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Journal Articles

Emergence of spin-orbit coupled ferromagnetic surface state derived from Zak phase in a nonmagnetic insulator FeSi

Otsuka, Yusuke*; Kanazawa, Naoya*; Hirayama, Motoaki*; Matsui, Akira*; Nomoto, Takuya*; Arita, Ryotaro*; Nakajima, Taro*; Hanashima, Takayasu*; Ukleev, V.*; Aoki, Hiroyuki; et al.

Science Advances (Internet), 7(47), p.eabj0498_1 - eabj0498_9, 2021/11

Journal Articles

Structural, magnetic, transport, and thermoelectric properties of the pseudobrookite AlTi$$_{2}$$O$$_{5}$$-Ti$$_{3}$$O$$_{5}$$ system

Takahama, Ryusei*; Ishii, Toi*; Indo, Daigo*; Arizono, Mitsutoshi*; Terakura, Chieko*; Tokura, Yoshinori*; Takeshita, Nao*; Noda, Masaaki*; Kuwahara, Hideki*; Saiki, Takuo*; et al.

Physical Review Materials (Internet), 4(7), p.074401_1 - 074401_11, 2020/07

 Times Cited Count:1 Percentile:20.84(Materials Science, Multidisciplinary)

Journal Articles

High-field depinned phase and planar Hall effect in the skyrmion host Gd$$_2$$PdSi$$_3$$

Hirschberger, M.*; Nakajima, Taro*; Kriener, M.*; Kurumaji, Takashi*; Spitz, L.*; Gao, S.*; Kikkawa, Akiko*; Yamasaki, Yuichi*; Sagayama, Hajime*; Nakao, Hironori*; et al.

Physical Review B, 101(22), p.220401_1 - 220401_6, 2020/06

 Times Cited Count:12 Percentile:92.16(Materials Science, Multidisciplinary)

Journal Articles

Phase-transition kinetics of magnetic skyrmions investigated by stroboscopic small-angle neutron scattering

Nakajima, Taro*; Inamura, Yasuhiro; Ito, Takayoshi*; Oishi, Kazuki*; Oike, Hiroshi*; Kagawa, Fumitaka*; Kikkawa, Akiko*; Taguchi, Yasujiro*; Kakurai, Kazuhisa*; Tokura, Yoshinori*; et al.

Physical Review B, 98(1), p.014424_1 - 014424_5, 2018/07

 Times Cited Count:4 Percentile:32.53(Materials Science, Multidisciplinary)

We investigated the phase-transition kinetics of magnetic skyrmion lattice (SkL) in MnSi by means of stroboscopic small-angle neutron scattering (SANS). Temporal evolutions of SANS patterns were measured with time resolution of 13 ms while sweeping temperature as fast as 50 Ks$$^{-1}$$. It turned out that the paramagnetic-to-SkL transition immediately occurs upon traversing the equilibrium phase boundary on the rapid cooling, whereas the SkL-to-conical transition can be kinetically avoided to realize the low-temperature metastable SkL with a long-range magnetic order. The formation of the metastable SkL was found to be strongly dependent not only on cooling rate, but also on magnetic eld and trajectory in the H-T phase diagram.

Journal Articles

Science from the initial operation of HRC

Ito, Shinichi*; Yokoo, Tetsuya*; Masuda, Takatsugu*; Yoshizawa, Hideki*; Soda, Minoru*; Ikeda, Yoichi*; Ibuka, Soshi*; Kawana, Daichi*; Sato, Taku*; Nambu, Yusuke*; et al.

JPS Conference Proceedings (Internet), 8, p.034001_1 - 034001_6, 2015/09

Journal Articles

Multi-spin-state dynamics during insulator-metal crossover in LaCoO$$_3$$

Doi, Atsunori*; Fujioka, Jun*; Fukuda, Tatsuo; Tsutsui, Satoshi*; Okuyama, Daisuke*; Taguchi, Yasujiro*; Arima, Takahisa*; Baron, A. Q. R.*; Tokura, Yoshinori*

Physical Review B, 90(8), p.081109_1 - 081109_4, 2014/01

 Times Cited Count:16 Percentile:62.88(Materials Science, Multidisciplinary)

Journal Articles

Soft phonon mode coupled with antiferromagnetic order in incipient-ferroelectric Mott insulators Sr$$_{1-x}$$Ba$$_x$$MnO$$_3$$

Sakai, Hideaki*; Fujioka, Jun*; Fukuda, Tatsuo; Bahramy, M. S.*; Okuyama, Daisuke*; Arita, Ryotaro*; Arima, Takahisa*; Baron, A. Q. R.*; Taguchi, Yasujiro*; Tokura, Yoshinori*

Physical Review B, 86(10), p.104407_1 - 104407_11, 2012/09

 Times Cited Count:27 Percentile:74.83(Materials Science, Multidisciplinary)

Journal Articles

Emergent phenomena in perovskite-type manganites

Taguchi, Yasujiro*; Sakai, Hideaki*; Okuyama, Daisuke*; Ishiwata, Shintaro*; Fujioka, Jun*; Fukuda, Tatsuo; Hashizume, Daisuke*; Kagawa, Fumitaka*; Takahashi, Yoichiro*; Shimano, Ryo*; et al.

Physica B; Condensed Matter, 407(11), p.1685 - 1688, 2012/06

 Times Cited Count:4 Percentile:16.62(Physics, Condensed Matter)

Journal Articles

Magnetic phase diagrams of YVO$$_{3}$$ and TbVO$$_{3}$$ under high pressure

Bizen, Daisuke*; Nakao, Hironori*; Iwasa, Kazuaki*; Murakami, Yoichi*; Osakabe, Toyotaka; Fujioka, Jun*; Yasue, Toshio*; Miyasaka, Shigeki*; Tokura, Yoshinori*

Journal of the Physical Society of Japan, 81(2), p.024715_1 - 024715_6, 2012/02

 Times Cited Count:5 Percentile:40.99(Physics, Multidisciplinary)

The magnetic phase diagrams for $$R$$VO$$_{3}$$ ($$R$$ = Y, Tb) were determined by low temperature and high pressure neutron-diffraction techniques. We found that the magnetic ground state in TbVO$$_{3}$$ changes from ${it C}$-type spin ordering (${it C}$-SO) to ${it G}$-type spin ordering (${it G}$-SO) on application of pressure. The transition of the magnetic ground state also indicates that the ground state of the orbital ordering changes from ${it G}$-type orbital ordering (${it G}$-OO) to ${it C}$-type orbital ordering (${it C}$-OO). In YVO$$_{3}$$, the ${it G}$-SO and ${it C}$-OO phases set in simultaneously up to 6.2 GPa, and the disorder-[${it G}$-SO, ${it C}$-OO] phase transition appears above 6 GPa. This is the first observation of a simultaneous spin and orbital order-disorder phase transition in perovskite-type transition-metal oxides $$R$$MO$$_{3}$$. The [${it G}$-SO, ${it C}$-OO] phase is strongly stabilized with increasing pressure, and both the covalency effect and the superexchange interaction play roles in this stabilization.

Journal Articles

Effect of spin dilution on the magnetic state of delafossite CuCrO$$_{2}$$ with an $$S$$ = 3/2 antiferromagnetic triangular sublattice

Okuda, Tetsuji*; Uto, Kazuma*; Seki, Shinichiro*; Onose, Yoshinori*; Tokura, Yoshinori*; Kajimoto, Ryoichi; Matsuda, Masaaki*

Journal of the Physical Society of Japan, 80(1), p.014711_1 - 014711_7, 2011/04

 Times Cited Count:25 Percentile:77.79(Physics, Multidisciplinary)

Journal Articles

Thermoelectric response in the incoherent transport region near Mott transition; The Case study of La$$_{1-x}$$Sr$$_x$$VO$$_3$$

