# Point-contact studies of high-temperature superconductor $\rm YBa_2Cu_3O_{7-\delta}$

## TL;DR

This study investigates point-contacts between high-temperature superconductor YBa2Cu3O7-δ and noble metals, revealing a large energy gap and anisotropic resistivity, contributing to understanding of its superconducting properties.

## Contribution

It presents new measurements of the energy gap and resistivity anisotropy in YBa2Cu3O7-δ using cryochemical prepared point-contacts.

## Key findings

- Energy gap Δ ≈ 40 meV observed
- Ratio 2Δ/kTc ≈ 12 indicates strong coupling
- Anisotropic resistivity along certain crystallographic axes

## Abstract

Point-contacts formed by the high-temperature superconductor $\rm YBa_2Cu_3O_{7-\delta}$ prepared by cryochemical technique, and a noble metal Ag or Cu) are investigated. The maximum value of the energy gap $\Delta\simeq 40~meV$ and the ratio $2\Delta/kT_c\simeq 12$ are obtained. It is found that along certain crystallographic axes of the superconductor under investigation, the electrical resistivity $\lesssim 10^{-5} \Omega\cdot cm$.