2017 papers

Gapless magnetic excitations in the kagome antiferromagnet Ca-kapellasite probed by 35^Cl NMR spectroscopy
Y. Ihara, T. Sasaki, N. Noguchi, Y. Ishii, M. Oda, and H. Yoshida
Phys. Rev. B 96, 180409(R)-1-5 (2017).
DOI: 10.1103/PhysRevB.96.180409

Crystallization and vitrification of electrons in a glass-forming charge liquid
S. Sasaki, K. Hashimoto, R. Kobayashi, K. Itoh, S. Iguchi, Y. Nishio, Y. Ikemoto, T. Moriwaki, N. Yoneyama, M. Watanabe, A. Ueda, H. Mori, K. Kobayashi, R. Kumai, Y. Murakami, J. Müller, and T. Sasaki
Science 357, 1381-1385 (2017).
DOI :10.1 10.110.1126/science.aal3120

Dimer-Mott and charge-ordered insulating states in the quasi-one-dimensional organic conductors delta'_P and delta'_C-(BPDT-TTF)2ICl2
R. Kobayashi, K. Hashimoto, N. Yoneyama, K. Yoshimi, Y. Motoyama, S. Iguchi, Y. Ikemoto, T. Moriwaki, H. Taniguchi, and T. Sasaki.
Phys. Rev. B 96, 115112-1-8 (2017).
DOI: 10.1103/PhysRevB.96.115112

First-principles investigation of local structure deformation induced by x-ray irradiation in k-(BEDT-TTF)2Cu[N(CN)2]Br.
L. Kang, K. Akagi, K. Hayashi and T. Sasaki.
Phys. Rev. B 95, 214106-1-7 (2017).
DOI: 10.1103/PhysRevB.95.214106

Fine-tuning the Mott metal-insulator transition and critical charge carrier dynamics in molecular conductors.
J. Muller, B. Hartmann and T. Sasaki
Philosophical Magazine 97, 3477-3494 (2017).
DOI: 10.1080/14786435.2017.1296200

Polarization selectivity of charge localization induced by a 7-fs nearly single-cycle light field in an organic metal.
Y. Kawakami, Y. Yoneyama, T. Amano, H. Itoh, K. Yamamoto, Y. Nakamura, H. Kishida, T. Sasaki, S. Ishihara, Y. Tanaka, K. Yonemitsu, and S. Iwai
Phys. Rev. B 95, 201105(R)-1-5 (2017).
DOI: 10.1103/PhysRevB.95.201105

Electric-field-induced intradimer charge disproportionation in the dimer-Mott insulator b'-(BEDT-TTF)2ICl2.
Y. Hattori, S. Iguchi,T. Sasaki, S. Iwai, H. Taniguchi and H. Kishida.
Phys. Rev. B 95, 085149-1-5 (2017).
DOI: 10.1103/PhysRevB.95.085149

超伝導と超電導
佐々木孝彦
固体物理52, 219-225 (2017).

2016 papers

Role of anion ordering and effective pressure in the field-induced spin-density-wave phase of (TMTSF)2X.
T. Minamidate, N. Matsunaga, K. Nomura and T. Sasaki.
Europhysics Letters 115, 37002-1-6 (2016).
DOI: 10.1209/0295-5075/115/37002

Breakdown of Hooke’s law of elasticity at the Mott critical endpoint in an organic conductor.
E. Gati, M. Garst, R. S. Manna, U. Tutsch, B. Wolf, L. Bartosch, H. Schubert, T. Sasaki, J. A. Schlueter, M. Lang.
Science Advances 2, e1601646-1-7 (2016).
DOI: 10.1126/sciadv.1601646

Ultrafast response of plasmalike reflectivity edge in (TMTTF)2AsF6 driven by a 7-fs 1.5-cycle strong-light field.
Y. Naitoh, Y. Kawakami, T. Ishikawa, Y. Sagae, H. Itoh, K. Yamamoto, T. Sasaki, M. Dressel, S. Ishihara, Y. Tanaka, K. Yonemitsu and S. Iwai.
Phys. Rev. B 93, 165126-1-5 (2016).
DOI: 10.1103/PhysRevB.93.165126

