Atsuko FUKAYA

Postdoctoral Researcher



March 1997 Doctor of Science, Graduate School of Science, Ochanomizu University
Doctor thesis "Behavior under magnetic fields and spin dynamics of the random magnets -Insulating mixed compounds MnxMg1-xTiO3and FexMn1-xTiO3"


1997-2001 Postdoctoral Researcher, The Institute of Physical and Chemical Research (RIKEN)
2001-2002 Postdoctoral Researcher (JSPS fellow), Physics Department, Columbia University
2002-2003 Postdoctoral Researcher, Institute for Chemical Research, Kyoto University
2003-2004 Postdoctoral Researcher, Institute for Materials Research, Tohoku University
2005-2006 Research Assistant, Condensed Molecular Materials Laboratory, RIKEN
2006 to 2007 Postdoctoral Researcher, Condensed Molecular Materials Laboratory, RIKEN
May 2007 当研究室卒業


Structural studies of molecular conductors by X-ray diffraction technique

Methods
μSR
  muon spin relaxation
  muon spin resonance
  level crossing resonance		 Nuetron scattering
  elastic scattering		 Magnetization
  dc-magnetization
  ac-susceptibility
  high field magnetization
X-ray diffraction
  powder diffraction
  Laue method
  Single crystal x-ray diffraction		 Sample synthesis and growth of single crystal
  solid state reaction
  floating-zone method
  bridgeman
  slow-evaporation method

Previous Subjects

strongly correlated systems
  lightly diluted La2-xSrxCu1-yMyO4 (M=Zn, Ni, Co, Mn)
magnetic soliton lattice
    CuB2O4 and the impurity effects
frustrated spin systems (S=1/2 kagome lattice systems)
    (Cu,Zn)3V2O4(OH)2 2H2O
    Cu3Bi(SeO2)2O2X (X=Cl and Br)
quantum effects in low dimensional spin systems
     Haldane-gap system : NiC2O4 2MIz,H20, NENP
     spin-ladder system : (Cu1-xZnx)2(1,4-diazacycloheptane)2Cl2
     2D AF :  Cu3B2O6
     2D dimer:Cu2(BO3B)2
random magnets(spin-glass, random field effect)
     (M1,M2)TiO3  (M1,M2=Mn,Fe,Mg)
 

  1. A. Fukaya, I. Watanabe, K. Yamada, and K. Nagamine
    "Spin dynamics in a copper metaborate CuB2O4 studied by muon spin relaxation"
    J. Phys. Soc. Jpn., 75, 113705 (2006).


  2. A. T. Savici, A. Fukaya, I. M. Gat-Malureanu, T. Ito, P. L. Russo, Y. J. Uemura, C. R. Wiebe, P. P. Kyriakou, G. J. MacDougall, M. T. Rovers, G. M. Luke, K. M. Kojima, M. Goto, S. Uchida, R. Kadono, K. Yamada, S. Tajima, T. Masui, H. Eisaki, N. Kaneko, M. Greven, and G. D. Gu
    "Muon spin relaxation studies of magnetic-field-induced effects in high-T-c superconductors"
    Phys. Rev. Lett., 95, 157001 (2005).


  3. T. Ito, Y. Fudamoto, A. Fukaya, I. M. Gat-Malureanu, M. I. Larkin, P. L. Russo, A. Savici, Y. J. Uemura, K. Groves, R. Breslow, K. Hotehama and S. Yamanaka, P. Kyriakou, M. Rovers, G. M. Luke, and K. M. Kojima
    "Two-dimensional nature of uperconductivity in intercalated layered systems LixHfNCl and LixZrNCl: muon spin relaxation and magnetization measurements"
    Phys. Rev. B, 69, 134522 (2004).


  4. A. Keren, J. S. Gardner, G. Ehlers, A. Fukaya, E. Segal, and Y. J. Uemura
    "Dynamic properties of a diluted pyrochlore cooperative paramagnet (TbpY1-p)2Ti2O7"
    Phys. Rev. Lett., 92, 107204 (2004).


