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Journal Articles

Dimensional reduction by geometrical frustration in a cubic antiferromagnet composed of tetrahedral clusters

Okuma, Ryutaro*; Kofu, Maiko; Asai, Shinichiro*; Avdeev, M.*; Koda, Akihiro*; Okabe, Hirotaka*; Hiraishi, Masatoshi*; Takeshita, Soshi*; Kojima, Kenji*; Kadono, Ryosuke*; et al.

Nature Communications (Internet), 12, p.4382_1 - 4382_7, 2021/07

https://doi.org/10.1038/s41467-021-24636-1
 Times Cited Count：6 Percentile：61.42(Multidisciplinary Sciences)

Journal Articles

Correlated Li-ion migration in the superionic conductor Li$$_{10}$$GeP$$_{2}$$S$$_{12}$$

Yajima, Takeshi*; Hinuma, Yoyo*; Hori, Satoshi*; Iwasaki, Rui*; Kanno, Ryoji*; Ohara, Takashi; Nakao, Akiko*; Munakata, Koji*; Hiroi, Zenji*

Journal of Materials Chemistry A, 9(18), p.11278 - 11284, 2021/05

https://doi.org/10.1039/D1TA00552A
 Times Cited Count：19 Percentile：80.41(Chemistry, Physical)

Journal Articles

Bound spinon excitations in the spin-$$frac{1}{2}$$ anisotropic triangular antiferromagnet Ca$$_{3}$$ReO$$_{5}$$Cl$$_{2}$$

Nawa, Kazuhiro*; Hirai, Daigoro*; Kofu, Maiko; Nakajima, Kenji; Murasaki, Ryo*; Kogane, Satoshi*; Kimata, Motoi*; Nojiri, Hiroyuki*; Hiroi, Zenji*; Sato, Taku*

Physical Review Research (Internet), 2(4), p.043121_1 - 043121_11, 2020/12

https://doi.org/10.1103/PhysRevResearch.2.043121

The spin excitations of the $$S$$ = $$frac{1}{2}$$ anisotropic triangular antiferromagnet Ca$$_{3}$$ReO$$_{5}$$Cl$$_{2}$$ were investigated by inelastic neutron-scattering experiments. The spin excitation spectrum exhibits sharp dispersive modes in addition to a spinonlike continuum. The consistency with the simulated spectrum based on the random-phase approximation is better for Ca$$_{3}$$ReO$$_{5}$$Cl$$_{2}$$ than for Cs$$_{2}$$CuCl$$_{4}$$, indicating that the spin system in the former remains closer to a Tomonaga-Luttinger liquidlike disordered state.

Journal Articles

Maximizing $$T_c$$ by tuning nematicity and magnetism in FeSe$$_{1-x}$$S$$_x$$ superconductors

Matsuura, Kohei*; Mizukami, Yuta*; Arai, Yuki*; Sugimura, Yuichi*; Maejima, Naoyuki*; Machida, Akihiko*; Watanuki, Tetsu*; Fukuda, Tatsuo; Yajima, Takeshi*; Hiroi, Zenji*; et al.

Nature Communications (Internet), 8, p.1143_1 - 1143_6, 2017/10

https://doi.org/10.1038/s41467-017-01277-x
 Times Cited Count：80 Percentile：91.57(Multidisciplinary Sciences)

Journal Articles

Orbital magnetism in Cd$$_2$$Os$$_2$$O$$_7$$ studied by X-ray magnetic circular dichroism

Matsuda, Yasuhiro*; Her, J.-L.*; Michimura, Shinji*; Inami, Toshiya; Suzuki, Motohiro*; Kawamura, Naomi*; Mizumaki, Masaichiro*; Kindo, Koichi*; Yamaura, Junichi*; Hiroi, Zenji*

Physical Review B, 84(17), p.174431_1 - 174431_5, 2011/11

https://doi.org/10.1103/PhysRevB.84.174431
 Times Cited Count：25 Percentile：69.58(Materials Science, Multidisciplinary)

X-ray magnetic circular dichroism (XMCD) at the $$L$$$$_{2,3}$$-edge of Os has been investigated in the antiferromagneticphase of Cd$$_2$$Os$$_2$$O$$_7$$, which exhibits a metal-insulator transition around 227 K. According to the sum rule, the XMCD spectra at 10 and 37 T clearly show that the ratio between the orbital magnetic moment ($$m_{rm L}$$) and spinmagnetic moment ($$m_{rm S}$$) is $$m_{rm L}/m_{rm S} = 0.16 pm 0.02$$, and that $$m_{rm L}$$ and $$m_{rm S}$$ are coupled in parallel ($$m_{rm L}parallel m_{rm S}$$). These phenomena are unusual in that the expected ground state of Os$$^{5+}$$ (5$$d^3$$) is an orbital singlet in a cubic crystal field, and $$m_{rm L}$$and $$m_{rm S}$$ should be antiparallel for a less than half-filled system in accordance with Hund's third rule. It is likely that the spin-orbit coupling is important for explaining the observed orbital magnetism.

Journal Articles

Anomalous magnetic phase in an undistorted pyrochlore oxide Cd$$_2$$Os$$_2$$O$$_7$$ induced by geometrical frustration

Koda, Akihiro*; Kadono, Ryosuke*; Oishi, Kazuki; Saha, S. R.*; Higemoto, Wataru; Yonezawa, Shigeki*; Muraoka, Yuji*; Hiroi, Zenji*

Journal of the Physical Society of Japan, 76(6), p.063703_1 - 063703_4, 2007/06

https://doi.org/10.1143/JPSJ.76.063703
 Times Cited Count：18 Percentile：66.99(Physics, Multidisciplinary)

We report on the muon spin relaxation study of a pyrochlore oxide, Cd$$_2$$Os$$_2$$O$$_7$$, which exhibits a metal-insulator transition. It reveals strong spin fluctuation below the MI transition, suggesting a predominant role of geometrical spin frustration. Meanwhile, an incommensurate spin density wave discontinuously develops at lower temperature. These observations strongly suggest the occurrence of an anomalous magnetic transition and associated change in the local spin dynamics in undistorted pyrochlore antiferromagnet.

Journal Articles

Magnetic properties and single crystal growth of a spin gapped compound, high pressure phase of (VO)$$_{2}$$P$$_{2}$$O$$_{7}$$

Saito, Takashi*; Azuma, Masaki*; Takano, Mikio*; Hiroi, Zenji*; Narumi, Yasuo*; Kindo, Koichi*; Utsumi, Wataru

Funtai Oyobi Fummatsu Yakin, 46(9), p.1014 - 1019, 1999/09

https://doi.org/10.2497/jjspm.46.1014

no abstracts in English

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