Superconducting Plasma Excitation at Microwave Frequencies in Parallel Magnetic Fields in $\mathrm{\mathbf{Bi_2Sr_2CaCu_2O_{8+δ}}}$

Details Superconducting Plasma Excitation at Microwave Frequencies in Parallel Magnetic Fields in $\mathrm{\mathbf{Bi_2Sr_2CaCu_2O_{8+δ}}}$ Superconducting Plasma Excitation at Microwave Frequencies in Parallel Magnetic Fields in $\mathrm{\mathbf{Bi_2Sr_2CaCu_2O_{8+δ}}}$

2000-10-02

arxiv.org/abs/cond-mat/0010034v1

Physica C Vol. 362 71-77 (2001)

Physics

Condensed Matter

Superconductivity

submitted to Physica C (Prceedings of Plasma2000, Sendai)

Scientific paper

10.1016/S0921-4534(01)00649-9

Josephson plasma resonance has been studied in a wide microwave frequency range between 10 and 52 GHz in a magnetic field parallel to the $ab$-plane in under-doped $\BI$. Above about 30 GHz two resonance modes were observed: one (LT mode) appears at low temperatures and another (HT mode) at higher temperatures, leaving a temperature gap between two regions. These two resonance modes exhibit a sharp contrast each other both on temperture and magnetic field dependences and show distinct characters different entirely from the c-axis Josephson plasma resonance. From temperature and field scan experiments at various frequencies it is suggested that the LT mode can be attributed to the coupled Josephson plasma mode with Josephson vortices, while the HT mode is a new plasma mode associated possibly with the periodic array of Josephson vortices.

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