  5. A. Fukaya, Y. Fudamoto, I. M. Gat, T. Ito, M. I. Larkin, A. T. Savici, Y. J. Uemura, P. P. Kyriakou, G. M. Luke, M. T. Rovers, K. M. Kojima, A. Keren, M. Hanawa, and Z. Hiroi
    "Muon Spin Relaxation and Susceptibility Studies of the Pure and Diluted Spin 1/2 Kagom\'{e}-like Lattice system (CuxZn1-x)3V2O7(OH)2 2H2O"
    Phys. Rev. Lett., 91 207603 (2003).


  6. C. R. Wiebe, J. E. Greedan, P. P. Kyriakou, G. M. Luke, J. S. Gardner, A. Fukaya, I. M. Gat-Malureanu, P. L. Russo, A. T. Savici, and Y. J. Uemura
    "Frustration-driven spin freezing in the S=1/2 fcc perovskite Sr2MgReO6"
    Phys. Rev. B, 68 134410 (2003).


  7. I. M. Gat-Malureanu, A. Fukaya, M. I. Larkin, A. J. Millis, P. L. Russo, A. T. Savici, Y. J. Uemura, P. P. Kyriakou, G. M. Luke, C. R. Wiebe, Y. V. Sushuko, R. H. Heffner, D. E. MacLaughlin, D. Andreica, A. Schenck, G. M. Kalvius
    "Field dependence of muon spin relaxation rate in MnSi"
    Phys. Rev. Lett., 90, 157201 (2003).


  8. G. M. Luke, M. T. Rovers, A. Fukaya, I. M. Gat, M. I. Larkin, A. Savici, Y. J. Uemura, K. M. Kojima, P. M. Chaikin, I. J. Lee, and M. J. Naughton
    "Unconventional superconductivity in (TMTSF)2ClO4"
    Physica B, 326, 378-380 (2003).


  9. A. Fukaya, Y. Fudamoto, I. M. Gat, T. Ito, M. I. Larkin, A. T. Savici, Y. J. Uemura, P. P. Kyriakou, G. M. Luke, M. T. Rovers, H. Kageyama, and Y. Ueda
    "Spin dynamics in the two-dimensional spin system SrCu2(BO3)2"
    Physica B, 326, 446-449(2003).


  10. A. Fukaya, I. Watanabe, and K. Nagamine
    "Long-Range Order in a Copper Borate Cu3B2O6"
    J. Phys. Soc. Jpn., 70, 2868-2871 (2001).


  11. A. Fukaya, J. Satooka, A. Ito, K. Nakajima, K. Kakurai, K. Nishiyama, and K. Nagamine
    "Magnetic field dependence of spin-glass freezing temperature in a diluted antiferromagnet Mn0.55Mg0.45TiO3"
    J. Appl. Phys., 89, 7053-7055 (2001).


  12. A. Agui, M. Mizumaki, Y. Saitoh, T. Matsushita, T. Nakatani, A. Fukaya, and E. Torikai
    "Soft x-ray absorption spectra of ilmenite family"
    J. Syncrotron Rad., 8, 907-909 (2001).


  13. A. Fukaya, A. Ito, H. Aruga Katori, and T. Goto
    "Effects of Random Fields on the Phase Diagram in the Field--Temperature Plane of the Diluted Antiferromagnet MnxMg1-xTiO3"
    J. Phys. Soc. Jpn., 69, 3027-3039 (2000).


  14. W. Higemoto, H. Tanaka, I. Watanabe, S. Ohira, A. Fukaya, and K. Nagamine
    "Anomalous magnetic dependence of muon spin relaxation in S=1/2 double chain system KCuCl3 and TlCuCl3"
    Physica B, 289-290, 172-175 (2000).


  15. A. Fukaya, W. Higemoto, M. Hagiwara, and K. Nagamine
    "μSR study of a spin ladder system (Cu1-xZnx)2(1,4-diazacycloheptane)2Cl4"
    Physica B, 289-290, 189-193 (2000).


  16. A. Fukaya, I. Watanabe, S. Ohira, and K. Nagamine
    "Radio-frequency muon spin resonance of Haldane-gap systems, Ni(C2H8N2)2NO2(ClO4) and NiC2O4 2(2-methylimidazole)"
    Physica B, 289-290, 185-188 (2000).


