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A. X-ray magnetic circular dichroism of metal
thin films  top
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"Temperature dependent MCXD measurements
of thin Ni films on Cu(100)"
M. Tischer, D. Arvanitis, T. Yokoyama, T. Lederer, L. Troeger and K. Baberschke,
Surf. Sci. 307-309 (1994) 1096-1101.
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"Observation of O K-edge X-ray magnetic
circular dichroism of CO absorbed on an ultrathin
Co/Cu(001) film"
K. Amemiya, T. Yokoyama, Y. Yonamoto, M. Miyachi, Y. Kitajima and
T. Ohta, Jpn. J. Appl. Phys. Express Letter 39 (2000) L63-L65.
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"K-edge magnetic circular dichroism of O in
CO/Ni/Cu(001): Dependence on substrate magnetic
anisotropy and its interpretation"
T. Yokoyama, K. Amemiya, M. Miyachi, Y. Yonamoto, D.
Matsumura and T. Ohta, Phys. Rev. B62 (2000) 14191-14196.
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"Magnetism of an ultrathin Mn Film on
Co(100) and the effect of oxidation studied
by x-ray magnetic circular dichroism"
Y. Yonamoto, T. Yokoyama, K. Amemiya, D. Matsumura and T. Ohta, Phys. Rev. B63 (2001) 214406 (7 pages).
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"Anisotropic magnetization of CO adsorbed
on ferromagnetic metal thin films studied
by x-ray magnetic circular dichroism"
T. Yokoyama, K. Amemiya, Y. Yonamoto, D. Matsumura and
T. Ohta, J. Electron Spectrosc. Relat. Phenom. 119 (2001) 207-214.
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"O K-edge x-ray magnetic circular dichroism
of atomic O adsorbed on an ultrathin Co/Cu(100)
films: Comparison with molecular CO on Co/Cu(100)"
K. Amemiya, T. Yokoyama, Y. Yonamoto, D. Matsumura and T. Ohta,
Phys. Rev. B64 (2001) 132405 (4 pages).
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"Magnetic interaction between adsorbed
NO and fcc Co(001) thin films studied by
X-ray magnetic circular dichroism"
Y. Yonamoto, T. Yokoyama, K. Amemiya, D. Matsumura, S. Kitagawa,
Y. Hamada, T. Koide and T. Ohta, J. Phys. Soc. Jpn. 71 (2002) 607-612.
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"X-ray magnetic circular dichroism study
on spin reorientation transition of magnetic
thin films induced by surface chemisorption"
D. Matsumura, T. Yokoyama, K. Amemiya, S. Kitagawa, and T. Ohta, Phys. Rev. 66 (2002) 024402 (6 pages).
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"Spin reorientation transitions of ultrathin
Co/Pd(111) films induced by chemisorption:
x-ray magnetic circular dichroism study”
T. Yokoyama, D. Matsumura, K. Amemiya, S. Kitagawa,
N. Suzuki and T. Ohta, J.Phys. Condens. Matter 15 (2003) S537-S546.
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"Development of a depth-resolved x-ray
magnetic circular dichroism: application
to Fe/Cu(100) ultrathin films”
K. Amemiya, S. Kitagawa, D. Matsumura, T. Yokoyama and T. Ohta, J.Phys. Condens. Matter 15 (2003) S561-S572.
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B. Local structures of magnetic materials
studied by XAFS top
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"Characterization of magnetic materials
of CoFe cyanides by x-ray-absorption fine-structure
spectroscopy"
T. Yokoyama, T. Ohta, O. Sato and K. Hashimoto, Phys. Rev. B58 (1998) 8257-8266.
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"Spin-crossover phase transition of
a chain Fe(II) complex studied by x-ray-absorption
fine-structure spectroscopy"
T. Yokoyama, Y. Murakami, M. Kiguchi, T. Komatsu and
N. Kojima, Phys. Rev. B58 (1998) 14238-14244.
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"Local structure of a trapped photo-excited
state of a FeCo cyanide studied by x-ray-absorption
fine structure spectroscopy"
T. Yokoyama, M. Kiguchi, T. Ohta, O. Sato, Y. Einaga
and K. Hashimoto, Phys. Rev. B60 (1999) 9340-9346.
