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Study of structural transition and molecular motion on Clathrate Ag 6 O 8 AgNO 3

Study of structural transition and molecular motion on Clathrate Ag 6 O 8 AgNO 3. Kitaoka Lab. Hirofumi Naruwa. Ref.) K. Kawashima et al ., J. Phys. Soc. Jpn. 77 (2008) 024707 F. Kanetake, H. Naruwa et al ., unpublished. Contents. Contents. ・ Introduction Cage compounds

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Study of structural transition and molecular motion on Clathrate Ag 6 O 8 AgNO 3

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  1. Study of structural transition and molecular motion on Clathrate Ag6O8AgNO3 Kitaoka Lab. Hirofumi Naruwa Ref.) K. Kawashima et al., J. Phys. Soc. Jpn. 77 (2008)024707 F. Kanetake, H. Naruwa et al., unpublished

  2. Contents Contents ・Introduction Cage compounds Crystal structure of Ag6O8AgNO3 Superconducting property ・Experimental results & discussion Basic physical properties Map of charge density NMR~Nuclear Magnetic Resonance~ 14N-NMR spectrum ・Summary

  3. Cage compounds Si Introduction Fullerene compounds involving metalic atom Silicon clathrate compounds ・Cage compounds havePolyhedral cages and guest molecules inside the cages. ・Guest molecules influence the physical properties very much. 多面体の

  4. Crystal structure of Ag6O8AgNO3 Introduction NO3 Ag cage Ag6O8

  5. Superconducting property O F B Ｎ F O F O Introduction Ag6O8AgNO3 Ag6O8AgHF2 Ag6O8AgBF3 Ag6O8cage Ag6O8cage Ag6O8cage HF2 NO3 H BF3 F F Tc=1.04K Tc=1.38K Tc=0.3K the superconducting property is affected by the presence of molecules inside the cages K. Kawashima et. al., JPSJ

  6. Cooper-pair Superconductivity is caused by the formation of Cooper-pairs. Ag6O8AgNO3 ？ ━ study the moleculer dynamics of this compound

  7. Tc=1.04K (a) Resistivity: 90 K & 185 K. (b) Specific heat: 90 K & 185 K. (c) Magnetic susceptibility: 185 K. Results and Discussion Basic physical properties Experimental results & discussion □Ag6O8AgNO3 ・ The electrical resistivity shows the metallic conductivity. ・ Ag6O8AgNO3 exhibits kinksat around 90 K and 185 K. 90K 185K XRD suggests structural phase transition in 185K . K. Kawashima et. al., JPSJ

  8. map of charge density O O N N O O O O Experimental results & discussion Contour map (high: green → blue → red: low) 300K 120K cross section view charge density exists around N ion. The movement of NO3 is limited. ⇒NO3ion rotate in Ag6O8 cage. K. Kawashima et. al., JPSJ

  9. NMR~Nuclear Magnetic Resonance~ ⊿E = hγH = hω Experimental results & discussion I = 1 -1 -1 ±1,0 H ＋ Energy 0 0 +1 +1 electric field gradient ω=γ H Zeeman splitting nuclear quadrupole interaction ＋ ＋ ±1 ±1,0 electric field gradient ω ω ＋ ＋ atom core 0

  10. 14N-NMR spectrum NO3 Ag6O8 cage NO3 210K,190K Ag6O8 cage Experimental results & discussion Experimental results & discussion 170K,150K 210K,190K Energy ⊿E = hγH = hω 170K,150K internal electric field gradient ⇒Structural-phase transition in 185K F. Kanetake, H. Naruwa et. al., JPSJ

  11. Summary Summary ・Structural-phase transition occurs in 185K. ・The molecular motion of NO3 ion is confined in the lower dimension due to thedistortion of cage at 185K. ・We can’t figure out 90K transition for absence of data. We will reveal interesting property attributed to cages and guests by site selective NMR.

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