Point-Contact Spectroscopy of Superconducting MgCNi3 Single Crystals |
| Z. Pribulová a, P. Szabó a, J. Kačmarčík a, P. Samuely a, D.-J. Jang b, H.G. Lee b, H.S. Lee b and S.-I. Lee b
a Centre of Low Temperature Physics (CLTP) IEP SAS & FS UPJŠ, Watsonova 47, 040 01 Košice, Slovakia b NCRICS and Department of Physics, Pohang University of Science and, Technology, Pohang 790-784, Republic of Korea |
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| Received: 9 07 2007; |
| The first point-contact spectroscopy measurements on MgCNi3 single crystals of very good quality are presented. The measurements have been performed in the temperature range from 1.5 K up to 10 K and at magnetic fields up to 6 T. The superconducting energy gap Δ of the system is found to be scattered between 1 and 1.2 meV which gives the 2Δ/kTc ratio between BCS weak-coupling value of ~3.5 and a strong coupling of about 4.2. The excess current evaluated in magnetic field indicates the presence of a single energy gap. |
| DOI: 10.12693/APhysPolA.113.215 PACS numbers: 74.50+r |