Static and dynamic interaction between pi and d electrons in organic superconductor b''-(BEDT-TTF)4[(H3O)Fe(C2O4)3]C6H5Br studied by 13C NMR spectroscopy.
Y. Ihara, Y. Futami, A. Kawamoto, K. Matsui, T. Goto, T. Sasaki, S. Benmansour and C. J. Gomez-Garcia.
Phys. Rev. B 94, 064504-1-6 (2016).
DOI: 10.1103/PhysRevB.94.064504

item Thermodynamic properties of superconducting and non-superconducting Pr2Ba4Cu7O15-d compounds with metallic double chains.
T. Konno, M. Matsukawa, K. Sugawara, H. Taniguchi, J. Echigoya, A. Matsushita,M. Hagiwara, K. Sano, Y. Ohno, Y. Yamada, T. Sasaki, Y. Hayasaka.
Physica C, 521, 13-17 (2016).
DOI: 10.1016/j.physc.2015.12.004

Thermal Conductivity and Spin State of the Spin Diamond-Chain System Azurite Cu3(CO3)2(OH)2.
Y. Hagiya, T. Kawamata, K. Naruse, M. Ohno, Y. Matsuoka, H. Sudo, H. Nagasawa, H. Kikuchi, T. Sasaki and Y. Koike
J. Phys. Soc. Jpn. 85, 034715-1-4 (2016).
DOI: 10.7566/JPSJ.85.034715

Effect of Pressure on Magneto-Transport Properties in the Superconducting and Normal Phases of the Metallic Double Chain Compound Pr2Ba4Cu7O15.
Masayoshi Kuwabara, Michiaki Matsukawa, Keisuke Sugawara, Haruka Taniguchi, Akiyuki Matsushita, Makoto Hagiwara, Kazuhiro Sano, Yoshiaki Ono, Takahiko Sasaki
J. Phys. Soc. Jpn. 85, 124704-1-6 (2016).
DOI: 10.7566/JPSJ.85.124704

2015 papers


Emergence of charge degrees of freedom under high pressure in the organic dimer-Mott insulator b''-(BEDT-TTF)2ICl2.
K. Hashimoto, R. Kobayashi, H. Okamura, H. Taniguchi, Y. Ikemoto, T. Moriwaki, S. Iguchi, M. Naka, S. Ishihara and T. Sasaki
Phys. Rev. B 92, 085149-1-7 (2015).
DOI: 10.1103/PhysRevB.92.085149

Quantum Spin Liquid Emerging from Antiferromagnetic Order by Introducing Disorder
T. Furukawa, K. Miyagawa, T. Itou, M. Ito, H. Taniguchi, M. Saito, S. Iguchi, T. Sasaki and K. Kanoda
Phys. Rev. Lett. 115, 077001-1-5 (2015)
DOI: 10.1103/PhysRevLett.115.077001

Uniaxial Chemical Pressure and Disorder Effects on Magnetic and Dielectric Properties of b'-(BEDT-TTF)2(ICl2)1-x(AuCl2)x.
Naoki Yoneyama, Takahide Kurobe, Satoshi Iguchi, Akira Miura, Takahiro Takei, Nobuhiro Kumada, and Takahiko Sasaki
J. Phys. Soc. Jpn. 84, 033709-1-4 (2015).
DOI: 10.7566/JPSJ.84.033709

Possible quantum Hall effect in a magnetic-field-induced phase transition in the quasi-one-dimensional CDW organic conductor, HMTSF-TCNQ.
K. Murata, Y. Fukumoto, K. Yokogawa, W. Kang, R. Takaoka, R. Tada, H. Hirayama, J. S. Brooks, D. Graf, H. Yoshino, T. Sasaki, R. Kato
Physica B 460, 241-244 (2015).
DOI: 10.1016/j.physb.2014.11.080

Critical Slowing Down of the Charge Carrier Dynamics at the Mott Metal-Insulator Transition
Benedikt Hartmann, David Zielke, Jana Polzin, Takahiko Sasaki. and Jens Mueller
Phys. Rev. Lett. 114, 216403-1-5 (2015).
DOI: 10.1103/PhysRevLett.114.216403

X-ray Irradiation Effect on the Dielectric Charge Response in the Dimer-Mott Insulator k-(BEDT-TTF)2Cu2(CN)3.
S. Sasaki, S. Iguchi, N. Yoneyama and T. Sasaki J. Phys. Soc. Jpn. 84, 074709-1-5 (2015).
DOI: 10.7566/JPSJ.84.074709

分子性ダイマーモット絶縁体の特異な誘電・光応答と電子誘電性
岩井伸一郎,石原純夫,佐々木孝彦
固体物理 50, 59-74 (2015).

