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Journal Articles

High-pressure synthesis and physical properties of new iron (nickel)-based superconductors

Shirage, P. M.*; Miyazawa, Kiichi*; Ishikado, Motoyuki; Kiho, Kunihiro*; Lee, C.-H.*; Takeshita, Nao*; Matsuhata, Hirofumi*; Kumai, Reiji*; Tomioka, Yasuhide*; Ito, Toshimitsu*; et al.

Physica C, 469(9-12), p.355 - 369, 2009/06

https://doi.org/10.1016/j.physc.2009.03.027
 Times Cited Count：40 Percentile：79.94(Physics, Applied)

We have utilized a high-pressure (HP) technique to synthesize a series of newly-discovered iron (nickel)-based superconductors. The effect of (O)-deficiency, variation of $$Ln$$ ions, and the external pressure on $$T$$$$_{rm c}$$ are examined. All the experimental data indicate strong correlation between the crystal structure and the superconductivity of the oxypnictide superconductors. Upper critical field measurement on single crystalline sample of PrFeAsO$$_{1-y}$$ shows the superconducting anisotropy of 5, which is smaller than cuprates. We also demonstrate that HP technique is applicable for the so-called "122" systems.

Journal Articles

Crystal and magnetic structure of Ca$$_{3}$$Ru$$_{2}$$O$$_{7}$$

Yoshida, Yoshiyuki*; Ikeda, Shinichi*; Matsuhata, Hirofumi*; Shirakawa, Naoki*; Lee, C.-H.*; Katano, Susumu

Physical Review B, 72(5), p.054412_1 - 054412_7, 2005/08

https://doi.org/10.1103/PhysRevB.72.054412
 Times Cited Count：118 Percentile：94.76(Materials Science, Multidisciplinary)

The crystal structure of the double-layered Ca$$_{3}$$Ru$$_{2}$$O$$_{7}$$ has been studied by convergent beam electron diffraction and powder neutron diffraction. The temperature dependence of the diffraction pattern reveals that all the lattice constants jump at the first-order metal-nonmetal transition at 48 K without a change of the space group symmetry of Bb21m. In the neutron diffraction experiment, an additional magnetic reflection emerges below the Neel temperature, 56K. A possible model for this antiferromagnetic ordering is proposed, in which model magnetic moments align ferromagnetically within the double layer and antiferromagnetically between the double layers. This model reasonably explains the characteristic field dependence of the magnetoresistance observed at around 6 T.

Journal Articles

Low-temperature structural change and magnetic anomaly in superconducting Cd$$_{2}$$Re$$_{2}$$O$$_{7}$$

Sakai, Hironori; Kato, Harukazu; Kambe, Shinsaku; Walstedt, R. E.; Ono, Hiroyuki*; Kato, Masaki*; Yoshimura, Kazuyoshi*; Matsuhata, Hirofumi*

Physical Review B, 66(10), p.100509_1 - 100509_4, 2002/09

https://doi.org/10.1103/PhysRevB.66.100509
 Times Cited Count：25 Percentile：72.83(Materials Science, Multidisciplinary)

The structural phase transition at $$T^{*}sim$$ 200 K in the superconducting pyrochlore oxide Cd$$_{2}$$Re$$_{2}$$O$$_{7}$$ has been investigated using X-ray and electron diffraction experiments and $$^{111}$$Cd NMR measurements. The susceptibility for Cd$$_{2}$$Re$$_{2}$$O$$_{7}$$ in the high temperature region ($$Tgg T^{*}$$) obeys a Curie-Weiss law with a large and negative Weiss temperature, which indicates that this system possesses a localized moment nature with antiferromagnetic interactions, leading to geometrical frustration. X-ray and electron diffraction measurements suggest the tetramerization of Re below $$T^{*}$$, which induces a nano-sized stripe structure. From $$^{111}$$Cd NMR experiments, a large orbital susceptibility is identified by means of a $$K$$-$$chi$$ plot. Both the spin susceptibility and $$(T_{1}T)^{-1}$$ are found to decrease sharply below $$T^{*}$$, signaling a decrease in density of states which is apparently caused by a developing partial energy gap at the Fermi surface.

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