01 THz Wave Absorbance Properties of YBa 2 Cu 3 O 7 − δ Systems Superconductor

------------------------------------------------------------------------------------------------------------------------------------------------14:00-15:40 Poster Session Pos1 Room ; 43, 44 ------------------------------------------------------------------------------------------------------------------------------------------------Pos1.01 THz Wave Absorbance Properties of YBa2Cu3O7−δ Systems Superconductor YASUDA Arata a; NAKAJIMA Nobuhiro a; SASAKI Tetsuo b a)National Institute of Technology, Tsuruoka College, Dept. CISE, Japan, b)Shizuoka University, RIE, Japan We report an investigation of the THz wave absorbance properties of Y-Ba-Cu-O (YBCO) superconductor systems. YBa2Cu3O7-δ samples were baked at 900oC and then mixed with polyethylene powder. Portions of 6 mg of the mixed samples were molded into pellets. Using a THz spectroscopy system, the frequency could be tuned from 0.5 to 6.0 THz. Samples were measured at 70 K (below the YBCO superconducting transition temperature) and 300 K, and the respective THz absorbance spectra of YBa2Cu3O7-δ were compared. The 300 K spectrum featured several absorbance peaks, for instance, at around 3.0 and 4.2 THz. However, these peaks were absent in the 70 K spectrum. We assume that these THz absorbance peaks arose from defects or structural vibrations in the YBCO crystals, which would influence the superconductive mechanism. On the basis of the results obtained in this study, we propose that THz spectroscopy offers a novel and suitable analysis system for superconductor materials.