導電性高分子PEDOT/PSSの電気伝導性向上を目指した階層構造制御
本間優太,佐々木孝彦,増永啓康,藤原明比古
工業材料 63,No.4, 23-28 (2015).

Institutes in Asia Pacific "Institute for Materials Research, Tohoku University".
T. Sasaki and K. Takahashi
AAPPS bulletin 25, 33- 39 (2015).

2014 papers


Collective excitation of a short-range charge ordering in q-(BEDT-TTF)2CsZn(SCN)4.
K. Hashimoto, S. C. Zhan, R. Kobayashi, S. Iguchi, N. Yoneyama, T. Moriwaki, Y. Ikemoto and T. Sasaki
Phys. Rev. B 89, 085107-1-5 (2014).
DOI: 10.1103/PhysRevB.89.085107

Orientation of Conductive Polymer PEDOT:PSS Films Prepared Under Magnetic Field.
Milena A. Guziak, Yuta Honma, Kenichiro Hashimoto, Terukazu Nishizaki, Kazuo Watanabe, Takahiko Sasaki
JPS Conf. Proc. 1, 012051-1-4 (2014).
DOI: 10.7566/JPSCP.1.012051

Magnetic-field-induced phase transitions in the quasi-one-dimensional organic conductor HMTSF-TCNQ
K. Murata, Y. Fukumoto, K. Yokogawa, R. Takaoka, W. Kang, J. S. Brooks, D. Graf, H. Yoshino, T. Sasaki, and R. Kato
Low Temperature Physics 40, 371-376 (2014).
DOI: 10.1063/1.4869591

Magnetic Raman Scattering Study of Spin Frustrated Systems, k-(BEDT-TTF)2X.
Yuto Nakamura, Naoki Yoneyama, Takahiko Sasaki, Takami Tohyama, Arao Nakamura, and Hideo Kishida
J. Phys. Soc. Jpn. 83, 074708-1-5 (2014).
DOI: 10.7566/JPSJ.83.074708
Optical Study of a Novel Phase Transition from Dimer-Mott to Charge-Order Insulator.
Ryuji Okazaki, Yukio Yasui, Ichiro Terasaki, Yuka Ikemoto, Taro Moriwaki, Takahisa Shikama, Kazuyuki Takahashi, Hatsumi Mori, Hideki Nakaya, and Takahiko Sasaki
JPS conf. Proc. 3, 013010-1-6 (2014).
DOI: 10.7566/JPSCP.3.013010

Optical response of a glassy electronic state in q-(BEDT-TTF)CsZn(SCN)4.
Kenichiro Hashimoto, Shicheng C. Zhan, Ryota Kobayashi, Satoshi Iguchi, Naoki Yoneyama, Taro Moriwaki, Yuka Ikemoto and Takahiko Sasaki
JPS conf. Proc. 3, 013018-1-6 (2014).
DOI: 10.7566/JPSCP.3.013018
Dielectric Response of Multiorbital Molecular Compounds (TTM-TTP)X (X = AuI2 and I3).
Satoru Sasaki, Satoshi Iguchi, Tadashi Kawamoto, Takehiko Mori, and Takahiko Sasaki
J. Phys. Soc. Jpn. 83, 094709-1-5 (2014).
DOI: 10.7566/JPSJ.83.094709

Mott metal-insulator transition induced by utilizing a glasslike structural ordering in low-dimensional molecular conductors.
B. Hartmann, J. Mueller and T. Sasaki
Phys. Rev. B 90, 195150-1-6 (2014).
DOI: 10.1103/PhysRevB.90.195150

