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Metoki, Naoto; Shibata, Kaoru; Matsuura, Masato*; Kitazawa, Hideaki*; Suzuki, Hiroyuki*; Yamauchi, Hiroki; Hagihara, Masato; Frontzek, M. D.*; Matsuda, Masaaki*
Journal of the Physical Society of Japan, 91(5), p.054710_1 - 054710_6, 2022/05
Times Cited Count:0 Percentile:0.00(Physics, Multidisciplinary)Hyperfine splitting of Nd nuclei in NdPdAl
has been studied by means of high-resolution neutron spectroscopy. We observed inelastic peaks at
eV coming from the hyperfine splitting in the magnetically ordered phase due to the hyperfine interactions between Nd nuclei (
=7/2) and the 4
electrons with
ground state composed of mainly
. At very low temperatures, nuclear spin of Nd is polarized with increasing occupation probability of low energy levels and contributes to the enhancement of the antiferromagnetic Bragg intensities: the elastic non-spin-flip channel is dominant. As an application of this phenomenon, we determined the Nd moment and hyperfine splitting from the temperature dependence of an antiferromagnetic Bragg intensities for Nd
Pd
Ge
.
Kuroda, Kenta*; Arai, Yosuke*; Rezaei, N.*; Kunisada, So*; Sakuragi, Shunsuke*; Alaei, M.*; Kinoshita, Yuto*; Bareille, C.*; Noguchi, Ryo*; Nakayama, Mitsuhiro*; et al.
Nature Communications (Internet), 11, p.2888_1 - 2888_9, 2020/06
Times Cited Count:21 Percentile:75.52(Multidisciplinary Sciences)Metoki, Naoto; Aczel, A. A.*; Aoki, Dai*; Chi, S.*; Fernandez-Baca, J. A.*; Griveau, J.-C.*; Hagihara, Masato*; Hong, T.*; Haga, Yoshinori; Ikeuchi, Kazuhiko*; et al.
JPS Conference Proceedings (Internet), 30, p.011123_1 - 011123_6, 2020/03
Rare earths (4) and actinides (5
) provide variety of interesting states realized with competing interactions between the increasing number of
electrons. Since crystal field splitting of many-body
electron system is smaller than the bandwidth, (1) high resolution experiments are needed, (2) essentially no clear spectrum with well defined peaks is expected in itinerant Ce and U compounds, and (3) Np and Pu is strictly regulated. Therefore, systematic research on magnetic excitations by neutron scattering experiments of localized compounds and rare earth iso-structural reference is useful. We describe the
electron states of heavy electron compounds NpPd
Al
and actinide and rare earth based iso-structural family.
Metoki, Naoto; Yamauchi, Hiroki; Suzuki, Hiroyuki*; Kitazawa, Hideaki*; Hagihara, Masato*; Masuda, Takatsugu*; Aczel, A. A.*; Chi, S.*; Hong, T.*; Matsuda, Masaaki*; et al.
Journal of the Physical Society of Japan, 87(9), p.094704_1 - 094704_8, 2018/09
Times Cited Count:6 Percentile:46.04(Physics, Multidisciplinary)The -electron states of PrPd
Al
were revealed by neutron inelastic scattering. The flat
-orbitals with large
become stable under the two-dimensional CEF potential of unique crystal structure, which is the origin of the Ising anisotropy. A systematic understanding is possible in RPd
Al
based on this CEF potential. Especially the
-type anisotropy in NpPd
Al
can be qualitatively understood with the positive Stevens factors. It mean that the local property is important for the physical properties of RPd
Al
including the heavy fermion superconductivity in NpPd
Al
.
Metoki, Naoto; Yamauchi, Hiroki; Kitazawa, Hideaki*; Suzuki, Hiroyuki*; Hagihara, Masato*; Frontzek, M. D.*; Matsuda, Masaaki*; Fernandez-Baca, J. A.*
Journal of the Physical Society of Japan, 86(3), p.034710_1 - 034710_5, 2017/03
Times Cited Count:9 Percentile:56.46(Physics, Multidisciplinary)Magnetic structure of NdPdAl
has been studied by means of neutron powder diffraction. We observed remarkable magnetic reflections with the modulation vector
= (1/2 0 0) below the ordering temperature
= 1.2 K. We found a collinear magnetic structure of Nd moment of 2.9(1)
at 0.3 K parallel to the
-axis, where the ferromagnetically ordered
planes stack with four Nd layer period of ++-- sequence along the
direction with the distance between adjuscent Nd layers to be
. This is very similar to CePd
Al
with
= (0.23 0.23 0) and the Ce moment parallel to the
-axis. These structures with in-plane modulation
is a consequence of the two dimensional nature of fermi surface topology in this family, coming from unique crystal structure with very long tetragonal unit cell and large distance
7
between the rare earth layers separated by Al and two Pd layers.
