H. Aizawa

activity

20072025

most citedRealization of Berezinskii's superconductivity in quasi-one-dimensional systems

33 citations · 154 across the 13 of their papers we have counts for

collaborators

13 papers

cond-mat.str-el2025

Kink in Stoner Factor as a Signature of Changing Magnetic Fluctuations in the Organic Conductor $λ$ -(BETS) $_{2}$ GaCl $_{4}$

Hirohito Aizawa

In this study, we theoretically investigated the magnetic properties of the quasi-two-dimensional organic conductor $λ$ -(BETS) $_{2}$ GaCl $_{4}$ using a multi-band Hubbard model and the…

cond-mat.str-el2020★ 2 cited

Ferrimagnetism Induced by Off-Site Coulomb Interaction in an Itinerant Electron System

Hirohito Aizawa

Motivated by weak ferromagnetism (FM) in a $τ$ -type molecular conductor ( $τ$ -MC), we examine its mechanism using a two-band extended Hubbard model. Applying the random phase approx…

cond-mat.supr-con2018★ 16 cited

Electronic Structure Calculation and Superconductivity in $λ$ -(BETS) $_{2}$ GaCl $_{4}$

Hirohito Aizawa, Takashi Koretsune, Kazuhiko Kuroki +1

Quasi-two-dimensional molecular conductor $λ$ -(BETS) $_{2}$ GaCl $_{4}$ shows superconductivity (SC) below 5.5K, neighboring the dimer-type Mott insulating phase. To elucidate the origin…

cond-mat.supr-con2018★ 7 cited

Microscopic theory of a superconducting gap in the quasi-one-dimensional organic conductor (TMTSF) $_{2}$ ClO $_{4}$ : Model derivation and two-particle self-consistent analysis

Hirohito Aizawa, Kazuhiko Kuroki

We present a first-principles band calculation for the quasi-one-dimensional (Q1D) organic superconductor (TMTSF) $_{2}$ ClO $_{4}$ . An effective tight-binding model with the TMTSF molecu…

cond-mat.str-el2015★ 14 cited

Enhancement of electron correlation due to the molecular dimerization in organic superconductors $β$ -(BDA-TTP) $_{2} X$ ( $X$ =I $_{3}$ , SbF $_{6}$ )

Hirohito Aizawa, Kazuhiko Kuroki, Jun-ichi Yamada

We perform a first principles band calculation for quasi-two-dimensional organic superconductors $β$ -(BDA-TTP) $_{2}$ I $_{3}$ and $β$ -(BDA-TTP) $_{2}$ SbF $_{6}$ . The first principles b…

cond-mat.mtrl-sci2014★ 6 cited

Molecular Dependence of the Large Seebeck Effect in τ-type Organic Conductors

Hirohito Aizawa, Kazuhiko Kuroki, Harukazu Yoshino +3

We study the Seebeck effect in the $τ$ -type organic conductors, $τ$ -(EDO- $S$ , $S$ -DMEDT-TTF) $_{2}$ (AuBr $_{2}$ ) $_{1 + y}$ and $τ$ -(P- $S$ , $S$ -DMEDT-TTF) $_{2}$ (AuBr $_{2}$ ) $_{1 + y}$ , where…

cond-mat.supr-con2012★ 4 cited

Model construction and superconductivity analysis of organic conductors β-(BDA-TTP)_2MF_6 (M=P, As, Sb, Ta) based on first principles band calculation

Hirohito Aizawa, Kazuhiko Kuroki, Syuma Yasuzuka +1

We perform a first principles band calculation for a group of quasi-two-dimensional organic conductors β-(BDA-TTP)2MF6 (M=P, As, Sb, Ta). The ab-initio calculation shows that the d…

cond-mat.supr-con2010★ 33 cited

Realization of Berezinskii's superconductivity in quasi-one-dimensional systems

Keisuke Shigeta, Yukio Tanaka, Kazuhiko Kuroki +2

We revisit the pairing symmetry competition in quasi-one-dimensional systems. We show that spin-triplet s-wave pairing, where the pair is formed by electrons with different times a…

cond-mat.mtrl-sci2010★ 6 cited

"Pudding Mold"-type Band as an Origin of Large Thermopower in tau-type Organic Conductors

Hirohito Aizawa, Kazuhiko Kuroki, Harukazu Yoshino +1

We study the origin of the large thermopower in quasi-two-dimensional a $τ$ -type organic conductor, $τ - (E D O - S, S - D M E D T - T T F)_{2} (A u B r_{2})_{1 + y}$ ( $y \leq 0.875$ ), from the view point of…

cond-mat.mtrl-sci2010★ 6 cited

Thermoelectric figure of merit of tau-type conductors of several donors

H. Yoshino, H. Aizawa, K. Kuroki +3

Dimensionless thermoelectric figure of merit $Z T$ is investigated for two-dimensional organic conductors $τ - (E D O - S, S - D M E D T - T T F)_{2} (A u I_{2})_{1 + y}$ , $τ$ -(EDT-S,S-DMEDT-TTF)_2(AuI_2)_{1…

cond-mat.supr-con2009★ 9 cited

Pairing competition in a quasi-one-dimensional model of organic superconductors (TMTSF) $_{2} X$ in magnetic field

Hirohito Aizawa, Kazuhiko Kuroki, Yukio Tanaka

We microscopically study the effect of the magnetic field (Zeeman splitting) on the superconducting state in a model for quasi-one-dimensional organic superconductors (TMTSF)$_{2}X…

cond-mat.supr-con2008★ 30 cited

Strong parity mixing in the FFLO superconductivity in systems with coexisting spin and charge fluctuations

Hirohito Aizawa, Kazuhiko Kuroki, Takehito Yokoyama +1

We study the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state of spin fluctuation mediated pairing, and focus on the effect of coexisting charge fluctuations. We find that (i) consecu…

cond-mat.supr-con2007★ 21 cited

Strong magnetic field enhancement of spin triplet pairing arising from coexisting $2 k_{F}$ spin and $2 k_{F}$ charge fluctuations

Hirohito Aizawa, Kazuhiko Kuroki, Yukio Tanaka

We study the effect of the magnetic field (Zeeman splitting) on the triplet pairing. We show generally that the enhancement of spin triplet pairing mediated by coexisting $2 k_{F}$ sp…