A Tunneling Study of Superconducting YBa₂ Cu₃O_y By Contact Junctions At 77 K

Abstract

Giaever tunneling measurements have been applied to investigate the electronic structures of the high Tc superconductor YB2Cu3Oy near Tc. The superconducting energy gap of 17 meV was observed in V-dl/dv curve at 77 K. In the light of BCS model, 2Δ0Δ/kBTc was estimated as 3.3. Several dip structures were observed in the bias region up to 0.5 eV in V-dl/dV curve, using the 3rd derivative analysis. Through the temperature dependence, these structures were found to be associated with the superconductivity.

Tunneling study on electronic band structure of PEO/TaS2 layered nanocomposites

“…The tunnel junction was fabricated using the planar contact technique [20][21][22]. Tunneling measurements were performed using the standard AC modulation technique.…”

A tunnelling study on polymer/1T-LixTaS2layered nanocomposites

“…All tunnelling spectroscopy measurements in this paper were performed at room temperature. The tunnel junction was fabricated using the planar contact technique [29][30][31]. Figure 1 shows a tunnel junction fabrication.…”

“…Tunnelling spectroscopy is a powerful tool for investigating the energy band structures of conductive materials near the Fermi level, because the first-derivative curve of the tunnelling current across the tunnel junction is basically proportional to the density of states (DOS) [25][26][27][28][29][30][31][32][33][34][35]. Recently, we have synthesized layered nanocomposites of 1T-TaS 2 [13][14][15], 2H-TaS 2 [15,16] and 4Hb-TaS 2 [17] by using the exfoliation-adsorption technique.…”