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"Characterization of relaxed photo-excited
magnetized states in prussian-blue analogous
magnets"
T. Yokoyama, K. Okamoto, D. Matsumura, T. Ohta, S. Ohkoshi
and K. Hashimoto, J. Synchrotron Radiat. 8 Part 2 (2001) 913-915.
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"Photo-induced magnetized state of Co(DTBSQ)(DTBCat)(phen)C6H5CH3 studied by X-ray absorption spectroscopy"
T. Yokoyama, K. Okamoto, K. Nagai, T. Ohta, S. Hayami,
Z.-Z. Gu, R. Nakajima and O. Sato, Chem. Phys. Lett. 345 (2001) 272-276
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"Local structure and electronic state
of the photomagnetic material CoW cyanide
studied by x-ray-absorption fine-structure
spectroscopy"
T. Yokoyama, K. Okamoto, T. Ohta, S. Ohkoshi and K.
Hashimoto, Phys. Rev. B65 (2002) 064438 (8 pages). |
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"Photoinduced phase transition of RbMnFe(CN)6 studied by x-ray-absorption fine structure
spectroscopy”
T. Yokoyama, H. Tokoro, S. Ohkoshi, K. Hashimoto, K.
Okamoto and T. Ohta, Phys. Rev. B66 (2002) 184111 (10 pages).
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“Metastable photoinduced phase of Cu(II)
ethylenediamine complexes studied by x-ray-absorption
fine-structure spectroscopy”
T. Yokoyama, K. Takahashi and O. Sato, Phys. Rev. B67 (2003) 172104 (4 pages).
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C. Anharmonic vibrations of molecules and
solids observed with EXAFS
: Quantum-statistical theories top
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"Anharmonic interatomic potentials of
metals and metal bromides determined by EXAFS"
T. Yokoyama, T. Satsukawa and T. Ohta, Jpn. J. Appl. Phys. 28 (1989) 1905-1908.
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"Anharmonic interatomic potentials of
diatomic and linear triatomic molecules studied
by extended x-ray-absorption fine structure"
T. Yokoyama, K. Kobayashi, T. Ohta and A. Ugawa, Phys. Rev. B53 (1996) 6111-6122.
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"Anharmonic interatomic potentials of
octahedral Pt halogen complexes studied by
extended x-ray-absorption fine structure"
T. Yokoyama, Y. Yonamoto, T. Ohta and A. Ugawa, Phys. Rev. B54 (1996) 6921-6928.
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"Anharmonicity of the bending and stretching
vibrations observed in extended x-ray absorption
fine structure of tetrahedral molecules"
T. Yokoyama, Y. Yonamoto and T. Ohta, J. Phys. Soc. Jpn. 65 (1996) 3901-3908.
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"Thermal expansion and anharmonicity
of solid Kr studied by extended x-ray-absorption
fine structure"
T. Yokoyama, T. Ohta and H. Sato, Phys. Rev. B55 (1997) 11320-11329. |
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"Path integral effective potential method
applied to extended x-ray-absorption fine
structure cumulants"
T. Yokoyama, Phys. Rev. B57 (1998) 3423-3432. |
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"Path-integral effective-potential theory
for EXAFS cumulants compared to the second-order
perturbation"
T. Yokoyama, J. Synchrotron Rad. 6 (1999) 323-325.
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"Path-integral approach to anharmonic
vibration of solids and solid interfaces"
T. Yokoyama, J. Synchrotron Radiat. 8 Part 2 (2001) 87-91. |
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D. Anharmonic vibrations of solids, solid
surfaces and clusters observed with EXAFS
: Experimental studies top
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"Temperature dependence of the Pt LIII-edge EXAFS of platinum clusters supported
on NaY-zeolite"
T. Yokoyama, N. Kosugi, K. Asakura, Y. Iwasawa and H.
Kuroda, J. Phys. (Paris) 47 (1986) C8 273-276.
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"Temperature-dependent extended x-ray-absorption
fine structure study on supported silver
and palladium clusters: comparison of their
interatomic potentials with those of bulk
metals"
T. Yokoyama and T. Ohta, Jpn. J. Appl. Phys. 29 (1990) 2052-2058.
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"Vibrational and anharmonic properties
of the surface S-Ni bonds in c(2× 2)S/Ni(100)
and c(2× 2)S/Ni(110) from the SEXAFS
point of view"
T. Yokoyama, H. Hamamatsu, Y. Kitajima, Y. Takata, S.
Yagi and T. Ohta, Surf. Sci. 313 (1994) 197-208.
