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Journal Articles

Reevaluation of structures in $$^{70}$$Se from combined conversion-electron and $$gamma$$-ray spectroscopy

Smallcombe, J.; Garnsworthy, A. B.*; Korten, W.*; Singh, P.*; Muir, D.*; Pr$'o$chniak, L.*; Ali, F. A.*; Andreoiu, C.*; Ansari, S.*; Ball, G. C.*; et al.

Physical Review C, 110(2), p.024318_1 - 024318_16, 2024/08

https://doi.org/10.1103/PhysRevC.110.024318
 Times Cited Count：1 Percentile：52.60(Physics, Nuclear)

Journal Articles

Quantum critical behavior of the hyperkagome magnet Mn$$_3$$CoSi

Yamauchi, Hiroki; Sari, D. P.*; Yasui, Yukio*; Sakakura, Terutoshi*; Kimura, Hiroyuki*; Nakao, Akiko*; Ohara, Takashi; Honda, Takashi*; Kodama, Katsuaki; Igawa, Naoki; et al.

Physical Review Research (Internet), 6(1), p.013144_1 - 013144_9, 2024/02

https://doi.org/10.1103/PhysRevResearch.6.013144

Journal Articles

High-temperature short-range order in Mn$$_3$$RhSi

Yamauchi, Hiroki; Sari, D. P.*; Watanabe, Isao*; Yasui, Yukio*; Chang, L.-J.*; Kondo, Keietsu; Ito, Takashi; Ishikado, Motoyuki*; Hagihara, Masato*; Frontzek, M. D.*; et al.

Communications Materials (Internet), 1, p.43_1 - 43_6, 2020/07

https://doi.org/10.1038/s43246-020-0042-1

High-temperature short-range order is discovered up to 720 K in Mn$$_3$$RhSi by complementary use of neutron scattering and muon spin relaxation measurements.

Journal Articles

Investigation of the $$Delta$$$$n$$ = 0 selection rule in Gamow-Teller transitions; The $$beta$$-decay of $$^{207}$$Hg

Berry, T. A.*; Podoly$'a$k, Zs.*; Carroll, R. J.*; Lic$u{a}$, R.*; Grawe, H.*; Timofeyuk, N. K.*; Alexander, T.*; Andreyev, A. N.; Ansari, S.*; Borge, M. J. G.*; et al.

Physics Letters B, 793, p.271 - 275, 2019/06

https://doi.org/10.1016/j.physletb.2019.04.039
 Times Cited Count：6 Percentile：46.80(Astronomy & Astrophysics)

Journal Articles

Magnetic properties of one-dimensional quantum spin system Rb$$_2$$Cu$$_2$$Mo$$_3$$O$$_{12}$$ studied by muon spin relaxation

Kawamura, Seiko; Tomiyasu, Keisuke*; Koda, Akihiro*; Sari, D. P.*; Asih, R.*; Yoon, S.*; Watanabe, Isao*; Nakajima, Kenji

JPS Conference Proceedings (Internet), 21, p.011007_1 - 011007_5, 2018/03

https://doi.org/10.7566/JPSCP.21.011007

Rb$$_2$$Cu$$_2$$Mo$$_3$$O$$_{12}$$ is a one-dimensional quantum spin system with spin frustration. The magnetic ground state of this system has been expected to be incommensurate spin-singlet from a theoretical study. Furthermore, it was recently reported that this system exhibited ferroelectricity under a magnetic field. We carried out $$mu$$SR studies on this system to understand the magnetic properties. A slow muon spin relaxation due to nuclear dipoles is observed in the whole measured temperatures ranging from 0.06 K to 250 K, indicating that no magnetic ordering. The result suggests that the system shows a spin-singlet ground state. Furthermore, it was found that the distribution of the internal magnetic field were slightly enhanced below 10 K. This temperature dependence resembles that of the electric polarization observed in the magnetic field. It may indicate that some local anomaly of charge/spin related to the ferroelectricity is detected by a microscopic probe.

Oral presentation

Neutron diffraction and $$mu$$SR measurements of spin liquid candidate Ba$$_{3}$$Zn(Ru$$_{1-x}$$Nb$$_{x}$$)$$_{2}$$O$$_{9}$$

Yasui, Yukio*; Sadamatsu, Ryusuke*; Igawa, Naoki; Sari, D. P.*; Watanabe, Isao*; Terasaki, Ichiro*

no journal, , 

Ba$$_{3}$$ZnRu$$_{2}$$O$$_{9}$$ does not show a Curie tail in the temperature dependence of magnetic susceptibility and shows a constant magnetic susceptibility at low temperatures, suggesting the possibility of it being a new type of quantum spin liquid. A ferromagnetic component appears from around 80 K in the magnetic susceptibility of a sample in which part of the Ru$$^{5+}$$ is replaced by nonmagnetic Nb$$^{5+}$$. This peculiar magnetic property is believed to originate from the competition between intra-Ru dimer interactions and inter-dimer interactions. In order to understand the microscopic magnetism of this material system, we carried out powder neutron diffraction and $$mu$$SR experiments on Ba$$_{3}$$Zn(Ru$$_{1-x}$$Nb$$_{x}$$)$$_{2}$$O$$_{9}$$. As a result, the sample with x=0 is considered to be in a state in which antiferromagnetic order and spin liquid coexist.

Oral presentation

Magnetic properties of novel spin system Ba$$_{3}$$Zn$$_{1-x}$$Ca$$_{x}$$Ru$$_{2}$$O$$_{9}$$ with coexistence of spin liquid and antiferromagnetic ordered states

Sadamatsu, Ryusuke*; Igawa, Naoki; Sari, D. P.*; Watanabe, Isao*; Terasaki, Ichiro*; Yasui, Yukio*

no journal, , 

Ba$$_{3}$$MRu$$_{2}$$O$$_{9}$$ (M = Ca, Zn, Co, etc.) has a crystal structure containing a dimer structure in which two Ru$$^{5+}$$ ions are in close proximity. This system exhibits a variety of magnetic properties depending on the element at the M site. In this study, we measured the magnetic susceptibility and magnetic specific heat of Ba$$_{3}$$Zn$$_{1-x}$$Ca$$_{x}$$Ru$$_{2}$$O$$_{9}$$ (0 $$leqq$$ x $$leqq$$ 1) and analyzed the magnetic structure using neutron diffraction method. The magnetic susceptibility decreases continuously with increasing x, and $$chi$$$$rightarrow 0$$ as $$Trightarrow 0$$ at x = 1. On the other hand, specific heat measurements showed a jump at low temperatures, indicating an antiferromagnetic transition.

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