Superconductivity Study of GaN Highly Doped by Transition Metals |
| J.B. Goska, b, M. Boćkowskic, M. Tokarczyka, G. Kowalskia and A. Twardowskia
aInstitute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland bFaculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland cHigh Pressure Research Centre UNIPRESS, PAS, Sokołowska 29/37, 01-142 Warsaw, Poland |
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| GaN:Cr and GaN:Fe single crystals as well as GaN:Mn micropowders highly doped by transition metals were grown to investigate low temperature superconductivity. Magnetic measurements revealed type I superconductivity with TC ≈ 6 K and HC ≈ 600 Oe, identical for all compounds and also identical to that observed before in GaP:Cr and GaAs:Cr. The presence of amorphous inclusions of gallium may explain existing superconductivity as a result of a phase transition leading to β-Ga during cooling down of the sample. Since the observed parameters are close to those characteristic for superconducting Ga(II) this possibility could not be ruled out. |
DOI: 10.12693/APhysPolA.124.877 PACS numbers: 74.25.Ha, 74.70.-b, 74.25.Dw, 75.50.-y, 61.72.Dd, 81.10.Dn |