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北海道大学低温物理学研究室助教
井原慶彦 (IHARA Yoshihiko)
理学部5号館5-1-20
011-706-4424

公表論文

2013

T. Hattori, K. Karube, Y. Ihara, K. Ishida, K. Deguchi, N. K. Sato, T. Yamamura
"Spin susceptibility in the superconducting state of the ferromagnetic superconductor UCoGe"
Phys. Rev. B 88, 085127 (2013).
Y. Ihara, H. Seki, A. Kawamoto
"¹³C NMR study of superconductivity near charge instability realized in β''-(BEDT-TTF)₄[(H₃O)Ga(C₂O₄)₃]·C₆H₅NO₂"
J. Phys. Soc. Jpn. 82, 083701 (2013).
S. Nagata, M. Misawa Y. Ihara, A. Kawamoto
"Commensurability of the spin-density-wave state of (TMTSF)₂PF₆ observed by ¹³C-NMR"
Phys. Rev. Lett. 110, 167001 (2013).
K. Noda, Y. Ihara, A. Kawamoto
"Charge disproportionation with lattice distortion of α-(BEDT-TTF)₂RbHg(SCN)₄ observed by ¹³C-NMR"
Phys. Rev. B 87, 085105 (2013).

2012

Y. Ihara, Y. Kimura, K. Kumagai, E. Bauer, G. Rogl, and P. Rogl
"Local electric state of noncentrosymmetric superconductor Mo₃Al₂C revealed by Mo NQR and NMR experiments"
J. Phys.: Conf. Ser. 400, 022033 (2012).
T. Hattori, Y. Ihara, Y. Nakai, K. Ishida, Y. Tada, S. Fujimoto, N. Kawakami, E. Osaki, K. Deguchi, N. K. Sato, and I. Satoh
"Superconductivity induced by longitudinal ferromagnetic fluctuations in UCoGe"
Phys. Rev. Lett. 108, 066403 (2012). Editors' Suggestions
Selected for Viewpoint in Physics

2011

Y. Ihara, K. Ishida
"Unconventional superconductivity realized near magnetism in hydrous cobaltate Na_x(H₃O)_zCoO₂yH₂O"
Superconductivity - Theory and Applications, Assoc. Adir Moyses Luiz (Ed.), ISBN: 978-953-307-151-0, InTech.
K. Karube, T. Hattori, Y. Ihara, Y. Nakai, K. Ishida, N. Tamura, K. Deguchi, N. K. Sato and H. Harima
"⁵⁹Co-Nuclear quadrupole resonance and nuclear magnetic resonance studies on YCoGe --Comparison between YCoGe and UCoGe--"
J. Phys. Soc. Jpn. 80, 064711 (2011).
Y. Ihara, H. Alloul, P. Wzietek, D. Pontiroli, M. Mazzani, M. Ricco
"Spin dynamics at the Mott transition and in the metallic state of the Cs₃C₆₀ superconducting phases"
EPL 94, 37007 (2011).

2010

Y. Ihara, T. Hattori, K. Ishida, Y. Nakai, E. Osaki, K. Deguchi, N. K. Sato, I Satoh
"Anisotropic magnetic fluctuations in the ferromagnetic superconductor UCoGe studied by direction-dependent ⁵⁹Co NMR measurement"
Phys. Rev. Lett. 105, 206403 (2010).
Y. Ihara, H. Alloul, P. Wzietek, D. Pontiroli, M. Mazzani, M. Ricco
"NMR study of the Mott transitions to superconductivity in the two Cs₃C₆₀ phases"
Phys. Rev. Lett. 104, 256402 (2010).
Y. Ihara, P. Wzietek, H. Alloul, M. H. Rummeli, Th. Pichler, F. Simon
"Incidence of the Tomonaga-Luttinger liquid state on the NMR spin-lattice relaxation in carbon nanotube"
EPL 90, 17004 (2010).
S. K. Goh, Y. Nakai, K. Ishida, L. E. Klintberg, Y. Ihara, S. Kasahara, T. Shibauchi, Y. Matsuda, T. Terashima
"Anisotropic superconducting properties of optimally doped BaFe₂(As_0.65P_0.35)₂ under pressure"
Phys. Rev. B 82, 094502 (2010).

2009

Y. Ihara, H. Takeya, K. Ishida, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Magnetic anomalies of hydrous cobaltate compound Na_x(H₃O)_zCoO₂·yH₂O detected by NMR and NQR measurements"
Phys. Rev. B 79, 024510 (2009).

