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Journal Articles

Neutron scattering study of antiferromagnet U$$_{2}$$Pt$$_{6}$$Al$$_{15}$$

Ota, Kyugo*; Matsumoto, Yuji*; Watabe, Yuki*; Kaneko, Koji; Tabata, Chihiro; Haga, Yoshinori

New Physics; Sae Mulli, 73(12), p.1170 - 1173, 2023/12

https://doi.org/10.3938/NPSM.73.1170

We have performed the neutron scattering study of antiferromagnet U$$_{2}$$Pt$$_{6}$$Al$$_{15}$$ with the honeycomb lattice to determine the magnetic structure. U$$_{2}$$Pt$$_{6}$$Al$$_{15}$$ exhibits two phase transitions at $$T_{rm m1}$$ = 9 K and $$T_{rm m2}$$ = 26 K. In phase I at $$T_{rm m1}$$ $$<$$ $$T$$ $$<$$ $$T_{rm m2}$$, the magnetic reflections described by a propagation vector $$kappa$$$$_{rm I}$$ = (1/3, 0, 0) were observed. In phase II at $$T$$ $$<$$ $$T_{rm m1}$$, magnetic reflections of $$kappa$$$$_{rm I}$$ = (1/3, 0, 0) and $$kappa$$$$_{rm II}$$ = (1/2, 0, 0) were observed and the magnetic reflection intensity of $$kappa$$$$_{rm I}$$ = (1/3, 0, 0) is weak but finite. The hysteresis in the temperature dependent intensities is observed across the phase transition at $$T_{rm m1}$$, suggesting that the transition at $$T_{rm m1}$$ is of first order.

Journal Articles

Synthesis, crystal structure, local structure, and magnetic properties of polycrystalline and single-crystalline Ce$$_2$$Pt$$_6$$Al$$_{15}$$

Ota, Kyugo*; Watabe, Yuki*; Haga, Yoshinori; Iesari, F.*; Okajima, Toshihiko*; Matsumoto, Yuji*

Symmetry (Internet), 15(8), p.1488_1 - 1488_13, 2023/07

https://doi.org/10.3390/sym15081488
 Times Cited Count：1 Percentile：60.94(Multidisciplinary Sciences)

Journal Articles

Anisotropic physical properties of layered antiferromagnet U$$_2$$Pt$$_6$$Ga$$_{15}$$

Matsumoto, Yuji*; Haga, Yoshinori; Yamamoto, Etsuji; Takeuchi, Tetsuya*; Miyake, Atsushi*; Tokunaga, Masashi*

Journal of the Physical Society of Japan, 90(7), p.074707_1 - 074707_6, 2021/07

https://doi.org/10.7566/JPSJ.90.074707
 Times Cited Count：0 Percentile：0(Physics, Multidisciplinary)

Journal Articles

Universal scaling behavior under pressure in the heavy-fermion antiferromagnet CeRh$$_2$$Si$$_2$$; $$^{29}$$Si NMR study

Sakai, Hironori; Matsumoto, Yuji*; Haga, Yoshinori; Tokunaga, Yo; Kambe, Shinsaku

Physical Review B, 103(8), p.085114_1 - 085114_8, 2021/02

https://doi.org/10.1103/PhysRevB.103.085114
 Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)

The microscopic origin of a magnetic phase diagram under pressure in a heavy fermion antiferromagnet CeRh$$_2$$Si$$_2$$ was investigated using the $$^{29}$$Si nuclear magnetic resonance (NMR) technique. We investigated the temperature and pressure dependencies of $$q$$-independent local fluctuations caused by the single-site Kondo effect. A universal scaling behavior observed on the energy scale of the local fluctuations in an entire pressure region demonstrates that a characteristic energy scale $$T_0$$ of Kondo interactions monotonically increases by applying pressure without a critical anomaly around the quantum critical pressure $$P_{rm c}$$ of antiferromagnetism. Our NMR result agrees with the Doniach picture of the heavy-fermion phase diagram, where the progressive delocalization of the $$f$$-electrons occurs across $$P_{rm c}$$, accompanied by the development of antiferromagnetic correlations among the $$f$$-electrons.

