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2011.03.31 平成22年度研究報告3 大島勇吾、田久保直子、山下智史、Abdel Jawad Majed
2011.03.04 平成22年度研究報告2 田嶋尚也、野村光城、崔亨波、田嶋陽子
2011.02.17 平成22年度研究報告1 山本浩史、草本哲郎、須田理行
2011.02.10 "Electronics for Chemists (and Physicists too!)" 大島 勇吾
You can't do scientific research without electronic instruments, such as PCs, measurement system for physical properties, pumps, evaporators, ovens, etc. And the heart of these instruments are power supplies.
If you have a lot of money you just buy them, and it's done. But, is your power supply an appropriate one? or is it not over spec? In my seminar, I will talk about the basic of electronics, the "power supply". It is very easy, and after the seminar, you will be able to make one yourself. You can even make a constant current source for growing your samples.
2011.02.03 "マスター論文発表：有機Mott絶縁体κ-(BEDT-TTF)2Cu[N(CN)2]Clに対する静電キャリアドーピングとMott転移" 上野 純
2011.01.27 "Thermodynamics for Study of Condensed Matter Science" 山下 智史
A temperature dependence of heat capacity is fundamental but really important information for studying condensed matter science. The PPMS calorimeter is famous and useful tool for measuring heat capacity.
However, sometimes this tool shows uncertain information due to the principle of measurement method and program of this tool.
In this seminar, I will talk about the reasons of wrong measurement in represented method. And the way to measure accurate heat capacity by introducing some references and my knowledge. I hope that this talk reducing misunderstanding of thermodynamics in study of condensed matter science.
2010.12.09 Pacfichem 2010 Practice & Julien's Final Report in Japan
2010.11.25 "MMX型擬一次元鎖錯体の電子状態制御とナフタレンジイミドを有する伝導体の合成" 井口 弘章（東北大学 山下研究室）
The MMX-type 1D-halogen-bridged complexes (MMX chains) have various charge-ordering states. I would like to present some latest interesting propeties of MMX chains. Particulary, the MMX chains which include two components of countercations show reversible change of the structure and the charge-ordering state controlled by dehydration/hydration of the lattice water molecules. I will also present the synthesis and the physical properties of the organic conductor based on naphthalenediimide (NDI) derivertive.
2010.11.11 "A Small Atom with a Big Ego: Use of Fluorinated Molecules for Material Science" 野村 光城
Fluorine atom is “a small atom with a big ego” because it does so many valuable things. The vdW radius of fluorine atom (1.35 A) is comparable with that of the smallest hydrogen atom (1.20 A), but fluorine atom is most electronegative of all. Namely, a fluorination of an organic molecule does not change the molecular size enough, but the molecular property can be modified well by the electronegativity of fluorine atom. Here I present organic fluorine chemistry and their possible applications for material science using fluorinated compounds that involve fluorinated dithiolene complexes, fluorinated TTFs, fluorinated aromatics, fluorine-doped metal oxides and so on.
2010.11.04 "有機電界効果トランジスタにおける電荷キャリアの電場誘起ESR研究（Field-Induced ESR Study of Charge Carriers in Organic Field-Effect Transistors）" 渡辺 峻一郎（名古屋大学工学研究科マテリアル理工学専攻）
Field-induced charge carriers in organic transistors based on p-conjugated polymers have been investigated by ESR. Our pioneering field-induce ESR method can directly reveal microscopic properties of charge carriers at the device interface including spin states, charge carrier concentration and interfacial molecular orientations. In this seminar, recent developments, such as ultrathin-film transistors and polymer/fullerene composite system, will also be discussed.
2010.10.28 "有機伝導体における光誘起絶縁体−金属転移の超高速ダイナミクス（Ultrafast dynamics of photoinduced insulator to metal transition in organic conductors）" 岩井 伸一郎 教授（東北大学 岩井研究室）
Photo-excitations of highly correlated organic salts are of great interest because the application to ultrafast devices and the discovery of new nonequilibrium phases are expected. We performed ultrafast spectroscopy using few-optical-cycle (10 fs) infrared pulses and THz pulses in layered BEDT-TTF salts. i) Early-stage snapshot of photoinduced insulator to metal transition in 10-100 fs and ii)low-energy (< 10 meV) charge dynamics of the photoinduced metallic state will be discussed.
2010.10.14 "Is the Dirac Cone Special Structure Only in Graphene and α-ET2I3?" 田嶋 尚也
Zero-gap system with Dirac cone type energy dispersion was realized in graphene and α-ET2I3. However, Dirac cone is not special structure. Although the Dirac points are far from Fermi level, it exists in various materials. (Note that graphene and α-ET2I3 is the special material because Dirac points locate at the Fermi level.) Recently, Dirac cone was observed in the topological insulator and the Fe-based superconductor. In this seminar, I will give you some examples of those Dirac cone. Please take it easy. I only show colorful figures.
