研究業績
[論文]- "Evidence for Three-dimensional Dirac Semimetal State in Strongly Correlated Organic Quasi-two-dimensional Material"
Naoya Tajima, Yoshitaka Kawasugi, Takao Morinari, Ryuhei Oka, Toshio Naito, and Reizo Kato, J. Phys. Soc. Jpn., 92, (2023) 123702/1-4. - "Negative Magnetoresistance near the Mott Metal-Insulator Transition in the Quantum Spin Liquid Candidate κ-(BEDT-TTF)2Cu2(CN)3"
Yoshitaka Kawasugi, Shutaro Yamazaki, Andrej Pustogow, and Naoya Tajima, J. Phys. Soc. Jpn., 92, (2023) 065001/1-2. - "Observations of ν = 1 Quantum Hall Effect and Inter-Band Effects of Magnetic Fields on Hall Conductivity in Organic Massless Dirac Fermion System α-(BETS)2I3 under Pressure"
Kazuyuki Iwata, Akito Koshiba, Yoshitaka Kawasugi, Reizo Kato, and Naoya Tajima, J. Phys. Soc. Jpn., 92, (2023) 053701/1-5. - "Chasing the spin gap through the phase diagram of a frustrated Mott insulator"
Andrej Pustogow, Yoshitaka Kawasugi, Hirohito Sakurakoji, and Naoya Tajima, Nat. Commun., 14, (2023) 1960/1-6. - "Strain-induced massless Dirac fermion state of the molecular conductor α-(BEDT-TTF)2I3"
Yoshitaka Kawasugi, Haruto Suzuki, Hiroshi M. Yamamoto, Reizo Kato, and Naoya Tajima, Appl. Phys. Lett., 122, (2023) 123102/1-4. - "Coherent Interlayer Coupling in Quasi-Two-Dimensional Dirac Fermions in α-(BEDT-TTF)2I3"
Naoya Tajima, Yoshitaka Kawasugi, Takao Morinari, Ryuhei Oka, Toshio Naito, Reizo Kato, J. Phys. Soc. Jpn., 92, (2022) 013702/1-2. - "Narrow Zero Mode in Organic Massless Dirac Fermion System a-(BEDT-TTF)2I3" A. Mori, Y. Kawasugi, R. Doi, T. Naito, R. Kato, Y. Nishio, and N. Tajima, J. Phys. Soc. Jpn., 91 (2022) 045001-1-2.
- “Large Diamagnetism and Electromagnetic Duality in Two-Dimensional Dirac Electron System": S. Fujiyama, H. Maebashi, N. Tajima, T. Tsumuraya, H-B. Cui, M. Ogata,and R. Kato Phys. Rev. Lett., 128 (2022) 027201-1-5.
- "Simultaneous Control of Bandfilling and Bandwidth in Electric Double-Layer Transistor Based on Organic Mott Insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl" Y. Kawasugi and H. M. Yamamoto, Crystals, 12 (2022) 42/1-15.
- "Electric Double Layer Doping of Charge-Ordered Insulators α-(BEDT-TTF)2I3 and α-(BETS)2I3"
Y. Kawasugi et al., Crystals, 11 (2021) 791/1-10.
DOI: https://doi.org/10.3390/cryst11070791 - "Pressure-induced phase switching of Shubnikov-de Haas oscillations in the molecular Dirac fermion system α-(BETS)2I3"
Y. Kawasugi et al., Phys. Rev. B, 103 (2021) 205140/1-6.
DOI: https://doi.org/10.1103/PhysRevB.103.205140 - “High-Pressure Crystal Structure and Unusual Magnetoresistance of a Single-Component Molecular Conductor [Pd(dddt)2] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate)":
H. Cui, H. H.-M. Yeung, Y. Kawasugi, T. Minamidate, L. K. Saunders, and R. Kato
Crystals, 11 (2021) 534/1-19.
DOI: https://doi.org/10.3390/cryst11050534 - “No Mass Gap Phase Transition in Novel Massless Dirac Fermion Material": JPS Hot Topics, 1 (2021) 023. DOI: https://doi.org/10.7566/JPSHT.1.023
- “Unusual stoichiometry, band structure and band filling in conducting enantiopure radical cation salts of TM-BEDT-TTF showing helical packing of the donors": F. Pop, C. Meziere, M. Allain, P. Auban-Senzier, N. Tajima, D. Hirobe, H. M. Yamamoto, E. Canadell, and N. Avarvari Journal of Materials Chemistry C, (2021). DOI: 10.1039/d1tc01112j
- “Quantum Phase Transition in Organic Massless Dirac Fermion System a-(BEDT-TTF)2I3 under Pressure": R. Unozawa, Y. Kawasugi, M. Suda, H. M. Yamamoto, R. Kato, Y. Nishio, K. Kajita, T. Morinari, and N. Tajima J. Phys. Soc. Jpn., 89 (2020) 123702-1-5. Ediotrs' Choice
- “Universal Behavior of Magnetoresistance in Organic Dirac Electron Systems": R. Kobara, S. Igarashi, Y. Kawasugi, R. Doi, T. Naito, M. Tamura, R. Kato, Y. Nishio, K. Kajita, and N. Tajima J. Phys. Soc. Jpn., 89 (2020) 113704-1-4.
