| Автор | Yu G Naidyuk |
| Автор | K Gloos |
| Автор | A A Menovsky |
| Дата выпуска | 1997-07-21 |
| dc.description | Mechanically controllable break junctions of the heavy-fermion superconductor have been investigated. Josephson-like I - V characteristics could be found only for low-ohmic contacts, but without the oscillatory pattern of the critical current in a magnetic field. High-ohmic contacts always had a finite residual resistance as if there was a normal layer at the contact. Some of these contacts showed Andreev-reflection-like features in the differential resistance , while resistive transport usually affected them. We have also realized true vacuum tunnelling: the exponential dependence of the current on the width of the vacuum gap and the transition from tunnelling to metallic contact indicate a nearly free-electron mass of the tunnelling charge carriers, as well as a typical metallic carrier density of . The temperature dependence of the tunnelling current yields direct information about the thermal-expansion coefficient of the samples and its anisotropy. The superconducting features of the I - V characteristic vanish when the contact resistance exceeds about . They could not be resolved by vacuum tunnelling, pointing to a pair-breaking effect of the heavy-fermion interfaces. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Break-junction experiments on single crystals: from bulk transport to vacuum tunnelling |
| Тип | paper |
| DOI | 10.1088/0953-8984/9/29/013 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 9 |
| Первая страница | 6279 |
| Последняя страница | 6291 |
| Выпуск | 29 |
