Fluxon Dynamics of High-TC superconductor and device application for THz wave.

高TC超导体Fluxon动力学及太赫兹波器件应用。

• 批准号: 20360151
• 负责人: NAKAJIMA Kensuke
• 金额: $ 11.98万
• 依托单位: Yamagata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20360151/
• 关键词: 高温超伝導体; 固有ジョセフソン接合; ボルテクス; テラヘルツ; 磁束量子; ジョセフソン効果; ナノデバイス

Bi_2Sr_2CaCu_2O_8(Bi-2212) High-T_C superconductor intrinsic Josephson junction(IJJ) is a promising candidate of intense terahertz emitting device. At present, elucidation of the interaction between the traveling fluxons and electromagnetic wave in the junction (Josephson plasma modes) are key to succeed in the terahertz emissions. In this research, we have elucidated (1) Antenna integration effects on flux-flow properties of Bi-2212 IJJ, (2) Excitation phenomena of plasma resonance mode of Bi-2212 IJJ by flux-flow, and demonstrated (3) Terahertz plasma resonance emission from current-injected Bi-2212 IJJ. In addition to above mentioned results, we have comprehensively studied carrier control of Bi-2212 single crystal which dominates junction parameters of Bi-2212 IJJ. As the result, we have found that a partial substitution of Ca site by Y can controls carrier concentration with no degradation in T_C.

Bi_2Sr_2CaCu_2O_8(Bi-2212)高温超导本征约瑟夫森结(IJJ)是一种很有前景的强太赫兹发射器件。目前，阐明行进磁通子与结中电磁波（约瑟夫森等离子体模式）之间的相互作用是太赫兹发射成功的关键。在这项研究中，我们阐明了（1）天线积分对Bi-2212 IJJ通量流特性的影响，（2）通量流对Bi-2212 IJJ等离子体共振模式的激发现象，并证明了（3）太赫兹等离子体电流注入 Bi-2212 IJJ 的共振发射。除了上述结果外，我们还全面研究了Bi-2212单晶的载流子控制，它决定了Bi-2212 IJJ的结参数。结果，我们发现用Y部分取代Ca位点可以控制载流子浓度而不降低T_C。

项目成果

Cavity Resonance Effects on Phase-Locking of the Flux-Flow in Bi-2212 Intrinsic Josephson Junctions

• DOI: 10.1109/tasc.2010.2090319
• 发表时间: 2011-06
• 期刊: IEEE Transactions on Applied Superconductivity
• 影响因子: 1.8
• 作者: K. Nakajima;M. Isobe;T. Chiba;H. Yamada

Tunable THz sources with large Josephson junctions

具有大约瑟夫森结的可调谐太赫兹源

• 发表时间: 2009
• 作者: H. B. Wang;S. Guenon;J. Yuan;Z. G. Jiang;Y. Y. Zhong;P. H. Wu;A. Ishii;T. Hatano;G. Boris;M. Gruenzweig;D. Koelle;and R. Kleiner
• 通讯作者: and R. Kleiner

RF impedance of intrinsic Josephson junction in flux-flow state with a periodic pinning potential and its optimum condition for RF radiation

周期性钉扎势磁通流状态下本征约瑟夫森结的射频阻抗及其最佳射频辐射条件

• 发表时间: 2009
• 期刊: Physica C. vol.469
• 作者: Y.Yamada;Ken. Nakajima;Koji Nakajima
• 通讯作者: Koji Nakajima

RF impedance of intrinsic Josephson junction in flux-flow state with a periodic pinning potential

具有周期性钉扎电势的通量流状态下本征约瑟夫森结的射频阻抗

• 发表时间: 2008
• 期刊: Physica C 468
• 作者: Y. Yamada;Kensuke Nakajima;Koji Nakajima
• 通讯作者: Koji Nakajima

Intrinsic Surface Resistance of YBCO Thin, Films under DC Magnetic Field, IEEE Trans.

直流磁场下 YBCO 薄膜的固有表面电阻，IEEE Trans。

• 发表时间: 2011
• 期刊: Appl.Supercond. (in press.)
• 作者: K.Nakagawa;T.Honma;K.Takeda;S.Ono;H.Kai;A.Saito;M.Mukaida;K.Nakajima;S.Ohshima
• 通讯作者: S.Ohshima