121.　Crystal structure and properties of phosphate PbCu2 (PO4) 2 with spin-singlet ground state
A. A. Belik, M. Azuma, A. Matsuo, T. Kaji, S. Okubo, H. Ohta, K. Kindo and M. Takano
Phys. Rev. B 73 (2006)024429/1-7.

122.　High Field ESR Study of Three Dimensional Spin Frustrated System MgCr2O4
M. Yoshida, T. Hirano, Y. Inagaki, S. Okubo, H. Ohta, H. Kikuchi, I. Kagomiya,M. Toki and K. Kohn
J. Phys. Soc. Jpn. 75 (2006) 0447091/1-4.

123.　Quntum critical behavior induced by Mn impurity in CuGeO3
A. V. Semeno, N. E. Sluchanko, N. A. Samrin, A. A. Pronin, H. Ohta, S. Okubo, S. V. Demishev
Physica B 378-380 (2006) 115-116.

124.　High field ESR study of frustrated spinel system LiCrTiO4
H. Ohta, S. Okubo S. Ono and H. Kikuchi
phys. Stat. Sol. (c) 3(8) (2006) 2816-2819"

125.　High frequency ESR measurements of one-dimensional edge-sharing CuO2 chain system Ca2Y2Cu5O10
S. Okubo, K. Kawakami, M. Yoshida and H. Ohta
Phys. Stat. Sol. ( c) 3(8) (2006) 2828-2831.

126.　High frequency ESR measurements of high pressure phase SiCo2O4
W. Zhang, S. Okubo, H. Ohta, T. Saito and M. Takano
Phys. Stat. Sol. (c) 3(8) (2006) 2824-2827.

127.　High field ESR measurements on the lithium-ion battery substance LiMn2O4
S. Takano, T. Kaji, S. Okubo, M. Yoshida, Y. Inagaki, S. Kimura, T. Asano, H. Ohta, T. Kunimoto, R. Dziembaj, M. Molenda and C. Rudowicz
Phys. Stat. Sol. ( c) 3(8) (2006) 2820-2823.

128.　New polarization effect and collective excitation in S=1/2 quasi 1D antiferromagnetic quantum spin chain
S. V. Demishev, A. V. Semeno, H. Ohta, S. Okubo, I. E. Tarasenko, T. V. Ishchenko and N. E. Sluchanko
JETP Lett. 84(5) (2006) 305-309.

129.　ESR Measurements on One-Dimensional Quantum Ferrimagnets A3Cu3(PO4)4 with A=Sr and Ca in Submillimeter-Wave Region
S. Kimura, H. Ishikawa, Y. Inagaki, M. Yoshida, S. Okubo, H. Ohta, H. Nojiri, A. A. Belik, M. Azuma and M. Takano
J. Phys. Soc. Jpn. 75(9) (2006) 094718/1-7.

130.　Submillimeter and Millimeter Wave ESR Measurements of the S=1/2 One Dimensional Zigzag Chain MCuO2O7 (M=Sr, Pb)
K. Shiraki, M. Yoshida, S. Okubo, H. Ohta, M. Sakamoto, S. Miyashita, Alexei A. Belik, M. Azuma, and M. Takano
AIP Conf. Proc. 850 (2006) 1025-1026.

131.　High Field ESR Measurements of the Organic Magnet F5PNN
M. Kodama, T. Sakurai, S. Okubo, H. Ohta, and Y. Hosokoshi
AIP Conf. Proc. 850 (2006) 1027-1028.

132.　Submillimeter Wave ESR Measurements of the S=1/2 Trimer Chain M3Cu3(PO4)4 (M=Sr, Ca)
S. Okubo, H. Ishikawa, H. Ohta, S. Kimura, Y. Inagaki, A. A. Belik, M. Azuma, and M. Takano
AIP Conf. Proc. 850 (2006) 1037-1038.

133.　ESR Measurements of KCuCl3 under Multi Extreme Conditions
T. Sakurai, A. Taketani, S. Kimura, M. Yoshida, S. Okubo, H. Ohta, H. Tanaka, and T. Uwatoko
AIP Conf. Proc. 850 (2006) 1057-1058.

134.　Highly Sensitive Detection of Pulsed Field ESR Using a Cantilever at Low Temperature
H. Ohta, M. Kimata, S. Okubo, E. Ohmichi and T. Osada
AIP Conf. Proc. 850 (2006) 1643-1644.

135.　ESR studies of quantum spin systems using the pulsed magnetic field
H. Ohta, M. Yoshida, S. Okubo, T. Ito, H. Takagi, Y. Ajiro
J. Phys.: Conf. Series 51 (2006) 15-22.

136.　Development and application of high field and high pressure ESR system
T. Sakurai, A. Taketani, T. Tomita, S. Okubo, H. Ohta, H. Tanaka and Y. Uwatoko
J. Phys.: Conf. Series 51 (2006) 565-568.

137.　Recent developments of high field ESR systems in Kobe
H. Ohta, M. Tomoo, S. Okubo, T. Sakurai, M. Fujisawa, T. Tomita, M. Kimata, T. Yamamoto, M. Kawauchi and K. Kindo
J. Phys.: Conf. Series 51 (2006) 611-614.