全実績

1.      学術論文

3-1)    K. Nishiyama, T. Mito, G. Pristáš, T. Koyama, K. Ueda, T. Kohara, S. Gabáni,
K. Flachbart, H. Fukazawa, Y. Kohori, N. Takeshita, N. Shitsevalova, and H. Ikeda
“High-pressure induced modifications in the hybridization gap of the intermediate-valence compound SmB₆” 
Phys. Rev. B, 93 (2011) 121111(R) 1-5. 査読有

3-2)    T. Koyama, Y. Maeda, K. Ueda, T. Mito, and H. Suigawara
“Nuclear Quadrupole Resonance Measurement of the Ferromagnetic Filled-Skutterudite Compound EuRu₄Sb₁₂”
J. Phys. Soc. Jpn., 84 (2015) 085001 1-2.　査読有

3-3)    N. Emi, R. Hamabata, D. Nakayama, T. Miki, T. Koyama, K. Ueda, T. Mito,
Y. Kohori, Y. Matsumoto, Y. Haga, E. Yamamoto, Z. Fisk, and N. Tsujii
“Magnetic and Electronic Properties of URu₂Si₂ Revealed by Comparison with
Nonmangetic References ThRu₂Si₂ and LaRu₂Si₂”
J. Phys. Soc. Jpn., 84 (2015) 063702 1-4.　査読有

3-4)    T. Koyama, T. Maruyama, K. Ueda, T. Mito, A. Mitsuda, M. Umeda, M. Sugishima,
and H. Wada
“Zero-field NMR and NQR studies of magnetically ordered state in charge-ordered EuPtP”
Phys. Rev. B, 91 (2011) 094419 1-4. 査読有

3-5)　T. Mito, K. Nishitani, T. Koyama, H. Muta, T. Maruyama, G. Pristáš, K. Ueda, T. Kohara,
A. Mitsuda, M. Sugishima, and H. Wada
“NMR studies of ordered stractuture and valence state inthe successive valence-transition system EuPtP”
Phys. Rev. B, 90 (2015) 195106 1-6.　 査読有

3-6)    T. Koyama, Y. Maeda, T. Yamazaki, K. Ueda, T. Mito, K. Kohara, T. Waki, Y. Tabata,
H. Tsunemi, M. Itoh, and H. Nakamura
“Normal and Superconducting Properties of the Noncentrosymmetric Mo₃Al₂C”
J. Phys. Soc. Jpn., 82 (2013) 073709 1-4.　査読有

3-7)    K. Nishiyama, T. Mito, G. Pristas, Y. Hara, T. Koyama, K. Ueda, T. Kohara, Y. Akahama,
S. Gabani, M. Reiffers, K. Flachbart,H. Fukazawa, Y. Kohori, N. Takeshita,
and N. Shitsevalova
“Pressure-induced localization of 4f electrons in the intermediate valence compound SmB₆”
J. Phys. Soc. Jpn., 82 (2013) 123707 1-4　査読有

3-8)     T. Mito, M. Hattori, G. Motoyama, Y. Sakai, T. Koyama, K. Ueda, T. Kohara,
M. Yokoyama, and H. Amitsuka
“Investigation of local symmetries in the hidden order phase of URu₂Si₂”
J. Phys. Soc. Jpn., 82 (2013) 123704 1-4.　 査読有

3-9)     T. Mito, H. Hara, T. Ishida, K. Nakagawara, T. Koyama, K. Ueda, T. Kohara, K. Ishida,
K. Matsubayashi, Y. Saiga, and Y. Uwatoko
“Microscopic Evidence of a Crossover to a Low-Temperature Intermediate Valence State in YbCo₂Zn₂₀”
J. Phys. Soc. Jpn., 82 (2013) 103704 1-4.　 査読有

3-10)        T. Mito, T. Koyama, K. Nakagawara, T. Ishida, K. Ueda, T. Kohara, K. Matsubayashi,

Y. Saiga, K. Munakata, Y. Uwatoko, M. Mizumaki, N. Kawamura, B. Idzikowski,
and M. Reiffers
“Mechanism of Field Induced Fermi Liquid State in Yb-Based Heavy-Fermion Compound: X-ray Absorption Spectroscopy and Nuclear Magnetic Resonance Studies of YbCo₂Zn₂₀”
J. Phys. Soc. Jpn., 81 (2012) 033706 1-4.　 査読有