2008

Y. Ihara, H. Takeya, K. Ishida, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Co NQR measurements under hydrostatic pressure on superconducting cobaltate Na_x(H₃O)_zCoO₂·yH₂O"
J. Phys. Chem. Solids 69, 3132 (2008).
Y. Ihara, K. Ishida, H. Ohta, K. Yoshimura
"Co-NMR measurements on crystalline sample of the bilayere hydrate Na_x(H₃O)_zCoO₂·yH₂O"
J. Phys. Soc. Jpn. 77, 073702 (2008).
T. Ohta, Y. Nakai, Y. Ihara, K. Ishida, K. Deguchi, N. K. Sato, I. Satoh
"Ferromagnetic quantum critical fluctuations and anomalous coexistence of ferromagnetism and superconductivity in UCoGe revealed by Co-NMR and NQR studies"
J. Phys. Soc. Jpn. 77, 023707 (2008).

2008

Y. Ihara, K. Ishida, H. Sakurai, E. Takayama-Muromachi
"Phase diagram for Na_x(H₃O)_zCoO₂·yH₂O"
New Research on Superconductivity, NOVA Science Publishers, Inc. pp.61-105, (2007).
Y. Ihara, H. Takeya, K. Ishida, C. Michioka, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Unconventional superconductivity near quantum critical point revealed by Co NQR measurements on Na_x(H₃O)_zCoO₂·yH₂O"
J. Phys. Chem. Solids 68, 2119 (2007).
Y. Ihara, H. Takeya, K. Ishida, C. Michioka, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Quantum critical behavior in superconducting Na_x(H₃O)_zCoO₂·yH₂O observed in a high-field Co NMR experiment"
Phys. Rev. B 75, 212506 (2007).
Y. Ihara, H. Takeya, K. Ishida, C. Michioka, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Quantum critical fluctuations in cobaltate superconductor Na_x(H₃O)_zCoO₂·yH₂O"
Physica C 460-462, 489 (2007).

2006

Y. Ihara, H. Takeya, K. Ishida, H. Ikeda, C. Michioka, K. Yoshimura, K. Takda,a T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Unconventional superconductivity induced by quantum critical fluctuations in hydrate cobaltate Na_x(H₃O)_zCoO₂·yH₂O ---revealed by a Co nuclear quadrupole resonance---"
J. Phys. Soc. Jpn. 75, 124714 (2006).
Y. Ihara, H. Takeya, K. Ishida, C. Michioka, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Co nuclear-quadrupole-resonance measurements on Na_xCoO₂·yH₂O phase diagram for bilayered-hydrate system"
AIP Conference Proceedings 850, 663 (2006).
Y. Ihara, K. Ishida, H. Takeya, C. Michioka, M. Kato, Y. Itoh, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Anisotropic behavior of Knight shift in superconducting state of Na_xCoO₂·yH₂O"
J. Phys. Soc. Jpn. 75, 013708 (2006).

2005

Y. Ihara, K. Ishida, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"¹⁷O NMR measurements on superconducting Na_0.35CoO₂·yH₂O"
J. Phys. Soc. Jpn. 74, 2177 (2005).
Y. Ihara, K. Ishida, C. Michioka, M. Kato, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Weak magnetic order in bilayered-hydtate Na_xCoO₂·yH₂O structure probed by Co nuclear quadrupole resonance ---proposed phase diagram in superconducting Na_xCoO₂·yH₂---"
J. Phys. Soc. Jpn. 74, 867 (2005).

2004

Y. Ihara, K. Ishida, C. Michioka, M. Kato, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Magnetic fluctuations in the metallic state of Na_0.7CoO₂ revealed by ²³Na nuclear magnetic resonance"
J. Phys. Soc. Jpn. 73, 2963 (2004).
Y. Ihara, K. Ishida, C. Michioka, M. Kato, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Correlation between superconducting transition temperature T_c and increase of nuclear spin-lattice relaxation rate divided by temperature 1/T₁T at T_c in the hydrate cobaltate Na_xCoO₂·yH₂O"
J. Phys. Soc. Jpn. 73, 2069 (2004).

2003

K. Ishida, Y. Ihara, Y. Maeno, C. Michioka, M. Kato, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Unconventional superconductivity and nearly ferromagnetic spin fluctuations in Na_xCoO₂·yH₂O"
J. Phys. Soc. Jpn. 72, 3041 (2003).

解説等

井原慶彦
「コバルト酸化物超伝導体におけるCo-NQR測定」
異常量子物性の創成－新しい物理を生む新物質－News Letter vol. No.3 pp.15-17 2007年2月
井原慶彦、竹谷英朗、石田憲二
「三角格子コバルト酸化物超伝導体Na_x(H₃O)_zCoO₂·yH₂Oにおける超伝導と磁気励起」
京都大学低温物質科学研究センター誌　第9号　pp.15-23 2006年12月
井原慶彦
「微視的測定手段を用いた3角格子コバルト酸化物Na_xCoO₂·yH₂Oにおける磁性と超伝導の研究」
物性研究　第84巻　第5号　pp.780-821 2005年8月

