Takekazu Ishida

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The 1:1 salt of a new donor molecule, ethylenedithiotetrathiafulvalenothioquinone-ethylenedithio-1,3-dithiolemethide (1), with FeBr4- ion, 1 x FeBr4, was prepared and found to exhibit a room-temperature electrical conductivity of 4 x 10(-2) S cm(-1) and semiconducting behavior with an activation energy of 170 meV. The paramagnetic susceptibility obeyed the(More)
The magnetic torque of a high-quality PrFeAsO1−y single crystal has been investigated at temperatures from 10K to 45K in magnetic fields from 5kG and 50 kG. We find that the superconducting anisotropy γ in PrFeAsO1−y can be approximated by γ = 1.08 + 0.0068T in all fields by employing the Kogan model. The reduced superconducting anisotropy in the PrFeAsO1−y(More)
Magnetization and heat capacity were measured down to 0.4 K in a 2:1 charge-transfer (CT) salt of a new donor molecule, ethylenedithiotetrathiafulvalenoquinone-1,3-dithiolemethide (1) with a magnetic FeBr(4)(-) ion (1(2).FeBr(4)). The Fe(III) d spins of FeBr(4)(-) ions were subject to apparently ferromagnetic interaction with each other through the(More)
  • T Ishida
  • Nichidai kōkū kagaku = Nihon University journal…
  • 1989
Maxillary invaginated incisor teeth have been pathomorphologically investigated and some results have been obtained as follows: 1) The classification used in this study is as follows. That is, class I: Invagination is limited within the enamel. class II: Invagination extends toward the pulp chamber in a manner of pipe. class III: Invagination seen in class(More)
We propose a neutron diffractometer system based on MgB2 thin film detectors and an SFQ signal processor. Small dimensions of MgB2 thin film detectors and high processing capability of the single flux quantum (SFQ) circuits enable us to handle several thousand or more detectors in a cryocooler, leading to a very compact system. In addition, the system can(More)
One of the fundamental problems in many-pixel detectors implemented in cryogenics environments is the number of bias and read-out wires. If one targets a megapixel range detector, number of wires should be significantly reduced. One possibility is that the detectors are serially connected and biased by using only one line and read-out is accomplished by(More)
By the reaction of new donor molecules, bis(ethylenedithio)tetrathiafulvalenoquinone(-thioquinone)-1,3-dithiolemethides [BEDT-TTFVO (1) and BEDT-TTFVS (2)] with FeX3 (X = Cl, Br) in CS2/CH3CN, 1:1 salts of 1 or 2 with an FeX4- ion (1.FeX4 and 2.FeX4) were obtained as black needle crystals. Their crystal structures are very similar to each other, in which(More)
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