2010.07.27 平成22年度中間報告3 大島勇吾、田久保直子、山下智史、Abdel Jawad Majed
2010.07.22 平成22年度中間報告2 田嶋尚也、崔亨波、野村光城、田嶋陽子
2010.07.15 平成22年度中間報告1 山本浩史、草本哲郎、須田理行、上野純、Julien Lieffrig
2010.06.10 "Magnetic Field Dependence of Coupled Spin-Peierls and Charge Density Wave States in Per2[Pt(mnt)2]" Prof. James S. Brooks, Florida University
195Pt NMR has been used to explore the magnetic field dependence of the spin-Peierls behavior of Per2[Pt(mnt)2], which exhibits a coexisting spin-Peierls and charge density wave ground state. We find that the 195Pt NMR spectrum and relaxation rate is strongly dependent on temperature and magnetic field, and that the 195Pt NMR signal vanishes in an anomalous manner along a temperature-field phase boundary consistent with the vanishing of the high resistance state observed in electrical transport measurements. The results are discussed in terms of Perylene (non-magnetic Peierls) and Pt(mnt)2 (spin 1/2 spin-Peierls) interacting chains in high magnetic fields. A recent proton NMR investigation that complements the 195Pt NMR behavior will also be discussed.
2010.06.03 "Generation and Detection of Pure Spin-Current" 山本 浩史
Recent rapid development in spintronics has made it possible to generate and detect pure spin-current. In this seminar, experimental results on non-local detection of spin current, spin Hall effect, inverse spin Hall effect, and spin Seebeck effect will be discussed.
2010.05.27 "Photo-Tuning of Organic-Inorganic Interface Properties Utilizing Photochromism 〜To Realize Future Photo-Molecular Devices〜" 須田 理行
Organic-inorganic hybrid devices have great potential for realizing unprecedented functions because they can combine the "flexibility or functionality" of organic materials and the "chemical or mechanical strength" of inorganic materials. In particular, it has been expected to use "light" as a trigger for tuning various functionalities. In this seminar, a novel strategy that involves the incorporation of photochromism into an inorganic functional nano-structure to realize photo-controllable functional interfaces will be introduced. Firstly, I will introduce significant photo-induced changes in ferromagnetism at the interfaces between azobenzene-derivatized thiols and gold. Furthermore, I will also introduce a reversible photo-control of electron.
2010.05.20 "Thermodynamic Study of Quantum Spin Liquid Behaviors in Organic Mott Insulators with Triangular Lattice Structure" 山下 智史
Quantum spin liquid problem is one of the central topics of condensed matter science. Recently, the quantum spin liquid behaviors were observed in organic charge transfer salts EtMe3Sb[Pd(dmit)2]2 and κ-(BEDT-TTF)2Cu2(CN)3. For the understanding of the detail characters, multifaceted experimental approach for these materials is necessary. Especially, specific heat measurement is one of the most effective methods to study this state, since this method is a kind of high-sensitive spectroscopy for low-energy excitations. In this seminar, I will introduce the thermodynamic character of two spin liquid materials. The excitation structure and unexpected crossover phenomena are demonstrated as a common feature of organic quantum spin liquid. I will also introduce the difference between two spin liquid materials. An anomalous enhancement of heat capacity by deuteration is only observed in Pd(dmit)2 system. The details of the common features and differences will be discussed.
2010.05.13 "TEMPO-bound Metalladithiolenes: SOMO-HOMO Converted Unique Electronic Structure and Their Physical and Chemical Properties" 草本 哲郎
Metalladithiolenes show interesting physical properties such as electrical (super-)conductivity, magnetism, and optical properties. Since these properties are based on their electronic structures, it is quite important to design / control them to attain desired (or novel) properties. I developed TEMPO-bound metalladithiolenes exhibiting unique electronic structures, in which the energy level of the TEMPO-based orbital (SOMO) is lower than the p-conjugated dithiolene-based one (HOMO). A novel chemical phenomenon, an intramolecular cyclization reaction of TEMPO, was achieved based on this electronic structure.
2010.05.06 "Phase diagram of κ-(BEDT-TTF)2Cu2(CN)3: a charge degree of freedom perspective" Abdel Jawad Majed
The pressure and temperature dependence of the organic Mott insulator κ-(BEDT-TTF)2Cu2(CN)3 has been investigated by resistivity and dielectric constant measurements. In the absence of pressure and owing to its triangular lattice of dimerized molecules, κ-(BEDT-TTF)2Cu2(CN)3 is thought to be an ideal playground to study a spin-liquid state. However, we have found that nontrivial charge degrees of freedom exist in this dimer-system with similar dynamics to a dipole-glass state. Comparison to different dimerized materials and discussion of the pressure dependence on the charge degrees of freedom will be made.