Journal Articles

Structural characterization and magnetic behavior of uranium compound U$$_2$$Pt$$_6$$Al$$_{15}$$

Haga, Yoshinori; Sugai, Takashi*; Matsumoto, Yuji*; Yamamoto, Etsuji

JPS Conference Proceedings (Internet), 29, p.013003_1 - 013003_5, 2020/02

https://doi.org/10.7566/JPSCP.29.013003

Journal Articles

Heavy fermion state of YbNi$$_2$$Si$$_3$$ without local inversion symmetry

Nakamura, Shota*; Hyodo, Kazushi*; Matsumoto, Yuji*; Haga, Yoshinori; Sato, Hitoshi*; Ueda, Shigenori*; Mimura, Kojiro*; Saiki, Katsuyoshi*; Iso, Kosei*; Yamashita, Minoru*; et al.

Journal of the Physical Society of Japan, 89(2), p.024705_1 - 024705_5, 2020/02

https://doi.org/10.7566/JPSJ.89.024705
 Times Cited Count：2 Percentile：21.72(Physics, Multidisciplinary)

Journal Articles

Crystallographic, magnetic, thermal, and electric transport properties in UPtIn single crystal

Matsumoto, Yuji*; Haga, Yoshinori; Tateiwa, Naoyuki; Yamamoto, Etsuji; Fisk, Z.*

Journal of the Physical Society of Japan, 87(2), p.024706_1 - 024706_4, 2018/02

https://doi.org/10.7566/JPSJ.87.024706
 Times Cited Count：0 Percentile：0(Physics, Multidisciplinary)

Journal Articles

Electronic structure of ThRu$$_2$$Si$$_2$$ studied by angle-resolved photoelectron spectroscopy; Elucidating the contribution of U 5$$f$$ states in URu$$_{2}$$Si$$_{2}$$

Fujimori, Shinichi; Kobata, Masaaki; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi; Yamagami, Hiroshi; Matsumoto, Yuji*; Yamamoto, Etsuji; Tateiwa, Naoyuki; et al.

Physical Review B, 96(12), p.125117_1 - 125117_9, 2017/09

https://doi.org/10.1103/PhysRevB.96.125117
 Times Cited Count：10 Percentile：45.59(Materials Science, Multidisciplinary)

Journal Articles

Magnetoresistance and Hall effect of antiferromagnetic uranium compound URhIn$$_5$$

Haga, Yoshinori; Matsumoto, Yuji*; Pospisil, J.; Tateiwa, Naoyuki; Yamamoto, Etsuji; Yamamura, Tomoo*; Fisk, Z.*

Journal of Physics; Conference Series, 807(1), p.012015_1 - 012015_4, 2017/04

https://doi.org/10.1088/1742-6596/807/1/012015
 Times Cited Count：1 Percentile：34(Physics, Condensed Matter)

Journal Articles

Fermi surface of ThRu$$_{2}$$Si$$_{2}$$ as a reference to the strongly correlated isostructural metals investigated by quantum oscillations

Matsumoto, Yuji*; Haga, Yoshinori; Tateiwa, Naoyuki; Aoki, Haruyoshi*; Kimura, Noriaki*; Yamamura, Tomoo*; Yamamoto, Etsuji; Matsuda, Tatsuma*; Fisk, Z.*; Yamagami, Hiroshi*

Journal of the Physical Society of Japan, 85(10), p.104709_1 - 104709_7, 2016/10

https://doi.org/10.7566/JPSJ.85.104709
 Times Cited Count：2 Percentile：20.11(Physics, Multidisciplinary)

Journal Articles

Magnetic and electronic properties of URu$$_2$$Si$$_2$$ revealed by comparison with nonmagnetic references ThRu$$_2$$Si$$_2$$ and LaRu$$_2$$Si$$_2$$

Emi, Naoya*; Hamabata, Ryosuke*; Nakayama, Daisuke*; Miki, Toshihiro*; Koyama, Takehide*; Ueda, Koichi*; Mito, Takeshi*; Kohori, Yo*; Matsumoto, Yuji*; Haga, Yoshinori; et al.

