Enhanced superconductivity in Hf-base metallic glasses

Details Enhanced superconductivity in Hf-base metallic glasses Enhanced superconductivity in Hf-base metallic glasses

2008-06-03

arxiv.org/abs/0806.0515v2

J. Phys.: Condens. Matter 20 (2008) 425215

Physics

Condensed Matter

Superconductivity

9 pages, 4 figures, 1 table

Scientific paper

10.1088/0953-8984/20/42/425215

Systematic study of electrical resistivity of Hf_{100-x}Fe_x (x=20,25), Hf_{100-x}Cu_x (x=30,40,50), and Ti_{65}Cu_{35} metallic glasses has been done in the temperature range 0.3 K - 290 K, and in magnetic fields B <= 5 T. All Hf-base alloys are superconducting with T_c >= 0.44 K, which is well above T_c of pure crystalline Hf (0.13 K). From the initial slopes of the upper critical fields, (dH_{c2}/dT)_{T_c}, and resistivities we determined the dressed electronic densities of states, N_{\gamma}(E_F), for all alloys. Both T_c and N_{\gamma}(E_F) decrease with increasing x (Fe and Cu content). The results are compared with those for corresponding Zr-base metallic glasses and ion-implanted Hf films.

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