Zobrazeno 1 - 10
of 78
pro vyhledávání: '"Watanabe, Tadataka"'
Autor:
Watanabe, Tadataka, Takayanagi, Kazuya, Nishimura, Ray, Hara, Yoshiaki, Prabhakaran, Dharmalingam, Johnson, Roger D., Blundell, Stephen J.
Orthorhombic pseudobrookites CoTi$_2$O$_5$ and FeTi$_2$O$_5$ have a low-symmetry crystal structure comprising magnetic Co$^{2+}$/Fe$^{2+}$ ions and nonmagnetic Ti$^{4+}$ ions, where the orbital-nondegenerate Co$^{2+}$/Fe$^{2+}$ ions form one-dimensio
Externí odkaz:
http://arxiv.org/abs/2408.03783
Publikováno v:
Phys. Rev. B 96, 014422 (2017)
We perform ultrasound velocity measurements on a single crystal of nearly-metallic spinel Co$_{1.21}$V$_{1.79}$O$_4$ which exhibits a ferrimagnetic phase transition at $T_C \sim$ 165 K. The experiments reveal a variety of elastic anomalies in not onl
Externí odkaz:
http://arxiv.org/abs/1704.07537
Publikováno v:
Phys. Rev. B 92, 174420 (2015)
Ultrasound velocity measurements were performed on a single crystal of spin-frustrated ferrite spinel ZnFe$_2$O$_4$ from 300 K down to 2 K. In this cubic crystal, all the symmetrically-independent elastic moduli exhibit softening with a characteristi
Externí odkaz:
http://arxiv.org/abs/1504.03792
Autor:
Watanabe, Tadataka, Ishikawa, Takashi, Hara, Shigeo, Islam, A. T. M. Nazmul, Wheeler, Elisa M., Lake, Bella
Publikováno v:
Phys Rev. B 90, 100407(R) (2014)
Ultrasound velocity measurements of the orbital-degenerate frustrated spinel MgV$_2$O$_4$ are performed in the high-purity single crystal which exhibits successive structural and antiferromagnetic phase transitions, and in the disorder-introduced sin
Externí odkaz:
http://arxiv.org/abs/1405.2802
Publikováno v:
Phys Rev. B 86, 144413 (2012)
Ultrasound velocity measurements of magnesium chromite spinel MgCr$_2$O$_4$ reveal elastic anomalies in the paramagnetic phase that are characterized as due to geometrical frustration. The temperature dependence of the tetragonal shear modulus $(C_{1
Externí odkaz:
http://arxiv.org/abs/1206.2755
Publikováno v:
Phys Rev. B 84, 020409(R) (2011)
Ultrasound velocity measurements of the orbitally-frustrated GeCo$_2$O$_4$ reveal unusual elastic instabilities due to the phonon-spin coupling within the antiferromagnetic phase. Shear moduli exhibit anomalies arising from the coupling to short-rang
Externí odkaz:
http://arxiv.org/abs/1102.0469
Autor:
Tomiyasu, Keisuke, Tominaga, Ayaka, Hara, Shigeo, Sato, Hirohiko, Watanabe, Tadataka, Ikeda, Shin-Ichi, Iwasa, Kazuaki, Yamada, Kazuyoshi
We report single-crystal neutron diffraction studies on a spinel antiferromagnet GeCo$_2$O$_4$, which exhibits magnetic order with a trigonal propagation vector and tetragonal lattice expansion ($c/a\simeq1.001$) below $T_{\rm N}=21$ K. For this inco
Externí odkaz:
http://arxiv.org/abs/1101.0685
Publikováno v:
Physical Review B 78, 094420 (2008).
Ultrasound velocity measurements of cubic spinel GeCo$_2$O$_4$ in single crystal were performed for the investigation of shear and compression moduli. The shear moduli in the paramagnetic state reveal an absence of Jahn-Teller activity despite the pr
Externí odkaz:
http://arxiv.org/abs/0809.1263
Publikováno v:
In Physics Procedia 2015 75:898-901
Autor:
Otsuka, Shintaro, Furuya, Saeko, Takeda, Ryota, Shimizu, Tomohiro, Shingubara, Shoso, Watanabe, Tadataka, Takano, Yoshiki, Takase, Kouichi
Publikováno v:
In Microelectronic Engineering October 2012 98:367-370