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"Coverage dependence of surface structure
and vibration of Cl/Cu(100) compared to Cl/Cu(100)"
M. Kiguchi, T. Yokoyama, S. Terada, M. Sakano, Y. Okamoto, T. Ohta,
Y. Kitajima and H. Kuroda, Phys. Rev. B56 (1997) 1561-1567. |
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"Coverage dependence of surface structures
and vibrations of Cl/Ni(100) studied by Cl
K-edge SEXAFS"
T. Yokoyama, S. Terada, Y. Okamoto, M. Sakano, T. Ohta,
Y. Kitajima, M. Tischer and K. Baberschke,
Surf. Sci. 374 (1997) 243-250. |
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"Surface structures and thermal vibrations
of Ni and Cu thin films studied by extended
x-ray-absorption fine structure"
M. Kiguchi, T. Yokoyama, D. Matsumura, H. Kondoh, O. Endo, T. Ohta,
Phys. Rev. B61 (2000) 14020-14027.
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E. Surface structure of atomic and molecular
adsorbates studied by XAFS top
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"Surface relaxation in c(2× 2)Cl/Ni(100)
determined by the soft x-ray standing-wave
method combined with surface-extended x-ray-absorption
fine-structure spectroscopy"
T. Yokoyama, Y. Takata, T. Ohta, M. Funabashi, Y. Kitajima
and H. Kuroda, Phys. Rev. B42 (1990) 7000-7005.
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"Thiophenol adsorption on Ni(100) studied
by S K-edge EXAFS and XANES"
Y. Takata, T. Yokoyama, S. Yagi, N. Happo, H. Sato, K. Seki, T.
Ohta, Y. Kitajima and H. Kuroda, Surf. Sci. 259 (1991) 266-274. |
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"Site selective adsorption of Cl atoms
on Ni(111) studied by back-reflection x-ray
standing-wave method"
Y. Takata, H. Sato, S. Yagi, T. Yokoyama, T. Ohta and Y. Kitajima, Surf. Sci. 265 (1992) 111-117.
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"The adsorption of oxygen on Cu(100),
II: molecular adsorption and dissociation
by means of O K-edge x-ray absorption fine
structure"
T. Yokoyama, D. Arvanitis, T. Lederer, M. Tischer, L.
Troeger, K. Baberschke and G. Comelli, Phys. Rev. B48 (1993) 15405-15416.
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"Surface structures and electronic properties
of SO2 adsorbed on Ni(111) and Ni(100) studied
by S K-edge X-ray absorption fine structure
spectroscopy"
T. Yokoyama, S. Terada, S. Yagi, A. Imanishi, S. Takenaka,
Y. Kitajima and T. Ohta, Surf. Sci. 324 (1995) 25-34. |
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"Interface structure of alkali-halide
heteroexpitaxial films studied by x-ray-absorption
fine structure spectroscopy"
M. Kiguchi, T. Yokoyama, D. Matsumura, H. Kondoh, T. Ohta and Y.
Kitajima, Phys. Rev. B60 (1999) 16205-16210
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"SO2 adsorption on thin Pd/Ni(111) films studied
by x-ray-absorption fine-structure spectroscopy"
S. Terada, T. Yokoyama, Y. Okamoto, M. Kiguchi, Y. Kitajima and
T. Ohta, Surf. Sci. 442 (1999) 141-148.
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F. Other XAFS studies top
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"Polarized XANES spectra of CuCl22H2O. Further evidence of shake-down phenomena"
T. Yokoyama, N. Kosugi and H. Kuroda, Chem. Phys. 103 (1986) 101-109.
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"X-ray absorption spectra of poly-p-phenylenes and polyacenes: localization
of pi* orbitals"
T. Yokoyama, K. Seki, I. Morisada, K. Edamatsu and T.
Ohta, Phys. Script. 41 (1990) 189-192.
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"Temperature-dependent Br K-edge EXAFS
study on AgBrxCl1-x solid solutions"
T. Yokoyama, F. Takamatsu, K. Seki, K. Miyake, T. Tani
and T. Ohta, Jpn. J. Appl. Phys. 29 (1990) L1486-L1489. |
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