Uchida, Masaki*; Oishi, Koji*; Matsuo, Mari; Koshibae, Wataru*; Onose, Yoshinori*; Mori, Michiyasu; Fujioka, Jun*; Miyasaka, Shigeki*; Maekawa, Sadamichi; Tokura, Yoshinori*

Physical Review B, 83(16), p.165127_1 - 165127_5, 2011/04

 Times Cited Count:25 Percentile:73.08(Materials Science, Multidisciplinary)

Journal Articles

Multiferroic $$M$$-type hexaferrites with a room-temperature conical state and magnetically controllable spin helicity

Tokunaga, Yusuke*; Kaneko, Yoshio*; Okuyama, Daisuke*; Ishiwata, Shintaro*; Arima, Takahisa*; Wakimoto, Shuichi; Kakurai, Kazuhisa; Taguchi, Yasujiro*; Tokura, Yoshinori*

Physical Review Letters, 105(25), p.257201_1 - 257201_4, 2010/12

 Times Cited Count:231 Percentile:98.31(Physics, Multidisciplinary)

Journal Articles

Critical competition between two distinct orbital-spin ordered states in perovskite vanadates

Fujioka, Jun*; Yasue, Toshio*; Miyasaka, Shigeki*; Yamazaki, Yuichi*; Arima, Takahisa*; Sagayama, Hajime*; Inami, Toshiya; Ishii, Kenji; Tokura, Yoshinori*

Physical Review B, 82(14), p.144425_1 - 144425_12, 2010/10

 Times Cited Count:43 Percentile:13.5(Materials Science, Multidisciplinary)

Journal Articles

Neutron diffraction studies on the multiferroic conical magnet Ba$$_{2}$$Mg$$_{2}$$Fe$$_{12}$$O$$_{22}$$

Ishiwata, Shintaro*; Okuyama, Daisuke*; Kakurai, Kazuhisa; Nishi, Masakazu*; Taguchi, Yasujiro*; Tokura, Yoshinori*

Physical Review B, 81(17), p.174418_1 - 174418_8, 2010/05

 Times Cited Count:66 Percentile:90.81(Materials Science, Multidisciplinary)

Journal Articles

Nematic-to-smectic transition of magnetic texture in conical state

Takeda, Masayasu; Endo, Yasuo; Kakurai, Kazuhisa; Onose, Yoshinori*; Suzuki, Junichi; Tokura, Yoshinori*

Journal of the Physical Society of Japan, 78(9), p.093704_1 - 093704_4, 2009/09

 Times Cited Count:17 Percentile:67.77(Physics, Multidisciplinary)

The complex phase transition of the magnetic long-range order in Fe$$_{0.7}$$Co$$_{0.3}$$Si has been investigated by small-angle neutron scattering (SANS) measurement at low temperatures under an external magnetic field. A variety of scattering patterns, such as ring, crescent-shaped, and diffusive spots, were observed by changing temperature and applying a magnetic field. The results could be interpreted by an analogy of the phase transition of the liquid crystal when the net magnetization is regarded as the director of the liquid crystal.

Journal Articles

Spin chirality and electric polarization in multiferroic compounds RMn$$_2$$O$$_5$$ ($$R$$ = Ho, Er)

Wakimoto, Shuichi; Kimura, Hiroyuki*; Fukunaga, Mamoru*; Nishihata, Keisuke*; Takeda, Masayasu; Kakurai, Kazuhisa; Noda, Yukio*; Tokura, Yoshinori*

Physica B; Condensed Matter, 404(17), p.2513 - 2516, 2009/09

 Times Cited Count:4 Percentile:22.79(Physics, Condensed Matter)

Journal Articles

Unconventional ferroelectric transition in the multiferroic compound TbMnO$$_{3}$$ revealed by the absence of an anomaly in $$c$$-polarized phonon dispersion

Kajimoto, Ryoichi; Sagayama, Hajime*; Sasai, Kenzo*; Fukuda, Tatsuo; Tsutsui, Satoshi*; Arima, Takahisa*; Hirota, Kazuma*; Mitsui, Yukari*; Yoshizawa, Hideki*; Baron, A. Q. R.*; et al.

Physical Review Letters, 102(24), p.247602_1 - 247602_4, 2009/06

 Times Cited Count:11 Percentile:59.16(Physics, Multidisciplinary)

Journal Articles

Dimensional crossover of low-energy magnetic excitation for delafossite oxide Cu$$_{1-x}$$Ag$$_{x}$$CrO$$_{2}$$ with a spin-3/2 antiferromagnetic triangular sublattice

Okuda, Tetsuji*; Kishimoto, Taizo*; Uto, Kazuma*; Hokazono, Takahisa*; Onose, Yoshinori*; Tokura, Yoshinori*; Kajimoto, Ryoichi; Matsuda, Masaaki

Journal of the Physical Society of Japan, 78(1), p.013604_1 - 013604_4, 2009/01

 Times Cited Count:26 Percentile:77.7(Physics, Multidisciplinary)

Journal Articles

$$R$$-dependence of spin exchange interactions in $$R$$MnO$$_{3}$$ ($$R$$ = Rare-Earth Ions)

Kajimoto, Ryoichi; Mochizuki, Hidenori*; Yoshizawa, Hideki*; Shintani, Hiroshi*; Kimura, Tsuyoshi*; Tokura, Yoshinori*

Journal of the Physical Society of Japan, 74(9), p.2430 - 2433, 2005/09

 Times Cited Count:33 Percentile:79.02(Physics, Multidisciplinary)

Magnon excitations have been investigated for PrMnO$$_{3}$$ showing the $textit{A}$-type antiferromagnetic ordering and TbMnO$$_{3}$$ forming a long-period spin ordering by inelastic neutron scattering. Combined with a result of LaMnO$$_{3}$$ [K.~Hirota $textit{et al.}$], the systematic data revealed that the ferromagnetic exchange interaction between nearest-neighbor (NN) Mn sites within the $$ab$$ plane drastically decreases in $$R$$MnO$$_{3}$$ as the ionic radius of $$R$$ is reduced. In addition, finite next-nearest-neighbor (NNN) coupling is evident in TbMnO$$_{3}$$. In contrast, the exchange interaction along the $$c$$ axis shows much weaker $$R$$ dependence consistent with the Mn-O-Mn bond angle. These observations confirm a scenario that explains the evolution of spin structures in $$R$$MnO$$_{3}$$ in terms of the competition between the NN and NNN interactions [T.Kimura $textit{et al.}$].

Journal Articles

Magnetic-field-induced transition in the lattice modulation of colossal magnetoelectric GdMnO$$_3$$ and TbMnO$$_3$$ compounds

Arima, Takahisa*; Goto, Tsuyoshi*; Yamazaki, Yuichi*; Miyasaka, Shigeki*; Ishii, Kenji; Tsubota, Masami; Inami, Toshiya; Murakami, Yoichi*; Tokura, Yoshinori*

Physical Review B, 72(10), p.100102_1 - 100102_4, 2005/09

 Times Cited Count:118 Percentile:95.3(Materials Science, Multidisciplinary)

Single-crystal synchrotron X-ray diffraction measurements in strong magnetic fields have been performed for magnetoelectric compounds GdMnO$$_3$$ and TbMnO$$_3$$. It has been found that the ${bf P}$//a ferroelectric phase induced by the application of a magnetic field at low temperatures is characterized by commensurate lattice modulation along the orthorhombic ${it b}$ axis with q=1/2 and q=1/4. The lattice modulation is ascribed to antiferromagnetic spin alignment with a modulation vector of (0 1/4 1). The change of the spin structure is directly correlated with the magnetic-field-induced electric phase transition, because any commensurate spin modulation with (0 1/4 1) should break glide planes normal to the ${it a}$ axis of the distorted perovskite with the space group.

42 (Records 1-20 displayed on this page)