Woon Kang

A high temperature phase transitional behavior in the organic superconductor (TMTSF)2ClO4 (tetramethyltetrafulvalenium-perchlorate) was manifest in our1H NMR measurements.Our observations are discussed in the light of a dimensional crossover ofthe electronic transport.. 2002 Elsevier Science B.V. All rights reserved.

SnMo 4 O 6 was synthesized at low temperature from the mixture of MoO 2 and Mo 2 O 3 using Sn flux. The structure of this compound was determined by the single-crystal X-ray diffraction method. It crystallizes in the tetragonal space group P 4/ mbm with a = 9.580(4) and c = 2.843(6). The structure of SnMo 4 O 6 is composed of edge-sharing Mo 6 O 12 chains extending down the c axis, and four chains are connected to form channels filled with Sn cations. The resistivity measurement for SnMo 4 O 6 a

Molecular motions in an organic superconductor, (TMTSF)2PF6, were investigated by means of19F NMR. The temperature dependence of the spinlattice relaxation rate was tted with two distinct molecular motions, indicating two dierent modes ascribedto the distorted octahedral anion sublattice. As a result, anisotropic anionic motions, which may trigger the subtle mesoscopic electronic instability in this quasi-1D conductor, were revealed.

The 19F nuclear magnetic resonance spin-lattice relaxation in an organic superconductor, (TMTSF)2PF6, was investigated in view of the molecular motions of the anionic sublattice structure. The temperature dependence of the spin-lattice relaxation was described well by the anionic molecular motions in unequal potential wells with distinct activation energies and correlation times.

A unique and rare opportunity of revealing the nature of the spin-density-wave (SDW) fluctuation in the quasi-one-dimensional organic conductor (TMTSF)2PF6 has been provided by our AC impedance measurements above the SDW transition temperature. A close resemblance of the low-frequency dielectric response in the range between 20 K and the temperature of maximum resistivity Tmax 80 K to that in the SDW ground state was revealed, with quite compatible exponents for their power law dependencies. Th

High magnetic eld in addition to low temperature and high pressure plays an important role in the study of transport propertiesof low-dimensional electron systems found in organic conductors, especially those in the Bechgaard salts. Magnetoresistance as afunction of eld direction as well as magnetic eld strength shows magnetic oscillations, resonant behaviors, and quantum eects.Comparison of these properties among various Bechgaard salts is particularly informative because anions impose many die

Four-probe device of single ZnO nanowire was fabricated by electron beam lithography. Electrical characterizations in a two-probe and a four-probe configuration with a back-gate were carried out to clarify the relative contribution of the contact and the intrinsic part in a ZnO nanowire. I-V characteristic in four-probe measurement showed an ohmic behavior with a high conductivity, 100 S/cm, which was better than those of two-probe measurement by 10 times. At the same values of the current betwe

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