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2015 Fiscal Year Final Research Report

Elucidation of the time-space evolution processes for the photo-induced phase transition in titanium oxides

Research Project

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Project/Area Number 25400315
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Condensed matter physics I
Research InstitutionNihon University (2014-2015)
University of Tsukuba (2013)

Principal Investigator

KAMIOKA Hayato  日本大学, 文理学部, 准教授 (40431671)

Project Period (FY) 2013-04-01 – 2016-03-31
Keywords光誘起相転移 / 超高速分光 / イメージング測定 / チタン酸化物 / マグネリ相 / THz測定 / 結晶成長
Outline of Final Research Achievements

We studied the photo-induced phase transition (PIPT) dynamics in Ti4O7 through time-resolved reflection spectroscopy and imaging methods, where the single crystals were fabricated by our systematic procedures. The photo-irradiation in the low temperature phase and intermediate phase induced spontaneous domain growth of the induced high temperature metallic phase. Our analysis indicate that the growth process includes two steps, the first step caused by electron-lattice interactions, and the second caused by the acoustic phonon in the core titanium dioxide.
The PIPT was also investigated using a terahertz-probe technique, which is sensitive for appearance of metallic phase. The photo-irradiation in the low temperature phase induces an ultrafast decrease in the probe transmittance, corresponding to the generation of a metallic domain. Thus we reconfirm our interpretation through the nonlinear properties of the transmission amplitudes and lifetime components on the excitation density.

Free Research Field

光物性物理学

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Published: 2017-05-10  

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