3-11)      T. Koyama, Y. Ozaki, K. Ueda, T. Mito, T. Kohara, T. Waki, Y. Tabata, C. Michioka,
Y. Yoshimura, M.-T. Suzuki, and H. Nakamura
“Partial gap opening on the Fermi surface in the noncentrosymmetric superconductor Mo₃Al₂C”
Phys. Rev. B, 84 (2011) 212501 1-4.  査読有

3-12)      T. Koyama, K. Kanda, G. Motoyama, T. Mito, K. Ueda, T. Kohara, H. Nakamura,
and H. Harima
“Electron Correlations in the Superconductor Rh₁₇S₁₅ Studied by ¹⁰³Rh NMR
and Specific Heat Measurements”　
J. Phys. Soc. Jpn., 79 (2010) 114723 1-5.  査読有

3-13)      T. Koyama, H. Nakamura, T. Kohara, and Y. Takahashi
“Magnetization Process of Narrow-Gap Semiconductor FeSb₂”
J. Phys. Soc. Jpn., 79 (2010) 093704 1-4.  査読有

3-14)      S. Kambe, H. Chudo, Y. Tokunaga, T. Koyama, H. Sakai, T. U. Ito, K. Ninomiya,
W. Higemoto, T. Takesaka, T. Nishioka, and Y. Miyake
 “Evidence for Appearance of an Internal Field in the Ordered State of CeRu₂Al₁₀ by µ⁺SR”
J. Phys. Soc. Jpn., 79 (2010) 053708 1-3.  査読有

3-15)      T. Koyama, H. Yamashita, T. Kohara, Y. Tabata, and H. Nakamura
“Structural transition in the normal state of the superconductor Mo₃Sb₇”
Materials Research Bulletin, 44 (2009) 1132-1135.  査読有

3-16)  T. Koyama, H. Yamashita, Y. Takahashi, T. Kohara, I. Watanabe, Y. Tabata,
and H. Nakamura          
“Frustration-Induced Valence Bond Crystal ans Its Melting in Mo₃Sb₇”
Phys. Rev. Lett., 101 (2008) 126404 1-4.  査読有

3-17)     T. Koyama, Y. Fukui, Y. Muro, T. Nagao, H. Nakamura, and T. Kohara
“Nuclear quadrupole resonance study of the electronic properties of the narrow-gap semiconductor FeSb₂”
Phys. Rev. B, 76 (2007) 073203 1-4.　 査読有

3-18)     T. Mito, M. Nakamura, M. Otani, T. Koyama, S. Wada, M. Ishizuka, M. K. Forthaus,
R. Lengsdorf, M. M. Abb-Elmeguid, and J. L. Sarrao
“Magnetic properties of the pressurc-induced ordering state in YbInCu₄ investigated with NMR, magnetization, and x-ray diffraction measurements”
Phys. Rev. B, 75 (2007) 134401 1-6.　 査読有

3-19)     T. Koyama, M. Nakamura, T. Mito, S. Wada and J. L. Sarrao
“Competition between the valence transition and magnetic ordering in YbInCu₄ probed
by ⁶³Cu-NQR and ¹¹⁵In-NMR at high pressures”
Phys. Rev. B, 71 (2005) 184437 1-5.　 査読有

3-20)     H. Nakamura, Y. Muro, S. Giri, J. Umemura, H. Kobayashi, T. Koyama, and T. Kohara
“Quasi-One-Dimensional Itinerant Electron System (La–Y)Mn₄Al₈ with Soft Spin Gap”
J. Phys. Soc. Jpn., 74 (2005) 2421-2424.　 査読有

3-21)     A. Yamamoto, J. Takeda, T. Koyama, T. Mito, S. Wada I. Shirotani, and C. Sekine
“Evidence for an antiferroquadrupolar ordering in YbSb probed by ¹²¹Sb and ¹²³Sb nuclear magnetic resonance”
Phys. Rev. B, 70 (2004) 220402 1-4.　 査読有

3-22)     T. Mito, T. Koyama, M. Shimoide, S. Wada, T. Muramatsu, T. C. Kobayashi,
and J. L. Sarrao
“Magnetic ordering in the pressure-stabilized high-temperature phase of YbInCu₄”
Phys. Rev. B, 67 (2003) 224409 1-5.　 査読有

