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Research Contents

  • ■ Non-Liner Optics
  • ■ SHG Microscopy
  • ■ PLD Method
  • (Under Construction)

Research Targets

  • ■ PZT ThinFilm
  • ■ PZT Application
  • ■ LT/LN ThinFilm
  • ■ YFO ThinFilm
  • ■ BFO Bulk
  • ■ BFO ThinFilm
  • ■ Cr2O3 Bulk
  • ■ Muscle Fiber
  • (Under Construction)
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Strategy & Tactics of Reserach in Uesu Laboratory

Responses of materials to external fields are termed “susceptibility” which are forthright material constants and the most important subject in various fields of physics extending over material physics, soft matter physics and biophysics. So far the susceptibility has been related to atomic fluctuations in the scheme of the linear-response theory. However if materials have structural hierarchy, this scheme is not always so effective, but it could be more effective to relate the response with fluctuations of higher order structures in meso-scopic scale. These examples have been recently found in several materials. The colossal piezoelectric and dielectric responses in relaxors and quantum paraelectrics are examples.

We investigate these hetero-structural fluctuations of dielectrics, ferroelectrics and multiferroic materials to understand the essential mechanism of the responses of these materials. For this purpose, we fabricate artificial hetero-structures in form of thin films by using a pulsed laser deposition (PLD) method and investigate various structural, physical and optical properties. In particular, we have developed the second-harmonic generation interference microscopy (SHGIM) that enables us to obtain 3D hetero-structures of the inside in non-destructive way.

The followings are the list of typical recent papers we published, some of them are performed with collaborations of foreign groups.

List of publications

1. 上江洲由晃、横田紘子：光第2高調波顕微鏡で観る分域構造、日本物理学会誌(解説および表紙)
印刷中 vol.66, no.2 (2011)
2. J. Kaneshiro and Y. Uesu: Domain structure analysis of Pb(Zn1/3Nb2/3)O3-9%PbTiO3 single crystals using optical second harmonic generation microscopy, Phys. Rev. B82, 184116(2010)
3. J.Kaneshiro, Y. Uesu, T.Fukui, Visibility of inverted domain structures using the second harmonic generation microscope - Comparison of interference and non-interference cases- J.Opt.Soc.America, B27, 888(2010)
4. G.Genste, J.M.Kiat, H.Yokta,Y.Uesu, F.Porcher: Polar clusters in impurity-doped quantum paraelectric K1-xLixTaO3, Phys.Rev.B, B81, 144112 (2010)
5. N.A.Pertsev, P.-E.Janolin, J.M.Kiat, and Y.Uesu: Enhancing permittivity of ferroelectric superlattices via composition tuning, Phys.Rev.B81, 144118(2010)
6. M.Abdel-Jawad, I.Terasaki, T.Sasaki, N.Yoneyama, N.Kobayashi, Y.Uesu, C.Hotta: Anomalous dielectric response in the dimer Mott insulator kappa-(BEDT-TTF)2 -Cu-2(CN)3, Phys,Rev. B82, 125119 (2010)
7. J.Kaneshiro, Y.Uesu: Optical and nonlinear optical investigations of phase transition of Pb(Zn1/3Nb2/3)-9%PbTiO3 single crystals, Jpn.J.Appl.Phys. 49, 09ME02 (2010)
8. K. Azumi, K. Aoyama, S. Asanuma, Y. Uesu, T. Katsufuji: Direct observation of a repeatable change in electronic states with applied electric voltage pulses in the metal-insulator-metal structure, Phys. Rev. B79, 121101(R) (2009)
9. H.Yokota, R.Haumont, J.M.Kiat, H.Matsuura, Y.Uesu: Second harmonic generation microscopic observations of a multiferroic BiFeO3 single crystal, Appl.Phys.Lett.95,082904(2009)
10. J.Kaneshiro, S.Kawado, H.Yokota, Y.Uesu, T.Fukui: Three-dimensional observations of polar domain structures using a confocal second-harmonic generation interference microscope, J.Appl.Phys.104,054112(2008)
11. S.Asanuma, Y.Uesu, C.Malibert, J.M.Kiat: Structural and dielectric characterizations of relaxor/ferroelectric superlattice films PSN-PT, J.Appl.Phys. 103,094106 (2008)
12. H.Yokota, Y.Uesu: Critical behavior of K1-xLixTaO3 with the tri-critical concentration of Li under an electric field, J. Phys. Soc. Jpn. 77, 023713 (2008)
13. P.E.Janolin, J.M.Kiat, C.Malibert, S.Asanuma, Y.Uesu: Temperature evolution of lattice strains in relaxor PbSc1/2Nb1/2O3 thin films, Appl. Phys. Lett. 92, 052908 (2008)
14. Y.Uesu, H.Yokota, S.Kawado, J.Kaneshiro, S.Kurimura, N.Kato: 3D observations of periodically poled domains in a LiTaO3 quasiphase matching crystal by second harmonic generation tomography, Appl. Phys. Lett. 91, 182904(2007)
15. M. Mitsugi, S. Asanuma, Y. Uesu, M. Fukunaga, W. Kobayashi, I. Terasaki: Origin of colossal dielectric response of CaCu3Ti4O12 studied by using multilayer thin films, Appl. Phys. Lett. 90, 242904 (2007)
16. S.Asanuma, Y.Uesu, C.Malibert, J.M.Kiat: Syntheses of relaxor/ferroelectric superlattice thin films Pb(Sc1/2Nb1/2)O3/PbTiO3 and their dielectric properties, Appl. Phys. Lett. 90, 242910 (2007)
17. H.Yokota, Y. Uesu, C.Malibert, J.M.Kiat: Second-harmonic generation and x-ray diffraction studies of the pretransitional region and polar phase in relaxor K(1-x)LixTaO3, Phys. Rev. B 75, 184113 (2007)
18. H. Yokota, Y. Uesu: Extremely slow time evolution of the order parameter under an electric field in relaxor K0.97Li0.03TaO3, J. Phys. Condensed Matter 19, 102201 (2007)
19. R.Haumont, C.Malibert, B.Dkhil, J.M.Kiat, F.Lemarrec, S.Asanuma, Y.Uesu: Observation of rotation of polarization in thin films of Pb(Sc0.5Nb0.5)O3-PbTiO3 via a Monoclinic Phase, Jpn.J.Appl.Phy.45, L42(2006)
20. M. Hamaguchi, K. Aoyama, S. Asanuma, Y. Uesu, and T. Katsufuji, "Electric-field-induced resistance switching universally observed in transition-metal-oxide thin films", Appl. Phys. Lett. 88 (2006) 142508
21. N.Kato, K.Yuasa, T.Araki, I.Hirosawa, M.Saito, N.Ikeda, K.Immura, Y.Uesu: Determination of a merocianin J-aggregate structure and the significant contribution of the electric dipole interaction to the exiton band wavelength, Phys. Rev. Lett. 94, 136404 (2005)
22. H.Yokota, T.Oyama, Y. Uesu: SHG microscopic observations of polar state in Li-doped KTaO3 under an electric field, Phys. Rev. B72, p144103 (2005).
23. Y.Uesu：Mystery of relaxors: リラクサーの謎-本質的な不均一性による巨大応答特性-, パリティ（丸善）20, 18 (2005)