Optical freezing of charge motion in an organic conductor.
T. Ishikawa, Y. Sagae, Y. Naitoh, Y. Kawakami, H. Itoh, K. Yamamoto, K. Yakushi, H. Kishida, T. Sasaki, S. Ishihara, Y. Tanaka, K. Yonemitsu and S. Iwai
Nature Communications 5, 5528-1-6 (2014).
DOI:10.1038/ncomms6528
Interface-dependent magnetotransport properties for thin Pt films on ferrimagnetic Y3Fe5O12.
Y. Shiomi, T. Ohtani, S. Iguchi, T. Sasaki, Z. Qiu, H. Nakayama, K. Uchida and E. Saitoh.
Appl. Phys. Lett. 104, 242406-1-5 (2014).
DOI: 10.1063/1.4883898

60年前の「世界の頭脳」の仙台訪問-1枚の記念写真から-
佐々木孝彦
固体物理 49, 499-503 (2014).

2013 papers

Collective excitation of electric dipole on molecular dimer in organic dimer-Mott insulator.
K. Itoh, H. Itoh, M. Naka, S. Saito, I. Hosako, N. Yoneyama, S. Ishihara, T. Sasaki and S. Iwai.
Phys. Rev. Lett. 110, 106401-1-5 (2013).
DOI: 10.1103/PhysRevLett.110.106401

Relaxor ferroelectricity induced by electron correlations in a molecular dimer Mott insulator.
S. Iguchi, S. Sasaki, N. Yoneyama, H. Taniguchi, T. Nishizaki, and T. Sasaki.
Phys. Rev. B 87, 075107-1-5 (2013).
DOI: 10.1103/PhysRevB.87.075107

Narrowing of phonon spectrum induced by ultrafast charge fluctuations in an organic dimer Mott insulator.
K. Itoh, H. Itoh, S. Saito, I. Hosako, Y. Nakamura, H. Kishida, N. Yoneyama, T. Sasaki, S. Ishihara, and S. Iwai.
Phys. Rev. B 88, 125101-1-6 (2013).
DOI: 10.1103/PhysRevB.88.125101

Electrical conductivity of PEDOT:PSS film prepared through organic compound addition.
M. A. Guziak, T. Nishizaki, Y. Honma, K. Watanabe and T. Sasaki. Trans. Mat. Res. Soc. Japan 38, 363-367 (2013).
Optical Conductivity Measurement of a Dimer Mott-Insulator to Charge-Order Phase Transition in a Two-Dimensional Quarter-Filled Organic Salt Compound.
R. Okazaki, Y. Ikemoto, T. Moriwaki, T. Shikama, K. Takahashi, H. Mori, H. Nakaya, T. Sasaki, Y. Yasui, and I. Terasaki.
Phys. Rev. Lett. 111, 217801-1-5 (2013).
DOI: 10.1103/PhysRevLett.111.217801

2012 papers


Influence of randomness on the Mott transition in k-(BEDT-TTF)2X.
T. Sasaki, K. Sano, H. Sugawara, N. Yoneyama and N. Kobayashi.
Phys. Status Solidi B 249, 947-952 (2012).
DOI:10.1002/pssb.201100614

Field-induced CDW in HMTSF-TCNQ.
K. Murata, W. Kang, K. Masuda, T. Kuse, T. Sasaki, K. Yokogawa, H. Yoshino, J. S. Brooks, E. S. Choi, A. Kiswandhi, R. Kato.
Physica B 407, 1927-1929 (2012).
DOI:10.1016/j.physb.2012.01.066

PEDOT Nanocrystal in Highly Conductive PEDOT:PSS Polymer Films.
T. Takano, H. Masunaga, A. Fujiwara, H. Okuzaki and T. Sasaki.
Macromolecules 45, 3859-3865 (2012).
DOI:10.1021/ma300120g

Mott-Anderson Transition in Molecular Conductors: Influence of Randomness on Strongly Correlated Electrons in the k-(BEDT-TTF)2X System.
T. Sasaki.
Crystals 2, 374-392 (2012). DOI:10.3390/cryst2020374

