Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4920930
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Funding
- Italian Ministry of Education and Research (MIUR) through Fondo Investimenti per la Ricerca di Base (FIRB) Project [RBFR12RPD1]
- U.S. AFOSR/AOARD program [FA2386-13-1-4029]
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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 (Q(L)) exceeds 10(4) below 55 K and it slightly decreases for increasing fields, remaining 90% of Q(L) (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 similar to 82 MHz at T = 2 K. The spin-cavity collective coupling rate is shown to scale as the square root of the number of active spins in the ensemble. (c) 2015 AIP Publishing LLC.
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