Journal of the Physical Society of Japan, 84(6), p.063702_1 - 063702_4, 2015/06

https://doi.org/10.7566/JPSJ.84.063702
 Times Cited Count：10 Percentile：58.29(Physics, Multidisciplinary)

Journal Articles

Enhancement of the cyclotron effective mass in U$$_{0.03}$$Th$$_{0.97}$$Ru$$_2$$Si$$_2$$

Haga, Yoshinori; Matsumoto, Yuji*; Tateiwa, Naoyuki; Yamamoto, Etsuji; Kimura, Noriaki*; Yamamura, Tomoo*; Fisk, Z.

Journal of Physics; Conference Series, 592(1), p.012036_1 - 012036_5, 2015/03

https://doi.org/10.1088/1742-6596/592/1/012036
 Times Cited Count：2 Percentile：60.83(Physics, Atomic, Molecular & Chemical)

Journal Articles

Electronic states in antiferromagnetic compound URhIn$$_5$$ investigated by de Haas-van Alphen effect and high pressure resistivity measurements

Matsumoto, Yuji; Haga, Yoshinori; Tateiwa, Naoyuki; Yamamoto, Etsuji; Kimura, Noriaki*; Aoki, Haruyoshi*; Fisk, Z.

JPS Conference Proceedings (Internet), 3, p.011097_1 - 011097_5, 2014/06

Journal Articles

Single-crystal growth and de Haas-van Alphen effect study of ThRu$$_2$$Si$$_2$$

Matsumoto, Yuji*; Haga, Yoshinori; Tateiwa, Naoyuki; Aoki, Haruyoshi*; Kimura, Noriaki*; Matsuda, Tatsuma*; Yamamoto, Etsuji; Fisk, Z.; Yamagami, Hiroshi*

JPS Conference Proceedings (Internet), 3, p.011096_1 - 011096_5, 2014/06

https://doi.org/10.7566/JPSCP.3.011096

Journal Articles

$$^{29}$$Si-NMR study of antiferromagnet CeRh$$_2$$Si$$_2$$ using single crystals

Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Matsumoto, Yuji; Matsuda, Tatsuma; Haga, Yoshinori

Journal of the Korean Physical Society, 63(3), p.352 - 355, 2013/08

https://doi.org/10.3938/jkps.63.352
 Times Cited Count：4 Percentile：33.58(Physics, Multidisciplinary)

$$^{29}$$Si-NMR Study of antiferromagnet CeRh$$_2$$Si$$_2$$ with a tetragonal ThCr$$_2$$Si$$_2$$-type structure has been performed using single crystals. The Knight shifts along the $$a$$ and $$c$$ axes have been measured as a function of temperatures in the paramagnetic state. At ambient pressure, the Knight shifts show the Ising-type anisotropy along the $$c$$ axis, which is similar to the magnetic susceptibility. The hyperfine coupling constants for $$^{29}$$Si along the $$a$$ and $$c$$ axes have been determined from Knight shifts versus static susceptibility plots.

Journal Articles

Single crystal growth and physical properties of UT$$_2$$Al$$_{20}$$ (T = transition metal)

Matsumoto, Yuji; Matsuda, Tatsuma; Tateiwa, Naoyuki; Yamamoto, Etsuji; Haga, Yoshinori; Fisk, Z.

Journal of the Korean Physical Society, 63(3), p.363 - 366, 2013/08

https://doi.org/10.3938/jkps.63.363
 Times Cited Count：8 Percentile：50.63(Physics, Multidisciplinary)

Journal Articles

Single-crystal growth and physical properties of URhIn$$_5$$

Matsumoto, Yuji*; Haga, Yoshinori; Tateiwa, Naoyuki; Sakai, Hironori; Matsuda, Tatsuma; Yamamoto, Etsuji; Fisk, Z.

