Coplanar microwave resonators made of 330 nm-thick superconducting YBa2Cu3O7 have been realized and characterized in a wide temperature (T, 2–100 K) and magnetic field (B, 0–7 T) range. The quality factor (QL) exceeds 104 below 55K and it slightly decreases for increasing fields, remaining 90% of QL(B=0) for B=7 T and T=2K. These features allow the coherent coupling of resonant photons with a spin ensemble at finite temperature and magnetic field. To demonstrate this, collective strong coupling was achieved by using di(phenyl)-(2,4,6-trinitrophenyl)iminoazanium organic radical placed at the magnetic antinode of the fundamental mode: the in-plane magnetic field is used to tune the spin frequency gap splitting across the single-mode cavity resonance at 7.75 GHz, where clear anticrossings are observed with a splitting as large as 82 MHz at T=2K. The spin-cavity collective coupling rate is shown to scale as the square root of the number of active spins in the ensemble.
Ghirri, A., Bonizzoni, C., Gerace, D., Sanna, S., Cassinese, A., Affronte, M. (2015). YBa2Cu3O7 microwave resonators for strong collective coupling with spin ensembles. APPLIED PHYSICS LETTERS, 106(18), 1-5 [10.1063/1.4920930].
YBa2Cu3O7 microwave resonators for strong collective coupling with spin ensembles
SANNA, SAMUELE;
2015
Abstract
Coplanar microwave resonators made of 330 nm-thick superconducting YBa2Cu3O7 have been realized and characterized in a wide temperature (T, 2–100 K) and magnetic field (B, 0–7 T) range. The quality factor (QL) exceeds 104 below 55K and it slightly decreases for increasing fields, remaining 90% of QL(B=0) for B=7 T and T=2K. These features allow the coherent coupling of resonant photons with a spin ensemble at finite temperature and magnetic field. To demonstrate this, collective strong coupling was achieved by using di(phenyl)-(2,4,6-trinitrophenyl)iminoazanium organic radical placed at the magnetic antinode of the fundamental mode: the in-plane magnetic field is used to tune the spin frequency gap splitting across the single-mode cavity resonance at 7.75 GHz, where clear anticrossings are observed with a splitting as large as 82 MHz at T=2K. The spin-cavity collective coupling rate is shown to scale as the square root of the number of active spins in the ensemble.File | Dimensione | Formato | |
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