Nigo, Seisuke*; Kubota, Masato; Harada, Yoshitomo*; Hirayama, Taisei*; Kato, Seiichi*; Kitazawa, Hideaki*; Kido, Giyu*
Journal of Applied Physics, 112(3), p.033711_1 - 033711_6, 2012/08
Times Cited Count:61 Percentile:89.27(Physics, Applied)Onuma, Masato*; Suzuki, Junichi; Otsuka, Satoshi; Kim, S.-W.; Kaito, Takeji; Inoue, Masaki; Kitazawa, Hideaki*
Acta Materialia, 57(18), p.5571 - 5581, 2009/10
Times Cited Count:117 Percentile:97.20(Materials Science, Multidisciplinary)Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Ishikawa, Norito; Tazawa, Masato*; Kakiuchida, Hiroshi*
Nuclear Instruments and Methods in Physics Research B, 266(12-13), p.2986 - 2989, 2008/06
Times Cited Count:8 Percentile:50.17(Instruments & Instrumentation)Irradiation effects of CuO irradiated with 100 MeV Xe ions were studied. X-ray diffraction intensity and optical properties were analyzed.
Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Tazawa, Masato*
Nuclear Instruments and Methods in Physics Research B, 256(1), p.333 - 336, 2007/03
Times Cited Count:15 Percentile:70.11(Instruments & Instrumentation)no abstracts in English
Fukuoka, Osamu*; Matsunami, Noriaki*; Tazawa, Masato*; Shimura, Tetsuo*; Sataka, Masao; Sugai, Hiroyuki; Okayasu, Satoru
Nuclear Instruments and Methods in Physics Research B, 250(1-2), p.295 - 299, 2006/09
Times Cited Count:24 Percentile:82.87(Instruments & Instrumentation)We have investigated the effects on electrical and optical properties of Al-doped ZnO (AZO) semiconductor films induced by high-energy heavy ion. The AZO films with c-axis on SiO glass substrate were prepared by a RF-sputter-deposition method at 400
C. Rutherford backscattering spectroscopy shows that the Al/Zn composition and the film thickness are 4 % and 0.3
m. No appreciable change was observed in optical transparency. We find that the conductivity monotonically increases from 1.5
10
to 8
10
S/cm with increasing the fluence up to 4
10
/cm
, as already been observed for 100 keV Ne irradiation. The fluence of 100 keV Ne at which the conductivity takes its maximum is 3
10
/cm
(7 dpa). The dpa of 100 MeV Xe at 4
10
/cm
is estimated as 0.008. Hence, the conductivity increase by 100 MeV Xe ion is ascribed to the electronic excitation effects.
Sugai, Hiroyuki; Matsunami, Noriaki*; Fukuoka, Osamu*; Sataka, Masao; Kato, Teruo; Okayasu, Satoru; Shimura, Tetsuo*; Tazawa, Masato*
Nuclear Instruments and Methods in Physics Research B, 250(1-2), p.291 - 294, 2006/09
Times Cited Count:15 Percentile:70.33(Instruments & Instrumentation)We have investigated the effects on electrical properties of Al-doped ZnO (AZO) semiconductor films induced by high-energy heavy ion. The AZO films with c-axis on SiO glass substrate were prepared by a RF-sputter-deposition method at 400
C. Rutherford backscattering spectroscopy shows that the Al/Zn composition and the film thickness are 4 % and 0.3
m. We find that the conductivity monotonically increases from 1.5
10
to 8
10
S/cm with increasing the fluence up to 4
10
/cm
, as already been observed for 100 keV Ne irradiation. The fluence of 100 keV Ne at which the conductivity takes its maximum is 3
10
/cm
(7 dpa). The dpa of 100 MeV Xe at 4
10
/cm
is estimated as 0.008. Hence, the conductivity increase by 100 MeV Xe ion is ascribed to the electronic excitation effects.
Shinde, N.*; Matsunami, Noriaki*; Tazawa, Masato*; Sataka, Masao; Chimi, Yasuhiro
Transactions of the Materials Research Society of Japan, 31(3), p.709 - 712, 2006/09
no abstracts in English
Matsunami, Noriaki*; Ito, Masaharu*; Takai, Yoshiaki*; Tazawa, Masato*; Sataka, Masao
Nuclear Instruments and Methods in Physics Research B, 206, p.282 - 286, 2003/05
Times Cited Count:23 Percentile:80.59(Instruments & Instrumentation)no abstracts in English
Tonomura, A.*; Hasai, H.*; Kamimura, O.*; Matsuda, T.*; