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論文

Coexistence of magnetoelectric and antiferroelectric-like orders in Mn$$_{3}$$Ta$$_{2}$$O$$_{8}$$

木村 健太*; 八木 直輝*; 長谷川 舜介*; 萩原 雅人; 三宅 厚志*; 徳永 将史*; Cao, H.*; 益田 隆嗣*; 木村 剛*

Inorganic Chemistry, 60(20), p.15078 - 15084, 2021/10

https://doi.org/10.1021/acs.inorgchem.1c02461
 被引用回数：3 パーセンタイル：21.56(Chemistry, Inorganic & Nuclear)

In materials showing a linear magnetoelectric (ME) effect, unconventional functionalities can be anticipated such as electric control of magnetism and nonreciprocal optical responses. Thus, the search of new linear ME materials is of interest in materials science. Here, using a recently proposed design principle of linear ME materials, which is based on the combination of local structural asymmetry and collinear antiferromagnetism, we demonstrate that an anion-deficient fluorite derivative Mn$$_{3}$$Ta$$_{2}$$O$$_{8}$$ is a new linear ME material. This is evidenced by the onset of magnetic-field-induced electric polarization in its collinear antiferromagnetic phase below $$T_{rm N}$$ = 24 K. Furthermore, we also find an antiferroelectric-like phase transition at $$T_{rm S}$$ = 55 K, which is attributable to an off-center displacement of magnetic Mn$$^{2+}$$ ions. The present study shows that Mn$$_{3}$$Ta$$_{2}$$O$$_{8}$$ is a rare material that exhibits both ME and antiferroelectric-like transitions. Thus, Mn$$_{3}$$Ta$$_{2}$$O$$_{8}$$ may provide an opportunity to investigate the physics associated with complicated interactions between magnetic (spin) and electric dipole degrees of freedom.

論文

Horizontal line nodes in Sr$$_2$$RuO$$_4$$ proved by spin resonance

飯田 一樹*; 古府 麻衣子; 鈴木 雄大*; 村井 直樹; 河村 聖子; 梶本 亮一; 稲村 泰弘; 石角 元志*; 長谷川 舜介*; 益田 隆嗣*; et al.

Journal of the Physical Society of Japan, 89(5), p.053702_1 - 053702_5, 2020/05

https://doi.org/10.7566/JPSJ.89.053702
 被引用回数：23 パーセンタイル：78.59(Physics, Multidisciplinary)

We investigated the low-energy incommensurate (IC) magnetic fluctuations in Sr$$_2$$RuO$$_4$$ by the high-resolution inelastic neutron scattering measurements and random phase approximation (RPA) calculations. We observed a spin resonance with energy of $$hbar omega_{rm res}0.56$$ meV centered at a characteristic wavevector $$Q_{rm res}=(0.3,0.3,0.5)$$. The resonance energy corresponds well to the superconducting gap 2$$Delta$$ = 0.56 meV estimated by the tunneling spectroscopy. The spin resonance shows the $$L$$ modulation with a maximum at around $$L = 0.5$$. The $$L$$ modulated intensity of the spin resonance and our RPA calculations indicate that the superconducting gaps regarding the quasi-one-dimensional $$alpha$$ and $$beta$$ sheets at the Fermi surfaces have the horizontal line nodes. These results may set a strong constraint on the pairing symmetry of Sr$$_2$$RuO$$_4$$. We also discuss the implications on possible superconducting order parameters.

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