Chisa Hotta
Kyoto Sangyo University
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Publication
Featured researches published by Chisa Hotta.
Nature Materials | 2012
P. Lunkenheimer; Jens Müller; S. Krohns; F. Schrettle; A. Loidl; Benedikt Hartmann; Robert Rommel; Mariano de Souza; Chisa Hotta; John A. Schlueter; M. Lang
Multiferroics, showing simultaneous ordering of electrical and magnetic degrees of freedom, are remarkable materials as seen from both the academic and technological points of view. A prominent mechanism of multiferroicity is the spin-driven ferroelectricity, often found in frustrated antiferromagnets with helical spin order. There, as for conventional ferroelectrics, the electrical dipoles arise from an off-centre displacement of ions. However, recently a different mechanism, namely purely electronic ferroelectricity, where charge order breaks inversion symmetry, has attracted considerable interest. Here we provide evidence for ferroelectricity, accompanied by antiferromagnetic spin order, in a two-dimensional organic charge-transfer salt, thus representing a new class of multiferroics. We propose a charge-order-driven mechanism leading to electronic ferroelectricity in this material. Quite unexpectedly for electronic ferroelectrics, dipolar and spin order arise nearly simultaneously. This can be ascribed to the loss of spin frustration induced by the ferroelectric ordering. Hence, here the spin order is driven by the ferroelectricity, in marked contrast to the spin-driven ferroelectricity in helical magnets.
Physical Review B | 2010
Majed Abdel-Jawad; Ichiro Terasaki; Takahiko Sasaki; Naoki Yoneyama; Norio Kobayashi; Yoshiaki Uesu; Chisa Hotta
We have measured and analyzed the dielectric constant of the dimer Mott insulator
Journal of the Physical Society of Japan | 2003
Chisa Hotta
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Journal of the Physical Society of Japan | 2000
Chisa Hotta; Hidetoshi Fukuyama
(BEDT-TTF)
Nature Communications | 2013
Satoshi Nishimoto; Naokazu Shibata; Chisa Hotta
_2
Physical Review Letters | 2010
Tao Hong; Y. H. Kim; Chisa Hotta; Yasumasa Takano; Grant W. Tremelling; Mark M. Turnbull; C. P. Landee; H Kang; N.B. Christensen; Kim Lefmann; Kai Phillip Schmidt; Götz S. Uhrig; C. Broholm
Cu
Physical Review Letters | 2012
Konstantinos Ninios; Tao Hong; T. Manabe; Chisa Hotta; Susan N. Herringer; Mark M. Turnbull; Christopher P. Landee; Yasumasa Takano; Ho Bun Chan
_2
Physical Review Letters | 2005
Chisa Hotta; Masao Ogata; Hidetoshi Fukuyama
(CN)
Nature Communications | 2014
Hazuki Morisaki; Takashi Koretsune; Chisa Hotta; Jun Takeya; Tsuyoshi Kimura; Yusuke Wakabayashi
_3
Physical Review Letters | 2007
Yoshitaka Maeda; Chisa Hotta; Masaki Oshikawa
, which is known as a playground for a spin-liquid state. Most unexpectedly, this particular organic salt has nontrivial charge degrees of freedom, being characterized by a dipole-glass-like dielectric relaxation below around 60 K. This is ascribed to the charge disproportionation within the dimer due to the intersite Coulomb repulsion. In this respect, the dipole observed here is purely quantum mechanical, and thereby exhibits unexpected responses.