Search for novel ordered states and anomalous response to the external field for quasi-triangular lattices

2015 Fiscal Year Final Research Report

• Project/Area Number: 25287090
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Waseda University
• Principal Investigator: Katsufuji Takuro 早稲田大学, 理工学術院, 教授 (00272386)
• Co-Investigator(Kenkyū-buntansha): MORI Shigeo 大阪府立大学, 工学研究科, 教授 (20251613)
• Co-Investigator(Renkei-kenkyūsha): OKUDA Tetsuji 鹿児島大学, 理工学研究科, 准教授 (20347082)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 軌道/電荷整列 / 遷移金属酸化物 / 熱電効果 / 光誘起効果

Outline of Final Research Achievements

We found (1) the competition between a charge-ordered phase and a trimer phase and an anomalous metallic state with the heavy effective mass in Ba1-xSrxV13O18 and (2) the modulation of d electrons on the Ti 1D chain in BaxTi8O16, both of which are novel odered phases on quasi-trianglar lattices of tansition-metals. We also found that (c) the phoon thermal conductivity of various titanates and vanadates with quasi-triangular lattices exhibit a universal behavior above and below the orbital/charge ordering temperature and (d) the photoinduced dynaics of polarons in various titanates with quasi-triangular lattices strongly depends on the dimensionality of the electronic structures.

Free Research Field

数物系科学