Creation and control of charge cluster glass phases

2011 Fiscal Year Final Research Report

• Project/Area Number: 21340106
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Nagoya University (2010-2011); Waseda University (2009)
• Principal Investigator: TERASAKI Ichiro 名古屋大学, 理学研究科, 教授 (30227508)
• Co-Investigator(Renkei-kenkyūsha): KOBAYASHI Wataru 筑波大学, 助教 (70434313) ; KATSUFUJI Takuro 早稲田大学, 理工学術院, 教授 (00272386) ; MORI Hatsumi 東京大学, 物性研究所, 教授 (00334342) ; MORI Takehiko 東京工業大学, 理工学研究科, 教授 (60174372) ; NOGAMI Yoshio 岡山大学, 自然科学研究科, 教授 (10202251)
• Project Period (FY): 2009 – 2011
• Keywords: 強相関系

Research Abstract

Charge order is a kind of electronic phase that is realized in strongly correlated electron systems, which is driven by the inter-site Coulomb repulsion. Thus depending on the anisotropy of the inter-site Coulomb repulsion, conduction electrons are regularly localized with different patterns. Some of them will compete and coexist to show a glass-like pattern consisting of charge-ordered domains. The principal investigator calls this“charge cluster glass", and have tried to create and control this new electron phase. Some of the results highlights(1) a charge cluster glass is created in rapidly-cooledθ-(BEDT-TTF) 2RbZn(SCN) 4, and the nonlinear conduction in this glass phase is controlled,(2) anomalous dielectric relaxation is discovered inκ-(BEDT-TTF) 2Cu2(CN) 3, which is ascribed to a cluster glass phase of different antiferroelectric domains,(3) a new type of cluster glass phase is discovered inβ-(meso-DMBEDT-TTF) 2PF6, which is composed of dimmer Mott insulator phase and charge ordered phase. Through these findings, the principal investigator has clarified that the cluster glass phases discovered in this research share generic features in common as a competing ordered state in strongly correlated electron systems.

Research Products

• [Journal Article] Polaron formation as a genuine nonequilibrium phenomenon (2011)
  • Author(s): S. Ajisaka, S. Tasaki, and I. Terasaki
  • Journal Title: Phys. Rev Volume: 83 Pages: 4
  • DOI: DOI:10.1103/PhysRevB.83.212301
• [Journal Article] Optical study of the electronic structure and correlation effects in K0. 49RhO2 (2011)
  • Author(s): R. Okazaki, Y. Nishina, Y. Yasui, S. Shibasaki, and I. Terasaki
  • Journal Title: Phys. Rev Volume: 84 Pages: 4
  • DOI: DOI:10.1103/PhysRevB.84.075110
• [Journal Article] A mechanism of dc-ac conversion in the organic thyristor (2010)
  • Author(s): T. Suko, I. Terasaki, H. Mori and T. Mori
  • Journal Title: Materials Volume: 3 Pages: 2027-2036
  • DOI: doi:10.3390/ma3032027
• [Journal Article] Charge order competition leading to nonlinearity in organic thyristor family (2010)
  • Author(s): Y. Nogami, N. Hanasaki, M. Watanabe, K. Yamamoto, T. Ito, N. Ikeda, H. Ohsumi, H. Toyokawa, Y. Noda, I. Terasaki, H. Mori and T. Mori
  • Journal Title: J. Phys. Soc. Jpn. Volume: 79 Pages: 5
  • DOI: DOI:10.1143/JPSJ.79.044606
• [Journal Article] Anomalous dielectric response in the dimer Mott insulatorκ-(BEDT-TTF)_2Cu_2(CN)_3 (2010)
  • Author(s): M. Abdel-Jawad, I. Terasaki, T. Sasaki, N. Yoneyama, N. Kobayashi, Y. Uesu, and C. Hotta
  • Journal Title: Phys Rev. Volume: 82 Pages: 5
• [Journal Article] Nonequilibrium Charge Ordering inθ-(BEDT-TTF)_2MM'(SCN)_4(M=Rb, Cs ; M'=Co, Zn) (2010)
  • Author(s): I. Terasaki, S. Tasaki, S. Ajisaka, Y. Nogami, N. Hanasaki, M. Watanabe, H. Mori, and T. Mori
  • Journal Title: Physica Volume: 405 Pages: S217-S220
• [Journal Article] Anomalous temperature dependence of the thermopower in the organic compound theta-(BEDT-TTF)_2RbM(SCN) 4(M=Zn, Co) (2009)
  • Author(s): M. Abdel-Jawad, I. Terasaki, H. Mori and T. Mori
  • Journal Title: Phys. Rev Volume: 80 Pages: 5
  • DOI: DOI:10.1103/PhysRevB.80.085104
• [Presentation] Nonlinear conduction phenomena in the Mott insulator Ca_2RuO_2 (2012)
  • Author(s): R. Okazaki, Y. Nishina, Y. Yasui, I. Terasaki, F. Nakamura, Y. Kimura, M. Sakaki, T. Suzuki
  • Organizer: American Physical Society March Meeting 2012, Boston
  • Year and Date: 20120202-03
• [Presentation] Current-induced Mott transition in Ca_2RuO_4 (2011)
  • Author(s): R. Okazaki, Y. Nishina, Y. Yasui, I. Terasaki, F. Nakamura, Y. Kimura, M. Sakaki and T. Suzuki
  • Organizer: Strongly Correlated Electron Conference(SCES) 2011
  • Place of Presentation: Cambridge
  • Year and Date: 20110829-0903
• [Presentation] A mechanism of inverter effect in the organic thyristor ISSP-MDF Workshop (2010)
  • Author(s): I. Terasaki, T. Suko, H. Mori, T. Mori, M. Watanabe and Y. Nogami
  • Organizer: Kashiwa
  • Place of Presentation: 招待講演
  • Year and Date: 20100701-03
• [Presentation] 有機導体の電荷秩序と電流効果 (2010)
  • Author(s): 寺崎一郎
  • Organizer: 日本物理学会大阪府立大学
  • Place of Presentation: シンポジウム講演
  • Year and Date: 2010-09-23
• [Presentation] 量子電気双極子-dimer Mott絶縁体が示す誘電異常 (2009)
  • Author(s): 寺崎一郎
  • Organizer: 分子研研究会「新規な誘電体最前線電子と強誘電性」
  • Place of Presentation: 招待講演
  • Year and Date: 20091030-31
• [Presentation] Nonequilibrium Charge Ordering inθ-(BEDT-TTF)_2MM'(SCN)_4(M=Rb, Cs ; M'=Co, Zn) (2009)
  • Author(s): I. Terasaki, S. Tasaki, S. Ajisaka, Y. Nogami, N. Hanasaki, M. Watanabe, H. Mori, and T. Mori
  • Organizer: The 8th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets(ISCOM2009)
  • Place of Presentation: Niseko
  • Year and Date: 2009-09-17
• [Remarks] ホームページ等情報公開
  • URL: http://vlab-nu.jp/