- “ Non-Fermi-liquid Behavior and Doping Asymmetry in an Organic Mott Insulator Interface”: Y. Kawasugi, K. Seki, J. Pu, T. Takenobu, S. Yunoki, H. M. Yamamoto, and Reizo Kato Phys. Rev. B, 100 (2019) 115141-1-7.
- “ Two-Dimensional Ground-State Mapping of a Mott-Hubbard System in a Flexible Field-Effect Device”: Y. Kawasugi, K. Seki, S. Tajima, J. Pu, T. Takenobu, S. Yunoki, H. M. Yamamoto, and Reizo Kato Sci. Adv., 5 (2019) eaav7282-1-9.
- “ Field-Angle Dependence of Interlayer Magnetoresistance in Organic Dirac Electron System a-(BEDT-TTF)2I3”: T. Tani, N. Tajima, and A. Kobayashi Crystals, 9 (2019) 212-1-11.
- “Effects of Carrier Doping on the Transport in the Dirac Electron System a-(BEDT-TTF)2I3 underHigh Pressure”: N. Tajima Crystals, 8 (2018) 126-1-17.
- “Tilted Dirac Cone Effect on Interlayer Magnetoresistance in a-(BEDT-TTF)2I3”: N. Tajima, and T. Morinari J. Phys. Soc. Jpn., 87 (2018) 045002-1-2.
- “Magnetocaloric Effect in Layered Organic Conductor l-(BETS)2FeCl4”: S. Sugiura, K. Shimada, N. Tajima, Y. Nishio, T. Terashima, T. Isono, R. Kato, B. Zhou, and Shinya Uji J. Phys. Soc. Jpn., 87 (2018) 044601-1-6.
- “Slow dynamics of electrons at a metal?Mott insulator boundary in an organic system with disorder”: T. Itou, E. Watanabe, S. Maegawa, A. Tajima, N. Tajima, K. Kubo, R. Kato, K. Kanoda Sci. Adv., 3 (2017) e1601594-1-6.
- “Magnetic Torque Studies in Two-Dimensional Organic Conductor l-(BETS)2FeCl4”: S. Sugiura, K. Shimada, N. Tajima, Y. Nishio, T. Terashima, T. Isono, R. Kato, and S. Uji J. Phys. Soc. Jpn., 86 (2017) 014702.
- “Aperiodic quantum oscillations of particle-hole asymmetric Dirac cones”: E. Tisserond, J. N. Fuchs, M. O. Goerbig, P. Auban-Senzier, C. M´ezi`ere, P. Batail, Y. Kawasugi, M. Suda, H. M. Yamamoto, R. Kato, N. Tajima and M. Monteverde EPL, 119 (2017) 67001.
- “Charge Transport in Antiferromagnetic Insulating Phase of Two-Dimensional Organic Conductor l-(BETS)2FeCl4”: S. Sugiura, K. Shimada, N. Tajima, Y. Nishio, T. Terashima, T. Isono, A. Kobayashi, B. Zhou, R. Kato, and S. Uji J. Phys. Soc. Jpn., 85 (2016) 064703.
- “Effective Field Study of Canted Antiferromagnetic Insulating Phase in Magnetic Organic Conductor l-(BETS)2FeCl4 through Specific Heat Measurement”: K. Shimada, N. Tajima, K. Kajita, and Y. Nishio J. Phys. Soc. Jpn., 85 (2016) 023601.
- “Universality class of the Mott-Hubbard transition”: M. Abdel-Jawad, R. Kato, I. Watanabe, N. Tajima, and Y. Ishii Phys. Rev. Lett., 114 (2015) 106401.
- “Nonlinear photocurrent with threshold of excitation density induced by long-range electron--electron interaction in a charge-ordered molecular conductor (BEDT-TTF)3(ClO4)2”: N. Takubo, N. Tajima, H. M. Yamamoto and R. Kato J. Phys.: Condens. Matter, 26 (2014) 055603.
- “Thermoelectric power of multilayered massless Dirac fermion system a-(BEDT-TTF)2I3 -Charge ordering and zero-gap states-”: R. Kitamura, N. Tajima, K. Kajita, R. Kato, M. Tamura, T. Naito and Y. Nishio JPS Conf. Proc., 1 (2014) 012097.
- “Temperature dependence of internal field by analysis of specific heat on an organic conductor l-BETS2FeCl4 ”: K. Shimada, H. Akiba, N. Tajijma, K. Kajita, Y. Nishio, R. Kato, A. Kobayashi and H. Kobayashi JPS Conf. Proc., 1 (2014) 012110.