Physical Review B, 88(4), p.045120_1 - 045120_6, 2013/07

https://doi.org/10.1103/PhysRevB.88.045120
 Times Cited Count：7 Percentile：33.24(Materials Science, Multidisciplinary)

Journal Articles

Zero-field NMR and NQR measurements of the antiferromagnets URhIn$$_{5}$$

Sakai, Hironori; Kambe, Shinsaku; Tokunaga, Yo; Matsumoto, Yuji; Tateiwa, Naoyuki; Haga, Yoshinori; Fisk, Z.

Physical Review B, 88(4), p.045123_1 - 045123_8, 2013/07

https://doi.org/10.1103/PhysRevB.88.045123
 Times Cited Count：5 Percentile：25.14(Materials Science, Multidisciplinary)

The antiferromagnet URhIn$$_{5}$$ with the N$'e$el temperature $$T_{rm N}=98$$ K has been investigated by nuclear magnetic/quadrupole resonance (NMR/NQR). $$^{115}$$In-NQR spectra in the paramagnetic state give the respective electrical field gradient parameters for the locally tetragonal and orthorhombic In(1) and In(2) sites. In the antiferromagnetic state at 4.5 K, $$^{115}$$In-NMR spectra in zero external field indicate a commensurate antiferromagnetic structure. The internal field at In(1) sites is found to be zeroand that at In(2) sites is 21.1 kOe at 4.5 K. The temperature ($$T$$) dependence of the nuclear relaxation rates $$1/T_1$$ in the paramagnetic state shows a distinct site-dependence: Korringa-like constant $$(T_1T)^{-1}$$ behavior below $$sim$$150 K for In(1) sites and a divergent behavior of $$1/T_1$$ toward $$T_{rm N}$$ for In(2). The plausible antiferromagnetic structure is discussed based on these observations.

Journal Articles

Delocalization of the $$f$$ electron in Ce$$_x$$La$$_{1-x}$$Ru$$_2$$Si$$_2$$; The de Haas-van Alphen effect measurement

Matsumoto, Yuji; Kimura, Noriaki*; Komatsubara, Takemi*; Aoki, Haruyoshi*; Kurita, Nubuyuki*; Terashima, Taichi*; Uji, Shinya*

Journal of Physics; Conference Series, 391, p.012042_1 - 012042_4, 2012/12

https://doi.org/10.1088/1742-6596/391/1/012042
 Times Cited Count：1 Percentile：43.5(Physics, Multidisciplinary)

CeRu$$_2$$Si$$_2$$ is a paramagnetic heavy fermion compound with the electronic specific heat coefficient $$gamma$$ of 350 mJ/mol K$$^2$$. When a magnetic field is applied along the [001] direction of its tetragonal ThCr$$_2$$Si$$_2$$ structure, it exhibits metamagnetic transition at 7.7 T. On the other hand, when a magnetic field is applied in the (001) plane, metamagnetic transition does not occur. This magnetic anisotropy is maintained to lower Ce concentration samples. By replacing Ce with La, CeRu$$_2$$Si$$_2$$ changes to antiferromagnet at $$x_c$$ $$sim$$ 0.91 and finally to normal paramagnet of LaRu$$_2$$Si$$_2$$. In very low Ce concentration samples, the impurity Kondo effect is observed. The Kondo temperature of the $$x$$ = 0.02 sample is about 1 K. We have successfully observed all the dHvA oscillations in the dilute Ce concentration samples with fields in the (001) plane. Moreover, we have observed the variation of the dHvA oscillations with temperature crossing the Kondo temperature.

Journal Articles

Magnetic behavior near the boundary of 4$$f$$ delocalization in ferromagnetic CeRu$$_2$$Ge$$_2$$ and paramagnetic CeRu$$_2$$Si$$_2$$ observed by Ce $$M_{4,5}$$ XAS and XMCD

Okane, Tetsuo; Takeda, Yukiharu; Yamagami, Hiroshi; Fujimori, Atsushi; Matsumoto, Yuji; Kimura, Noriaki*; Komatsubara, Takemi*; Aoki, Haruyoshi*

Physical Review B, 86(12), p.125138_1 - 125138_11, 2012/09

https://doi.org/10.1103/PhysRevB.86.125138
 Times Cited Count：12 Percentile：46.48(Materials Science, Multidisciplinary)

74 (Records 1-20 displayed on this page)