Yoshiharu Matsuoka

Two-Photon Ionization of Cesium and Sodium Vapors

The breakdown and the growth of plasma of cesium and sodium vapors by an intense laser beam are investigated. The minimum intensity which is observable by a double probe is found to be inversely proportional to the root of the neutral atom density for either vapor. This result confirms that the two-photon ionization is a dominant process in the stage of breakdown. Further increase of the intensity of laser beam leads to a steep rise of the plasma density proportional to the square of the intensity followed by a slow rise and then the second steep rise. The first steep rise is explained by the two-photon ionization process too. The electron temperatures are estimated to be about 10 4 °K under the condition of the present work, by the probe and optical methods.

Thermal Conductivity in the Triangular-Lattice Antiferromagnet Ba3CoSb2O9

We have measured the thermal conductivity in the ab-plane,

Thermal Diffuse Scattering in X-Ray Diffraction by Aluminium

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Thermal Conductivity and Annealing Effects in the Iron-Based Superconductor FeSe0.3Te0.7

ab, and along the c-axis,

Observation of the Thermal Conductivity due to Spins in the One-Dimensional Antiferromagnetic Ising-Like Spin System ACoX3 (A = Rb, Cs; X = Cl, Br)

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Magnetic State of the Geometrically Frustrated Quasi-One-Dimensional Spin System Cu3Mo2O9 Studied by Thermal Conductivity

c, of single crystals of the S = 1/2 triangular-lattice antiferromagnet Ba3CoSb2O9 in zero field and magnetic fields. In zero field, it has been found that both

Thermal Conductivity and Spin State of the Spin Diamond-Chain System Azurite Cu3(CO3)2(OH)2

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Study of Thermal Conductivity due to Spins in One-Dimensional Spin Systems AFeX3 (A=Rb, Cs; X=Cl, Br)

ab and

Thermal Conductivity of the S = 1/2 Quasi-One-Dimensional Ferromagnetic Spin System CsCuCl3

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Thermal Conductivity in the Frustrated Two-Leg Spin- Ladder System BiCu2PO6

c show a similar broad peak around 40 K, suggesting that the thermal conductivity due to phonons is dominant in this compound and that the mean free path of phonons is suppressed so much by strong magnetic-fluctuations due to the magnetic frustration. It has also been found that both