"Effect of Hydrostatic Pressure on Magnetic States and Transitions in Layered Metal Oxides NaxCoO2 and Srn+1RunO3n+1"
Prof. Yuri Sushko

Sep 17, 2004


講演題目: Effect of Hydrostatic Pressure on Magnetic States and Transitions in Layered Metal Oxides NaxCoO2 and Srn+1RunO3n+1
講 師 : Prof. Yuri Sushko
     (Department of Physics & Astronomy University of Kentucky)
日 時 : 平成16年9月17日 (金) 11:00-
場 所 : 北海道大学大学院理学研究科物理学専攻 大学院講義室 理学部2号館(2-11号室)

要 旨 :
   Unconventional superconductivity, itinerant and localized moment magnetism, magnetic-field-dependent metal-insulator transitions are notorious characteristic features of transition-metal oxides, such as cuprates, manganates, ruthenates, cobaltates. Since pressure P is one of the main thermodynamic parameters, similar to temperature and magnetic field, an external pressure is often used to tune the phase transitions of interest.
   In this talk, I will introduce the method of high-resolution SQUID magnetometry under hydrostatic (He-gas) pressure and its application to the studies of effects of pressure on magnetic states and transitions in correlated electron materials with layered structure. The results on two groups of transition metal oxides will be presented: (1) the metallic ruthenates Sr3Ru2O7 and Sr4Ru3O10 with perovskite-derived structure, and (2) the cobalt oxide superconductor Na0.35CoO2・1.4H2O and its parent compound Na0.75CoO2. The observed high-pressure effects will be discussed in relation to the specifics of a crystal structure comprising weakly bound two-dimensional MO2 (M = Ru, Co) sheets, the property responsible for a strongly anisotropic character of the electron system of the materials under investigation.

世話人  河本 充司
(atkawa@phys.sci.hokudai.ac.jp)
北海道大学大学院理学研究科

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