کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1818078 | 1525728 | 2013 | 4 صفحه PDF | دانلود رایگان |
Tunneling measurements of the electron spectrum in the superconducting state have been carried out in Y2C3 samples with the bulk (resistive and diamagnetic) critical temperature Tc = 15–16 K. A break-junction technique was crucial to find the intrinsic gap features. The representative gap structure at 4 K reveals distinct BCS-like peaks with the gap value of 2Δ(4 K) = 3–4 meV. Assuming local Tc values of 10–13 K, the characteristic gap to Tc ratio 2Δ/kBTc (kB is the Boltzmann constant) was found to possess the BCS weak-coupling value 3.5 ± 0.2, appropriate to isotropic s-wave superconductors.
► The first electron tunneling measurements of the superconductor Y2 C3 are carried out.
► The break-junction tunneling is crucial to find the gap of the unstable Y2C3.
► The simple BCS gap structure in Y2C3 is confirmed by the break-junction method.
► There is no evidence of the multiple-gap superconductivity in Y2C3.
Journal: Physica C: Superconductivity - Volume 484, 15 January 2013, Pages 52–55