3-23)     A. Yamamoto, T. Koyama, T. Mito, S. Wada, R. A. Fisher, N. E. Phillips, Z-P. Wang,
and D. C. Johnston
“Magnetic properties of copper cluster-spins in BaCuO_2+x (x = 0 and 0.14), investigated
by magnetization and nuclear magnetic resonance measurements”
J. Phys. C, Condensed matter, 15 (2003) 8587-8598.　 査読有

3-24)  H. Ishida, T. Koyama, T. Mito, S. Wada, and Y. Ishihara:
“Peierls transition in quasi-one-dimensional conductor Nb₃Te₄ and the effect of metal-atom intercalation, investigated by ⁹³Nb magnetic resonance”
J. Phys. C, Condensed matter, 14 (2002) 7503-7512.　 査読有

3-25)  T. Koyama, M. Matsumoto, T. Tanaka, H. Ishida, T. Mito, S. Wada, and J. L. Sarrao
“Physical properties of the dense Kondo compounds YbXCu₄ (X = Au, Ag, In, Cd, Tl, and Mg) probed by ⁶³Cu NMR”
Phys. Rev. B, 66 (2002) 014420 1-8.　 査読有

3-26)  T. Koyama, M Matsumoto, S. Wada, and J. L. Sarrao
“¹⁷¹Yb and ⁶³Cu magnetic resonance studies on the fluctuation valent compound YbInCu₄”
Phys. Rev. B, 63 (2001) 172410 1-4.　 査読有

3-27)  T. Koyama, M. Matsumoto, S. Wada, Y. Muro, and M. Ishikawa
“Combination of Dense Kondo Effect and RKKY Interaction in CeCuSb₂ Investigated by NMR”
J. Phys. Soc. Jpn., 70 (2001) 3667-3672. 査読有

3-28)  T. Koyama, H. Sugita, S. Wada, and K. Tsutsumi
“NMR investigation of the electric state in a ternary superconductor Sc₅Co₄Si₅”
J. Phys. Soc. Jpn., 68 (1999) 2326-2330. 査読有

2.      国際学会 Proceedings

4-1)       T. Koyama, H. Yamada, K. Ueda, T. Mito, Y. Aoyama, T. Nakano and N. Takeda
“NMR studies on polyphosphide Ce₆Ni₆P₁₇”
J. Phys. Conf. Series, 683 (2016) 01202. 査読有

4-2)        T. Koyama, H. Yamada, K. Ueda, T. Mito and Y. Haga
“NMR study of black-phase in SmS”
J. Phys. Conf. Series, 592 (2015) 012027. 査読有

4-3)   Y. Kawasaki, R. Morioka, Y. Kishimoto, K. Nakamura, K. Nishiyama, T. Koyama, T. Mito, T. Baba, T. Yamauchi, M. Isobe and Y. Ueda
“⁵⁴V-NMR study of low temperature phase in δ-Ag_2/3V₂O₅”
J. Phys. Conf. Series, 592 (2015) 012042. 査読有

4-4)        T. Koyama, H. Yamada, T. Shimosaka, H. Hara, K. Ueda, T. Mito, T. Kohara,
and A. Ślebarski
“Sb NQR Study in Kondo Insulator CeRh_1−xPd_xSb System”
J. Phys. Soc. Conf. Proc. 3 (2014) 011020. 査読有

4-5)        T. Mito, H. Hara, T. Ishida, K. Nakagawara, T. Koyama, K. Ueda, T. Kohara, K. Ishida,
K. Matsubayashi, Y. Saiga, and Y. Uwatoko
“Low-Temperature Intermediate Valence State in YbCo₂Zn₂₀”
J. Phys. Soc. Conf. Proc. 3 (2014) 011065. 査読有

4-6)        K. Nishiyama, T. Mito, G. Pristáš, Y. Hara, T. Koyama, K. Ueda, T. Kohara, Y. Akahama,
S. Gabáni, M. Reiffers, K. Flachbart, H. Fukazawa, Y. Kohori, N. Takeshita,
and N. Shitsevalova
“NMR Investigation of Pressure Effect on Intermediate Valence Compound SmB₆”
J. Phys. Soc. Conf. Proc. 3 (2014) 01108565. 査読有

4-7)   K. Ueda, T. Koyama, T. Mito, and T. Kohara
“NMR Studies of Quasi-One-Dimensional Compound Lu₂Ir₃Si₅”
J. Phys. Soc. Conf. Proc. 3 (2014) 015025. 査読有