  17. A. Ito, C. Uchikoshi, A. Fukaya, S. Morimoto, K. Nakajima, and K. Kakurai
    "Competing anisotropy origin hysteretic behavior of the mixed Ising-XY antiferromagnet Fe0.50Co0.50TiO3 in magnetic fields"
    J. Phys. Chem. Sol., 60, 1233-1235 (1999).


  18. A. Fukaya, A. Ito, K. Nakajima, and K. Kakurai
    "Neutron scattering study of the spin-glass Mn0.55Mg0.45TiO3 under magnetic fields"
    J. Phys. Chem. Sol., 60, 1245-1247 (1999).


  19. A. Fukaya, A. Ito, K. Nakajima, and K. Kakurai
    "Magnetic phase diagram of the diluted antiferromanget Mn0.81Mg0.19TiO3 in the field-temperature plane"
    J. Phys. Chem. Sol., 60, 1241-1243 (1999).


  20. J. Satooka, A. Fukaya, A. Ito, E. Torikai, K. Nishiyama, and K. Nagamine
    "Spin dynamics of the duluted antiferromagnet FexMg1-xTiO3 by muon spin relaxation method"
    Hyperfine Interactions, 120-121, 611-614 (1999).


  21. A. Fukaya, J. Satooka, A. Ito, E. Torikai, K. Nishiyama, and K. Nagamine
    "Spin dynamics of diluted antiferromagnetis MnxMg1-xTiO3 by μSR method"
    Hyperfine Interactions, 120-121, 615-618 (1999).


  22. A. Fukaya, S. Ohira, I. Watanabe, M. Hagiwara, and K. Nagamine
    "μSR study of a mixed compound NiC2O4 2(2-methylimidazole)x(H2O)1-x"
    Hyperfine Interactions, 120-121, 619-622 (1999).


  23. J. Satooka, A. Fukaya, A. Ito, E. Torikai, K. Nishiyama, and K. Nagamine
    "The Spin Dynamics of the Cluster-Glass Fe0.25Mg0.75TiO3 Probed by the Muon Spin Relaxation Method"
    Hyperfine Interactions, 104, 363-368 (1997).


  24. A. Fukaya, A. Ito, E. Torikai, K. Nishiyama, and K. Nagamine
    "Studies of the Diluted Antiferromagnets MnxMg1-xTiO3 with x=0.55 and 0.70 by Muon spin Relaxation Method"
    Hyperfine Interactions, 104, 287-292 (1997).


  25. A. Ito, C. Oyama, A. Fukaya, H. Kato, and S. Miura
    "Magnetization process of the mixed compound with exchange frustrations Fe0.65Mn0.35TiO3 and Fe0.50Mn0.50TiO3 - anomalous dependence on the sweep-rate of magnetic fields"
    J. Phys. Soc. Jpn., 66, 3636-3647 (1997).


  26. A. Ito, A. Fukaya, K. Fujii, and H. Kato
    "Anomalous Sweep-rate Dependence of the Magnetization Process of Two Mixed Compound FexMn1-xTiO3 with Exchange Frustrations"
    Advanced Research in High Field Laboratory for Superconducting Materials, A42, 295-302(1996).


  27. A. Fukaya, A. Ito, H. Aruga Katori, and T. Goto
    "Effect of Random Fields on the Phase Diagram of the Diluted Antiferromagnet Mn0.80Mg0.20TiO3 in the Field-Temperature Plane"
    J. Phys. Soc. Jpn., 64, 4557-4560 (1995).


  28. A. Tobo, A. Fukaya, A. Ito, and K. Motoya
    "Concentration-temperature phase diagram of the diluted antiferromagnet MnxMg1-xTiO3"
    J. Magn. and Magn. Mater., 140-144, 1537-1538 (1995).


  29. A. Fukaya, A. Tobo, A. Ito, H. Aruga Katori, and T. Goto
    "Spin-flop Transition of the Diluted Antiferromagnet MnxMg1-xTiO3"
    Physica B, 201, 88-90 (1994).