Superconducting (SC) in equal
molar NbTaTiZr-based high-entropy alloys (HEAs) that were added with Fe, Ge,
Hf, Si, and/or V was observed. According to investigation on crystal structure,
composition, and the relationship between critical temperature and e/a ratio,
as indicated in Matthias’ empirical rule, the main superconducting phase was
that enriched with Nb and Ta. The coherence length (ξ) that was calculated from the carrier density reveals
that ξvalue has the same order of magnitude of several hundreds of
Angstroms as those binary Nb-Ti and Nb-Zr alloys showed.
References
[1]
Onnes, H.K. (1913) Supplements to the Communications of the Physical Laboratory of Leiden University. 34b, 55.
[2]
Meissner, W. and Ochsenfeld, R. (1933) Ein neuer Effekt bei Eintritt der Supraleitfahigkeit. Naturwissenschaften, 21, 787-788. https://doi.org/10.1007/BF01504252
[3]
Dew-Hughes, D. (2001) The Critical Current of Superconductors: An Historical Review. Low Temperature Physics, 27, 713-722. https://doi.org/10.1063/1.1401180
[4]
Narasimhan, S.L., Taggart, R. and Polonis, D.H. (1972) The Superconducting Transition Behavior of ZrNb Binary Alloys. Journal of Nuclear Materials, 43, 258-268. https://doi.org/10.1016/0022-3115(72)90057-8
[5]
Cotton, W.L., Taggart, R. and Polonis, D.H. (1974) The Superconducting Transition Behavior of Ternary Alloys of Titanium. Scripta Metallurgica, 8, 329-336. https://doi.org/10.1016/0036-9748(74)90133-1
[6]
Matthias, B.T. (1957) Chap. 5 Superconductivity in the Periodic System. Progress in Low Temperature Physics, 2, 138-150. https://doi.org/10.1016/S0079-6417(08)60104-3
[7]
Yeh, J.W., Chen, S.K., Lin, S.J., Gan, J.Y., Tsau, T.S. and Chang, S.Y. (2004) Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes. Advanced Engineering. Materials, 6, 299-303. https://doi.org/10.1002/adem.200300567
Tong, C.J., Chen, Y.L., Yeh, J.W., Lin, S.J., Chen, S.K., Shun, T.T., Tsau, C.H. and Chang, S.Y. (2005) Microstructure Characterization of Alx CoCrCuFeNi High-Entropy Alloy System with Multiprincipal Elements. Metallurgical and Materials Transactions A, 36, 881-893. https://doi.org/10.1007/s11661-005-0283-0
[10]
Chen, S.K. and Kao, Y.F. (2012) Near-Constant Resistivity in 4.2-360 K in a B2 Al2.08CoCrFeNi. AIP Advances, 2, 012111-012115. https://doi.org/10.1063/1.3679072
[11]
Kao, Y.F., Chen, S.K., Sheu, J.H., Lin, J.T., Lin, W.E., Yeh, J.W., Lin, S.J., Liou, T.H. and Wang, C.W. (2010) Hydrogen Storage Properties of Multi-Principal-Component CoFeMnTixVyZrz Alloys. International Journal of Hydrogen Energy, 35, 9046-9059.
Bardeen, J., Cooper, L. and Schrieffer, J.R. (1957) Theory of Superconductivity. Physical Review Letters, 108, 1175.
[14]
McMillan, W.L. (1968) Transition Temperature of Strong-Coupled Superconductors. Physical Review B, 167, 331.
[15]
Das Gupta, A., Mordike, B.L. and Schultz, L. (1975) Superconductivity in a Dilute Copper—Niobium Alloy. Materials Science and Engineering, 18, 137-142.
[16]
Kittel, C. (2005) Introduction to Solid State Physics. 8th Edition, Wiley, Hoboken.
[17]
Khan, H.R. (2003) Superconductivity. In: Meyers, R.A., Ed., Encyclopedia of Physical Science and Technology, Elsevier, Amsterdam, 235-250.
[18]
Tsao, T.K. (2012) Nb-Containing Superconducting High-Entropy Alloys. M.S. Thesis, National Tsing Hua University, Hsinchu. (In Chinese)
[19]
Tiwari, G.P. and Ramanujan, R.V. (2001) Review the Relation between the Electron to Atom Ratio and Some Properties of Metallic Systems. Journal of Materials Science, 36, 271-283.
[20]
Mota, A.C. and Hoyt, R.F. (1976) Dependence of the Superconducting Transition Temperature on Electron per Atom Ratio and Lattice Deformation in Noble Metal Alloys. Solid State Communications, 20, 1025-1028.
[21]
Ramakrishnan, S. and Chandra, G. (1985) Study of Superconductivity in Ternary Nb50Ti30M20 (M = Mo, Pt, Pd, V and Ru) Solid Solutions. Solid State Communications, 56, 965-966.
[22]
Bennett, L.H., Watson, R.E. and Carter, G.C. (1970) Relevance of Knight Shift Measurements Electronic Density of States. Journal of Research of the National Bureau of Standards A: Physics and Chemistry, 74, 569-610.
[23]
Cyrot, M. and Pavuna, D. (1992) Introduction to Superconductivity and High-Tc Materials. World Scientific, London.
