Physics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007njph....9...47s&link_type=abstract
New Journal of Physics, Volume 9, Issue 3, pp. 47 (2007).
Physics
3
Scientific paper
We have observed crossover from superconducting state to normal state in optimally doped YBa2Cu3O7-δ (T_c \sim 90\,K) in very high magnetic fields (B) up to 600 T applied parallel to CuO2 planes ({\bm B}{\perp}c). This is the first systematic critical field measurement at low temperatures in the geometry of the B parCuO2-planes using superconductors with Tc greater than 90 K. In order to perform high-sensitivity magneto-conductivity measurements in short-pulsed high magnetic fields, we developed a contactless radio frequency transmission technique. Ultrahigh magnetic fields higher than 200 T are generated by using electromagnetic flux compression, while a single-turn coil system is used for generating magnetic fields up to 200 T. We observed clearly the crossover from the superconducting to normal state conductivity at 250 T at a temperature of 5 K, and a systematic decrease of the critical field with increasing temperature. The field temperature phase diagram was constructed over a wide temperature range between 5 K and 300 K.
Matsuda Yasuhiro H.
Miura Noboru
Sekitani Tsuyoshi
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