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Keizo Murata,Harukazu Yoshino,Tsutomu Nakanishi,Takako Konoike,James Brooks,David Graf,Charles Mielke,George C. Papavassiliou 한국물리학회 2004 Current Applied Physics Vol.4 No.5
In the two-dimensional organic conductor, τ-(EDO-S,S-DMEDT-TTF)2(AuBr2)1+ y, we have observed Shubnikov de Hass oscillations with Landau level down ton ¼ 2 in eld up to 27 T. Motivated with this result, we extended to Hall eect study in pulsed magnetic eld up to 60 T as well as in dc eld up to 45 T and found Hall resistance plateau above 40 T (n ¼ 1). Since this system consists of two two-dimensional Fermi surface pockets, and larger pocket has a large eective mass compared with the smaller one,larger Fermi pocket behaves as a reservoir for the smaller pocket to be well-separated into completely lled and completely emptyLandau levels in a certain range of temperature and magnetic eld. The interpretation of realizing the Hall plateau can beunderstood as a new mechanism for QHE, but is quite dierent neither from localization nor eld induce spin density wave state inorganic TMTSF salts.
Katsiotis, Marios S.,Fardis, Michael,Al Wahedi, Yasser,Stephen, Samuel,Tzitzios, Vasilios,Boukos, Nikolaos,Kim, Hae Jin,Alhassan, Saeed M.,Papavassiliou, Georgios American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.6
<P>A nanosized HY zeolite was synthesized and studied by means of <SUP>1</SUP>H and <SUP>27</SUP>Al NMR during thermal dehydration in the temperature range 20–600 °C. The nanozeolite is comprised of a mixture of well-crystallized ultrathin platelets and octahedral nanocrystals, dressed with pentacoordinated extraframework Al<SUP>(V)</SUP>. <SUP>1</SUP>H NMR spin–lattice (<I>T</I><SUB>1</SUB>) and spin–spin (<I>T</I><SUB>2</SUB>) relaxation measurements in combination with <SUP>27</SUP>Al 3Q-MAS NMR reveal two different interaction paths between water molecules and the nanozeolite solid matrix: (i) water molecules strongly interacting with Al<SUP>(V)</SUP> cations, indicated by the high <I>T</I><SUB>1</SUB>/<I>T</I><SUB>2</SUB> ratio, and (ii) water molecules with amply smaller <I>T</I><SUB>1</SUB>/<I>T</I><SUB>2</SUB> ratio, interacting moderately with Al<SUP>(IV)</SUP> and Al<SUP>(VI)</SUP> cations. Relevant measurements on bulk HY rich in extraframework Al<SUP>(VI)</SUP> show the presence of the second relaxation channel only, indicating that the enhanced water adsorption observed for the nanozeolite originates partly from its extended surface and partly from the Al<SUP>(V)</SUP> decoration. Al<SUP>(IV)</SUP> sites in the nanozeolite appear to be highly resilient during heating, even while the framework starts to collapse and Al<SUP>(VI)</SUP> transforms to Al<SUP>(V)</SUP>. Finally, <SUP>1</SUP>H NMR shows that water protons interact particularly strongly with the Al sites in the nanozeolite at temperatures as high as 500 °C, unveiling the important role of the Al<SUP>(V)</SUP> decoration on this nanocatalyst.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-6/jp513030w/production/images/medium/jp-2014-13030w_0013.gif'></P>