- “Molecular Dirac Fermion System -Theoretical and Experimental Approach-”: K. Kajita, Y. Nishio, N. Tajima, Y. Suzumura, and A. Kobayashi J. Phys. Soc Jpn., 83 (2014) 072002. Invited paper
- “Reentrant Metal-Insulator-Metal Transition in (DMe-DCNQI)2Cu System - Competition between Spin and Free Electron Degrees of Freedom-”: Y. Nishio, N. Tajima, and K. Kajita, Current Inorganic Chemistry, 4 (2014) 110. Review paper
- “Observation of photo-induced insulator-to-metal transition in charge-ordered a-(BEDT-TTF)2I3 thin crystal by simultaneous transport and optical measurement” N. Takubo, N. Tajima, H.M. Yamamoto, and R. Kato Journal of Luminescence 137 (2013) 237
- “Bilayer Mott System with Cation…Anion Supramolecular Interactions Based on a Nickel Dithiolene Anion Radical: Coexistence of Ferro- and Antiferromagnetic Anion Layers and Large Negative Magnetoresistance” T. Kusamoto, H. M. Yamamoto, N. Tajima, Y. Oshima, S. Yamashita, and R. Kato Inorg. Chem., 52 (2013) 4759.
- “Photoinduced metal-insulator phase transition in the charge-ordered organic salts (BEDT-TTF)3X2 (X = ReO4, ClO4) is stabilized by lattice distortions” N. Takubo, N. Tajima, H. Cui, R. Kato, and H. M. Yamamoto Phys. Rev. Lett., 110 (2013) 227401.
- “Disordered conduction in single-crystalline dimer Mott compounds”: M. Abdel-Jawad, N. Tajima, R. Kato, and I. Terasaki Phys. Rev. B 88 (2013) 075139.
- “Quantum Hall Effect in Molecular Dirac Fermion Systems with Tilted Cones”: N. Tajima, T. Yamauchi, T. Yamaguchi, M. Suda, Y. Kawasugi, H. M. Yamamoto, R. Kato, Y. Nishio, and K. Kajita Phys. Rev. B 88 (2013) 075315.
- “Interband effects of magnetic field on Hall conductivity in the multilayered massless Dirac fermion system a-(BEDT-TTF)2I3”: N. Tajima, R. Kato, S. Sugawara, Y. Nishio, and K. Kajita, Phys. Rev. B, 85 (2012) 033401-1-4.
- “Transport Phenomena in Multilayered Massless Dirac Fermion System a-(BEDT-TTF)2I3”: N. Tajima, Y. Nishio, and K. Kajita, Crystals, 2 (2012) 643-661. Review
- “Paramagnetic Metal-Antiferromagnetic Insulator Transition in π-d System l-BETS2FeCl4, BETS = Bis(ethylenedithio)tetraselenafulvalene”: H. Akiba, K. Shimada, N. Tajima, K. Kajita, and Y. Nishio, Crystals, 2 (2012) 984-995. Review
- “Paramagnetic Metal-Antiferromagnetic Insulator Transition of λ-BETS2FexGa1-xCl4 System”: H. Akiba, H. Sugawara, K.Nobori, K. Shimada, N. Tajima, Y. Nishio, K. Kajita, B. Zhou, A. Kobayashi, and H. Kobayashi, J. Phys. Soc Jpn., 81 (2012) 053651-1-3.
- “Bilayer Mott System Based on Ni(dmit)2 (dmit = 1,3-dithiole-2-thione-4,5-dithiolate) Anion Radicals: Two Isostructural Salts Exhibit Contrasting Magnetic Behavior”: T. Kusamoto, H. M. Yamamoto, N. Tajima, Y. Oshima, S. Yamashita, and R. Kato, Inorg. Chem., 51 (2012) 11645-11654.
- “Temperature Dependence of Inter-Layer Longitudinal Magnetoresistance in a-(BEDT-TTF)2I3: Positive versus Negative Contributions in a Tilted Dirac Cone System・Eh: S. Sugawara, M. Tamura, N. Tajima, M. Sato, R. Kato, Y. Nishio and K. Kajita, J. Phys. Soc. Jpn.., 79 (2010) 113704-1-4. Editor’s Choice
- “Spin and Valley Splittings in Multilayered Massless Dirac Fermion System”: N. Tajima, M. Sato, S. Sugawara, R. Kato, Y. Nishio and K. Kajita, Phys. Rev. B., 82 (2010) 121420-1-4.
- “Transport Phenomenon of Multilayer Zero-Gap Conductor in the Quantum Limit”: M. Sato, K. Miura, S. Endo, S. Sugawara, N. Tajima, K. Murata, Y. Nishio and K. Kajita, J. Phys. Soc. Jpn.., 80 (2011) 023706-1-4.
- “Local Spin Susceptibility of a-D2I3 (D = bis(ethylendithio)tetraselenafulvalene (BETS) and bis(ethylendithio)dithiadiselenafulvalene (BEDT-STF)) Studied by 77Se NMR”: K. Hiraki, S. Harada, K. Arai, Y. Takano, T. Takahashi, N. Tajima, R. Kato and T. Naito, J. Phys. Soc. Jpn.., 80 (2011) 014715-1-5.
- “Electric-field-induced Mott transition in an organic molecular crystal”: Y. Kawasugi, H. M. Yamamoto, N. Tajima, T. Fukunaga, K. Tsukagoshi and R. Kato, Phys. Rev. B., 82 (2011) 125129-1-9. Editor’s Suggestions
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