Synthesis, Structural and magnetic properties of the solid solution (CuCl1-xBrx)LaNb2O7 (0 (2009)
Tsujimoto, Yoshihiro, Kitada, Atsushi, Kageyama, Hiroshi, Nishi, Masakazu, Narumi, Yasuo, Kindo, Koichi, ...
The two-dimensional (2D) quantum spin system (CuCl)LaNb2O7 has a spin-singlet ground state with a gap of 2.3 meV, while the isostructural material (CuBr)LaNb2O7 displays collinear antiferromagnetic...
Quantum magnetism of perfect spin tetrahedra in Co$_{4}$B$_{6}$O$_{13}$ (2009)
Hagiwara, Hiroyuki, Sato, Hirohiko, Iwaki, Masahiro, Narumi, Yasuo, Kindo, Koichi
Co$_{4}$B$_{6}$O$_{13}$ contains undistorted tetrahedral clusters of magnetic Co$^{2+}$ ions. The high-field magnetization of this magnet exhibits a periodic undulation indicating quantization of the...
Kida, Takanori, Matsunaga, Takahiro, Hagiwara, Masayuki, Mizuguchi, Yoshikazu, Takano, Yoshihiko, Kindo, Koichi
We have performed electrical resistivity measurements of a polycrystalline sample of FeSe$_{0.25}$Te$_{0.75}$, which exhibits superconductivity at $T_{\rm c} \sim 14$ K, in magnetic fields up to 55 T...
Magnetization "Steps" on a Kagome Lattice in Volborthite (2009)
Yoshida, Hiroyuki, Okamoto, Yoshihiko, Tayama, Takashi, Sakakibara, Toshiro, Tokunaga, Masashi, Matsuo, Akira, ...
Magnetic properties of the spin-1/2 kagome-like compound volborthite are studied using a high-quality polycrystalline sample. It is evidenced from magnetization and specific heat measurements that...
Observation of half-integer quantum Hall effect in single-layer graphene using pulse magnet (2008)
Masubuchi, Satoru, Suga, Ken-ichi, Ono, Masashi, Kindo, Koichi, Takeyama, Shojiro, Machida, Tomoki
We report magnetotransport measurements on a single-layer graphene in pulsed magnetic fields up to $B$ = 53 T. With either electron- or hole-type charge carriers, the Hall resistance $R_{H}$ is...
Schröder, Christian, Prozorov, Ruslan, Kögerler, Paul, Vannette, Matthew D., Fang, Xikui, Luban, Marshall, ...
Our measurements of the differential susceptibility dM/dH of the frustrated magnetic molecules Mo72Fe30 and Mo72Cr30 reveal a pronounced dependence on magnetic field (H) and temperature (T) in the...
Awaking of ferromagnetism in GaMnN through control of Mn valence (2006)
Sonoda, Saki, Tanaka, Isao, Oba, Fumiyasu, Ikeno, Hidekazu, Hayashi, Hiroyuki, Yamamoto, Tomoyuki, ...
Room temperature ferromagnetism of GaMnN thin films is awaked by a mild hydrogenation treatment of samples synthesized by molecular beam epitaxy. Local environment of Mn atoms is monitored by Mn-L2,3...
International Symposium on Quantum Spin Systems (2006)
Kindo, Koichi, Ueda, Yutaka, Ohta, Hitoshi, Tanaka, Hidekazu
Intrinsic mechanism for high temperature ferromagnetism in GaMnN (2005)
Sonoda, Saki, Tanaka, Isao, Ikeno, Hidekazu, Yamamoto, Tomoyuki, Oba, Fumiyasu, Araki, Tsutomu, ...
Considerable efforts have been devoted recently to synthesize diluted magnetic semiconductors having ferromagnetic properties at room temperature because of their technological impacts for spintronic...
Strecka, Jozef, Jascur, Michal, Hagiwara, Masayuki, Minami, Kazuhiko, Narumi, Yasuo, Kindo, Koichi
Thermodynamic properties of a tetramer ferro-ferro-antiferro-antiferromagnetic Ising-Heisenberg bond alternating chain are investigated by the use of an exact mapping transformation technique. Exact...
Sakurai, Hiroya, Takada, Kazunori, Yoshii, Shunsuke, Sasaki, Takayoshi, Kindo, Koichi, Takayama-Muromachi, Eiji
Magnetic properties of the novel layered superconductor, Na$_{0.35}$CoO$_{2}$$\cdot$1.3H$_{2}$O have been investigated. From the temperature dependence and field dependence of the magnetization, the...
Properties of Ferromagnetic Ga1-xMnxN Films Grown by Ammonia-MBE (2002)
Sonoda, Saki, Hori, Hidenobu, Yamamoto, Yoshiyuki, Sasaki, Takahiko, Sato, Masugu, Shimizu, Saburo, ...
Using ammonia as nitrogen source for molecular beam epitaxy, the GaN-based diluted magnetic semiconductor Ga1-xMnxN is successfully grown with Mn concentration up to x~6.8% and with p-type...
Narumi, Yasuo, Hagiwara, Masayuki, Kohno, Masanori, Kindo, Koichi
Susceptibility, ESR and magnetization measurements have been performed on si ngle crystals of an S=1 bond alternating chain compound: [Ni(333-tet)(\mu-NO _2)](ClO_4) (333-tet =...
Magnetic Properties of a Quantum Ferrimagnet: NiCu(pba)(D_2O)_3 . 2D_2O (1998)
Hagiwara, Masayuki, Minami, Kazuhiko, Narumi, Yasuo, Tatani, Keiji, Kindo, Koichi
We report the results of magnetic measurements on a powder sample of NiCu(pba)(D_2O)_3 \cdot 2D_2O$ (pba=1,3-propylenebis(oxamato)) which is one of the prototypical examples of an $S$=1/2 and 1...
Electronic properties of U2Ni2Sn (1995)
Kindo, Koichi, Fukushima, T., Kumada, T., De Boer, Frank R., Nakotte, Heinz, Prokes, Karel, ...
We report on the bulk electronic properties of U2Ni2Sn, which crystallizes in the tetragonal U3Si2 structure. Pronounced anomalies in the temperature dependencies of magnetic susceptibility, specific...
Electronic properties of U2Ni2Sn (1994)
Kindo, Koichi, Fukushima, T., Kumada, T., De Boer, Frank R., Nakotte, Heinz, Prokes, Karel, ...
International Conference on Magnetism 1994