演会のお知らせ （12/21：Professor John S. Tse　Department of Physics and Engineering Physics）

2015年12月18日

演題：Working under Stress
講師：Professor John S. Tse (Department of Physics and Engineering Physics）
日時：Monday Dec. 21, 2015 From 10:00
場所：Faculty of Science Big Conference Room (理学部 1階 大会議室)
概要：
Pressure generated by external compression is a versatile thermodynamic variable to modify the electronic structure of a material. Apart from structural phase transformations,pressure can change the fundamental properties of materials.
An example is the recent observation of superconductivity in hydrogen sulphide,a gaseous molecule in the normalstate,with a critical temperature higher than dryice! In this presentation,recent results on our experimental and theoretical studies on the highpressure chemistry and physics on a variety of systems[1,2,3] will bepresented.
Through a series of examples,I will demonstrate how the properties of simple molecular radicals can be tuned from insulating paramagnets to metals and even to Fermiliquids.
Pressure can also be used to enhance the performance of thermoelectric materials increasing the efficiency of energy conversion. Finally,the synergy between advanced electronic structure calculation and experiment is illustrated[4,5].

1. D. Tian, S. Winter, A. Mailman, J. Wong, W. Yong, H. Yamaguchi, Y. Jia, J.S. Tse, S. Desgreniers, R. Secco, S. Julian, C.Q. Jin, M. Mito, Masaki, Y. Ohishiand R.T. Oakley, The Metallic State in Neutral Radical Conductors: Dimensionality, Pressure and Multiple Orbital Effects, J. Amer. Chem. Soc., 137, 14136, 2015.
2. S. Desgreniers, J.S. Tse, T. Matsuoka, Y. Ohishi, J.J. Tse, Mixing unmixables: unexpected formation of Li-Cs alloys at low pressure, Science Advances, 1, e1500669, 2015.
3. J. Zhao, Z. Liu, R.A. Gordon, K. Takarabeand J.S. Tse, Pressure-induced phase transition and electrical properties of thermoelectric Al-doped Mg2Si, J. Appl. Phys., 118,145902, 2015.
4. Y. Li, J. Hao, H. Liu, S. Lu and J.S. Tse, High energy density and superhardnitrogen-rich B-N compounds, Phys. Rev. Lett., 115, 105502, 2015.
5. M. Wu, J.S. Tse, S. Wang, C-Z Wang, and J.Z. Jiang, Origin of Pressure-Induced Crystallization of Ce75Al25Metallic Glass, Nature Comm., 6, 6493, 2015.0

連絡先：久保園芳博（内線７８５０）