek
- Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia. .,University of Ljubljana, Faculty of Mathematics and Physics, Jadranska 19, 1000, Ljubljana, Slovenia.
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Namarvar OF, Mayou D. Theory for STM images of resonances in the near-field regime: application to adsorbates and local defects on graphene. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:245502. [PMID: 26037044 DOI: 10.1088/0953-8984/27/24/245502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We analyze the STM current through electronic resonances on a substrate as a function of tip-surface distance. We show that when the tip approaches the surface a maximum of the density of states of the electronic resonance at some energy can lead to a dip of the STM signal dI/dV. This phenomenon is a Fano effect resulting from the coupling of the electronic states of the STM tip with the resonance. In graphene such resonances can be produced by local defects or adsorbates and we analyze the cases of top and hollow configurations of adsorbates.
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Affiliation(s)
- Omid Faizy Namarvar
- Institut Néel, CNRS: Université Joseph Fourier, F-38042 Grenoble, France. CEMES-CNRS, Pico-Lab, 29 rue Jeanne Marvig, F-31055 Toulouse, France
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Fukunaga T, Sugiura H, Takeichi N, Mizutani U. Experimental studies of atomic structure, electronic structure, and the electronic transport mechanism in amorphous Al-Cu-Y and Mg-Cu-Y ternary alloys. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:3200-3210. [PMID: 9986219 DOI: 10.1103/physrevb.54.3200] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Rhie K, Naugle DG, O B, Markert JT. Sign change of Hall coefficients for amorphous Ni0.80-xCrxP0.20 alloys. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:12688-12694. [PMID: 10010172 DOI: 10.1103/physrevb.49.12688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Lindqvist P, Berger C, Klein T, Lanco P, Cyrot-Lackmann F, Calvayrac Y. Role of Fe and sign reversal of the Hall coefficient in quasicrystalline Al-Cu-Fe. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:630-633. [PMID: 10006827 DOI: 10.1103/physrevb.48.630] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Schulte A, Haensch W, Fritsch G, Lüscher E. Disorder and density-of-states effects on the Hall constant in amorphous transition-metal alloys. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:3581-3591. [PMID: 9992325 DOI: 10.1103/physrevb.40.3581] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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