学会発表

Y. Ihara, Y. Futami, H. Seki, A. Kawamoto
"¹³C NMR study of charge instability at 100 K in β''-(BEDT-TTF)₄[(H₃O)Ga(C₂O₄)₃]·C₆H₅NO₂"
Japan Physical Society 2013 fall meeting
Tokushima, Japan, September 2013 (oral)
Y. Ihara, H. Seki, Y. Futami, A. Kawamoto
"¹³C NMR study of superconductivity near charge instability in β''-(BEDT-TTF)₄[(H₃O)Ga(C₂O₄)₃]·C₆H₅NO₂"
The International Conference on Strongly Correlated Electron Systems
Tokyo, Japan, August 2013 (poster)
Y. Ihara, H. Seki, A. Kawamoto
"Superconductivity and charge instability in β''-(BEDT-TTF)₄[(H₃O)Ga(C₂O₄)₃]·C₆H₅NO₂ studied by ¹³C NMR"
International Symposium on Crystalline Organic Metals Superconductors and Magnets
Montréal, Canada, July 2013 (oral)
Y. Ihara, H. Seki, A. Kawamoto
"Study of charge instability slightly above superconducting transition in β''-(BEDT-TTF)₄[(H₃O)Ga(C₂O₄)₃]·C₆H₅NO₂"
Physical Society of Japan 2013 Spring meeting
Hiroshima, Japan, March 2013 (oral)
Y. Ihara, H. Seki, A. Kawamoto
"¹³C NMR study of charge fluctuation induced superconductivity in β''-(BEDT-TTF)₄[(H₃O)Ga(C₂O₄)₃]·C₆H₅NO₂"
The 19th International Conference on Magnetism 2012
Busan, Koria, July 2012 (poster)
Y. Ihara, S. Fujii, S. Mombetsu, T. Yanagisawa
"Sb NMR study on single crystalline SmOs₄Sb₁₂"
Physical Society of Japan 2012 Spring Meeting
Hyogo, Japan, March 2012 (oral)
Y. Ihara, P. Wzietek, H. Alloul, D. Pontiroli, M. Mazzani, M. Ricco
"NNMR study of magnetic excitations near Mott transitions in alkali doped fulleride superconductor Cs₃C₆₀"
Physical Society of Japan 2011 Autumn Meeting
Toyama, Japan, September 2011 (oral)
Y. Ihara, P. Wzietek, H. Alloul, M. Rummeli, Th. Pichler, F. Simon
"Tomonaga-Luttinger liquid state in single wall carbon nanotube studied by ¹³C measurement"
Cargese Summer Workshop "Emergent Quantum Phenomena from the Nano to the Macro World"
Cargese, France, July 2009 (poster)
Y. Ihara, F. Bert, P. Mendels, A. S. Wills, J. C. Trombe, M. A. de Vries, A. Harrison
"³⁵Cl and ²D NMR study of crinoatacamite Cu₄(OH)₆Cl₂"
Joint European Japanese Conference: Frustration in Condensed Matter
Lyon, France, May 2009 (poster)
Y. Ihara
58th Meeting of Nobel Laureantes
Lindau, Germany, June 2008
Y. Ihara, K. Ishida
"Superconductivity and magnetism in water intercalated compound Na_x(H₃O)_zCoO₂·yH₂O"
Cargese Summer School 2007 "50th Aniversary of BCS From BCS to Exotic Superconductivity"
Cargese, France, July 2007 (oral)
Y. Ihara
"Quantum critical behavior in superconducting Na_x(H₃O)_zCoO₂·yH₂O revealed by Co NMR measurement"
The International Conference on Strongly Correlated Electron System
Houston, USA, May 2007 (oral)
Y. Ihara, K. Ishida, H. Takeya, C. Michioka, Y. Itoh, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Co-NMR and NQR measurements in Na_x(H₃O)_zCoO₂·yH₂O"
The 17th International Conference on Magnetism
Kyoto, Japan, August 2006 (poster)
Y. Ihara, K. Ishida, H. Takeya, C. Michioka, Y. Itoh, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Co-NMR and NQR measurements in Na_x(H₃O)_zCoO₂·yH₂O"
The first International Symposium of Quantum Beam Science
Ibaraki, Japan, August 2006 (poster)
Y. Ihara, K. Ishida, H. Takeya, C. Michioka, Y. Itoh, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Co-NMR and NQR measurements in Na_x(H₃O)_zCoO₂·yH₂O"
The first International Workshop on the Physical Properties of Lamellar Cobaltates
Orsay, France, September 2006 (oral)
Y. Ihara, K. Ishida, H. Takeya, C. Michioka, Y. Itoh, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Co-NMR study in superconducting Na_xCoO₂·yH₂O"
The 8th International Conference on Materials and Mechanisms of Superconductivity and High-Temperature Superconductor
Dresden, German, September 2006 (poster)
Y. Ihara, K. Ishida, H. Takeya, C. Michioka, M. Kato, K. Yoshimura, K. Takada, T. Sasaki, H. Sakurai, E. Takayama-Muromachi
"Microscopic studies Na_xCoO₂·yH₂O"
The 24th International Conference on Low Temperature Physics
Florida, USA, August 2005 (poster)