Spin and Charge Transport in the X-ray Irradiated Quasi-2D Layered Compound: k-(BEDT-TTF)2Cu[N(CN)2]Cl.
A. Antal, T. Feh'er, N. Yoneyama, L. Forr'o, T. Sasaki and A. J'anossy.
Crystals {\bf 2}, 579-589 (2012). DOI:10.3390/cryst2020579

Microscopic Phase Separation in Triangular-Lattice Quantum Spin Magnet k-(BEDT-TTF)2Cu2(CN)3 Probed by Muon Spin Relaxation.
S. Nakajima, T. Suzuki, Y. Ishii, K. Ohishi, I. Watanabe, T. Goto, A Oosawa, N. Yoneyama, N. Kobayashi, F. L. Pratt, and T. Sasaki.
J. Phys. Soc. Jpn. 81, 063706-1-4 (2012).
DOI:10.1143/JPSJ.81.063706

強相関電子系分子性導体のモット-アンダーソン転移
佐々木孝彦}
日本物理学会誌 67, 504-508 (2012).

2011 papers

Suppression of Superconductivity by Nonmagnetic Disorder in Organic Superconductor k-(BEDT-TTF)2Cu(NCS)2
T. Sasaki, H. Oizumi, Y. Honda, N. Yoneyama and N. Kobayashi
J. Phys. Soc. Jpn. 80, 104703-1-10 (2011).

Diffusive charge transport with strongly renormalized carrier mass in hole-doped Mott insulators (Y1−xCdx)2Mo2O7 with frustrated pyrochlore lattice.
S. Iguchi, Y. Kumano, K. Ueda, S. Kumakura and Y. Tokura.
Phys. Rev. B 84, 174416-1-5 (2011).

Two pseudogaps with different energy scales at the antinode of the high-temperature Bi2Sr2CuO6 superconductor using angle-resolved photoemission spectroscopy
K. Nakayama, T. Sato, Y.-M. Xu, Z.-H. Pan, P. Richard, H. Ding, H.-H. Wen, K. Kudo, T. Sasaki, N. Kobayashi and T. Takahashi
Phys. Rev. B 83, 224509-1-4 (2011).

2010 papers

Suppression of superconductivity by X-ray irradiation induced disorders in organic superconductor k-(BEDT-TTF)2Cu[N(CN)2]Br.
K. Sano, T. Sasaki, N. Yoneyama, N. Kobayashi.
Physica B 405, S279-S281 (2010).

X-ray irradiation effect on magnetic properties of dimer-Mott insulators: k-(BEDT-TTF)2Cu[N(CN)2]Cl and b'-(BEDT-TTF)2ICl2
N. Yoneyama, T. Sasaki, N. Kobayashi, K. Furukawa and T. Nakamura.
Physica B 405, S244-S246 (2010).

Electron localization near the Mott transition in the organic superconductor k-(BEDT-TTF)2Cu[N(CN)2]Br.
K. Sano, T. Sasaki, N. Yoneyama, N. Kobayashi.
Phys. Rev. Lett. 104, 217003-1-4 (2010).

Magnetic properties of X-ray irradiated organic Mott insulator k-(BEDT-TTF)Cu[N(CN)2]Cl.
N. Yoneyama, K. Furukawa, T. Nakamura, T. Sasaki, and N. Kobayashi
J. Phys. Soc. Jpn. 79, 063706-1-4 (2010).

Anomalous dielectric response in the dimer Mott insulator k-(BEDT-TTF)2Cu(CN)3
M. Abdel-Jawad, I. Terasaki, T. Sasaki, N. Yoneyama, N. Kobayashi, Y. Uesu and C. Hotta.
Phys. Rev. B 82, 125119-1-5 (2010).

Early-stage dynamics of light-matter interaction leading to the insulator-to-metal transition in a charge ordered orgnaic crystal.
Y. Kawakami, T. Fukatsu, Y. Sakurai, H. Unno, H. Itoh, S. Iwai, T. Sasaki, K. Yamamoto, K. Yakushi and K. Yonemitsu.
Phys. Rev. Lett. 105, 246402-1-4 (2010).