4-8)   T. Koyama, K. Sugiura, K. Ueda, T. Mito, T. Kohara, R. Satoh. K. Tsuchiya, T. Nakano,
and N. Takeda
“Intermediate Valence Behavior of Yb₂Ni₁₂P₇ Studied by Using ³¹P NMR”
Journal of Korean Physical Society 63 (2013) 416-419. 査読有

4-9)   K. Nishiyama, T. Mito, K. Ueda, T. Koyama, T. Kohara, G. Pristáš, S. Gabáni, M. Reiffers, K. Flachbart, Y. Komaki, M. Kokubu, H. Fukazawa, Y. Kohori, N. Takeshita,
and N. Shitsevalova
“Effect of pressure on the intermediate-valence semiconductor SmB₆: ¹¹B-NMR”
Journal of Korean Physical Society 63 (2013) 2024-2027. 査読有

4-10)    T. Koyama, Y. Ozaki, K. Ueda, T. Mito, T. Kohara, T. Waki, Y. Tabata, C. Michioka,
Y. Yoshimura, M.-T. Suzuki, and H. Nakamura
“Observation of the partial Fermi Surface Quenching in the Noncentrosymmetric Superconductor Mo₃Al₂C”
J. Phys. Soc. Jpn., 81 (2012) Suppl. B SB008 1-5. 査読有

4-11)    T. Koyama, Y. Ozaki, K. Ueda, T. Mito, T. Kohara, T. Waki, Y. Tabata, and H. Nakamura
“Phase transition in the normal state of the non-centrosymmetric superconductor Mo₃Al₂C”
J. Phys. Conf. Series, 391 (2012) 012097 1-4. 査読有

4-12)    K. Nishiyama, T. Mito, Y. Kujirai, T. Koyama, K. Ueda, T. Kohara, K. Takeuchi, H. Akutsu,  J. Yamada, A. Kornilov, V. M. Pudalov, and J. S. Qualls
“⁷⁷Se-NMR study of quasi-one dimensional organic conductor (TMTSF)₂X”
J. Phys. Conf. Series, 344 (2012) 012026 1-4. 査読有

4-13)    T. Koyama, M. Abe, T. Mito, K. Ueda, T. Kohara, and H. S. Suzuki
“NMR study of half-Heusler type compounds YbPtSb and LuPtSb”
J. Phys. Soc. Jpn., 80 (2011) Suppl. SA097 1-3.  査読有

4-14)    T. Mito, M. Hattori, G. Motoyama, H. Sakai, T. Koyama, K. Ueda, T. Kohara,
M. Yokoyama, and H. Amitsuka
“⁷³Ge-NMR Investigation of the Hidden Order in URu₂Si₂"
J. Phys. Soc. Jpn., 80 (2011) Suppl. SA016 1-3. 査読有

4-15)    H. Nakamura, S. Terazawa, T. Waki, Y. Tabata, T. Koyama, and T. Kohara
“Geometric Frustration in Itinerant Electron Magnets"
AIP Conf. Proc., 1347 (2011) 238-243. 査読有

4-16)    T. Koyama, M. Abe, T. Mito, K. Ueda, T. Kohara, and H. S. Suzuki
“NMR study in the half-Heusler type compound YbPtSb"
J. Phys. Conf. Series, 273 (2011) 012040 1-4. 査読有

4-17)    T. Koyama, K. Kanda, G. Motoyama, K. Ueda, T. Mito, T. Kohara, and H. Nakamura
“¹⁰³Rh NMR investigation of the superconductor Rh₁₇S₁₅”
Physica C, 470 (2010) S734-S735. 査読有

4-18)    K. Ueda, T. Koyama, and T. Kohara
“Nuclear magnetic resonance study of some Ce-based superconductors
with noncentrosymmetric crystal structure”   
J. Appl. Phys., 107 (2010) 09E139 1-3. 査読有

4-19)    T. Koyama, K. Kanda, K. Ueda, T. Mito, K. Kohara, and H. Nakamura
“¹⁰³Rh NMR studies in the superconductor Rh₁₇S₁₅”
J. Phys., Conf. Series, 200 (2010) 012095 1-4. 査読有

