Unconventional Superconductivity Induced by Quantum Critical Fluctuations in Hydrate Cobaltate Na_x (H_3O)_z CoO_2・yH_2O : Relationship between Magnetic Fluctuations and Superconductivity Revealed by Co Nuclear Quadrupole Resonance(Condensed matter: elect
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概要
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Co nuclear-quadrupole-resonance (NQR) measurements were performed on various bilayered hydrate cobaltate Na_x(H_3O)_zCoO_2・yH_2O with different values of the superconducting and magnetic-ordering temperatures, T_c and T_M, respectively. From measurements of the temperature and sample dependence of the NQR frequency, it was revealed that the NQR frequency is changed by the change of the electric field gradient (EFG) along the c axis v_<zz> rather than the asymmetry of EFG within the ab-plane. In addition, it is considered that the change of v_<zz> is gaverned mainly by the trigonal distortion of the CoO_2 block layers along the c axis, from the relationships between v_<zz> and the various physical parameters. We found the tendency that samples with V_<zz> larger than 4.2MHz show magnetic ordering, whereas samples with lower v_<zz> show superconductivity. We measured the nuclear spin-lattice relaxation rate 1/T_1 in these samples, and found that magnetic fluctuations depend on samples. The higher-v_<zz> sample has stronger magnetic fluctuations at T_c. From the relationship between v_<zz> and T_c or T_M, we suggest that the NQR frequency can be regarded as a tuning parameter to determine the ground state of the system, and develop the phase diagram using v_<zz>. This phase diagram shows that the highest-T_c sample is located at the point where T_M is considered to be zero, which suggests that the superconductivity is induced by quantum critical fluctuations. We strongly advocate that the hydrate cobaltate superconductor presents an example of the magnetic-fluctuation-mediated superconductivity argued in the heavy-fermion compounds. The coexistence of superconductivity and magnetism observed in the sample with the highest v_<zz> is also discussed on the basis of the results of our experiments.
- 社団法人日本物理学会の論文
- 2006-12-15
著者
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Takasaki S
Himeji Inst. Technol. Kamigohri
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Sasaki Takahiko
Department Of Material Science Himeji Institute Of Technology
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Suzuki H
National Inst. Materials Sci. Ibaraki
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Ishida Kohtaro
Department Of Physics Faculty Of Science And Technology Science Uniersity Of Tokyo
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Sasaki T
Division Of Materials Physics Department Of Physical Science Graduate School Of Engineering Science
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YOSHIMURA K.
Department of Chemistry, Graduate School of Science, Kyoto University
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Sasaki T
Institute For Materials Research Tohoku University
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Sasaoka T
Hitachi Cable Ltd. Ibaraki
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Sakurai H
Graduate School Of Engineering Gunma University
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Sasaki Takatomo
Institute Of Laser Engineering Department Of Electrical Engineering Osaka University
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ISHIDA K.
Department of Material Physics, Osaka University, Toyonaka-Shi, Osaka 560 Japan
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Michioka Chishiro
Department Of Chemistry Graduate School Of Science Kyoto University
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MICHIOKA C.
Department of Chemistry, Graduate School of Science, Kyoto University
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IHARA Y.
Department of Physics, Graduate School of Science, Kyoto University
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TAKEYA H.
Department of Physics, Graduate School of Science, Kyoto University
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IKEDA H.
Department of Physics, Graduate School of Science, Kyoto University
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TAKADA K.
Nanoscale Materials Center, National Institute for Materials Science
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SASAKI T.
Nanoscale Materials Center, National Institute for Materials Science
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SAKURAI H.
Advanced Nano Materials Laboratory, National Institute for Materials Science
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TAKAYAMA-MUROMACHI E.
Advanced Nano Materials Laboratory, National Institute for Materials Science
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Michioka C
Department Of Chemistry Graduate School Of Science Kyoto University
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Takayama‐muromachi E
Advanced Nano Materials Laboratory National Institute For Materials Science
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Takayama‐muromachi Eiji
National Inst. For Materials Sci. Ibaraki
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Takada K
Nanoscale Materials Center National Institute For Materials Science
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Michioka C.
Department Of Chemistry Graduate School Of Science Kyoto University
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Sakurai H.
Advanced Nano Materials Laboratory National Institute For Materials Science
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Ihara Y.
Department Of Physics Graduate School Of Science Kyoto University
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Yoshimura K.
Department Of Chemistry Graduate School Of Science Kyoto University
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Ikeda H.
Department Of Infection Control And Prevention Hyogo College Of Medicine
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Ishida K.
Department of Animal Husbandry, Faculty of Agriculture Tohoku University
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