Abstract
The sharp edge of the phonon "bremsstrahlung" spectrum of a superconducting tunnel junction was isolated by modulation. This yielded a monochromatic, voltage-tunable phonon source which was applied for phonon spectroscopy on V3+ ions in Al2O3. At a frequency corresponding to the ground-state splitting of V3+ an absorption dip was obtained due to resonant scattering. A frequency resolution of about 3% of the energy gap was achieved.
| Original language | English |
|---|---|
| Pages (from-to) | 1564-1567 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 28 |
| Issue number | 24 |
| DOIs | |
| State | Published - 1972 |
| Externally published | Yes |