4-20)    T. Mito, T. Koyama, K. Nakagawara, T. Ishida, K. Ueda, T. Kohara, K. Matsubayashi,
Y. Saiga, K. Munakata, Y. Uwatoko, M. Mizumaki, and N. Kawamura
“Magnetic Field Effect On Yb-based Heavy Fermions Near Magnetic-nonmagnetic Transition”
Acta Physica Polonica A, 108 (2010) 870-872. 査読有

4-21)    T. Mito, K. Nishiyama, T. Koyama, K. Ueda, T. Kohara, K. Takeuchi, H. Akutsu, J. Yamada,
A. Kornilov, V.M. Pudalov, and J.S. Qualls　
“⁷⁷Se NMR study of nonmagnetic–magnetic transition in (TMTSF)₂X”
Physica C, 470 (2010) S592-S593. 査読有

4-22)    Y. Tabata, T. Koyama, T. Kohara, I. Watanabe, and H. Nakamura
“Structural transition in Mo₃Sb₇ probed by muon spin relaxation”
Physica B, 404 (2009) 746-768. 査読有

4-23)    T. Mito, M. Otani, M. Nakamura, T. Koyama, S. Wada, H. Kotegawa, T. C. Kobayashi,
B. Idzikowski, M. Reiffers, and J. L. Sarrao 
“Pressure Effect on Yb-Based Strongly Correlated Electron System”
Acta Physica Polonica, A 115 (2009) 47-52. 査読有

4-24)    K. Ueda, T. Koyama, K. Hamamoto, T. Kohara, G. Motoyama, and Y. Oda
“NMR study of Heavy Fermion Superconductor CePt₃Si”
J. Appl. Phys., 99 (2006) 08M511-513. 査読有

4-25)    T. Mito, M. Nakamura, M. Shimoide, M. Otani, T. Koyama, S. Wada, H. Kotegawa,
T. C. Kobarashi, B. Idzikowski, M. Reiffers, and J. L. Sarrao
“Pressure effect on heavy fermion compound YbCu₅”
Physica B, 378-380 (2006) 732-733. 査読有

4-26)    T. Koyama, M. Nakamura, T. Mito, S. Wada, and J. L. Sarrao
“Valence and magnetic transitions in YbInCu₄ probed using ⁶³Cu nuclear quadrupole resonance under high pressure”
J. Phys.: Condens. Matter, 17 (2005) S901-S904. 査読有

4-27)    T. Koyama, M. Nakamura, T. Mito, S. Wada, and J. L. Sarrao
“Investigation of pressurc-induced magnetic ordering in YbInCu₄ probed microscopically
by ⁶³Cu NQR”
Physica B, 359-361 (2005) 232. 査読有

4-28)    T. Mito, M. Shimoide, T. Koyama, M. Nakamura, S. Wada and M. Reiffers, B. Idzikowski,
J. L. Sarrao, and T. C. Kobayashi
“Pressure effect on the magnetic properties in YbXCu₄ (X=In and Cu)”
J. Mang. Mang. Mater., 290-291 (2005) 405-407. 査読有

4-29)    T. Koyama, T. Mito, S. Wada and J. L. Sarrao
“Pressure effect on YbInCu₄ investigated with ⁶³Cu NQR”
J. Mang. Mang. Mater., 272-276, Suppl. 1, (2004) E43-E44. 査読有

4-30)    T. Mito T. Koyama, S. Wada, T. Muramatsu, T. C. Kobayashi, and J. L. Sarrao
“Evidence for the pressure induced magnetic ordering in YbInCu₄”
J. Mag. Mag. Mater., 272-276 Suppl.1, (2004) E47-E48. 査読有

4-31)    T. Koyama, T. Mito, S. Wada, and J. L. Sarrao :
“Spin fluctuations in heavy-Fermion compounds YbZnCu₄ and YbAuCu₄, investigated
by ⁶³Cu NMR/NQR”
Physica B, 329-333 (2003) 555-556. 査読有

4-32)    S. Wada, T. Mito, T. Koyama, T. Muramatsu, T. C. Kobayashi, and J. L. Sarrao
“Transport, AC-Susceptibility and PQR Measurements of Strongly Electron Correlated Compound YbInCu₄ at High Pressures”
Int. J. Mod. Phys. B, 17 (2003) 3661-3663. 査読有

4-33)    T. Koyama, H. Sugita, S. Wada, K. Miyatani, T. Tanaka, and M. Ishikawa
“An evidence for a spin gap in copper thiospinel CuTi₂S₄”
Physica B, 284 (2000) 1513-1514. 査読有

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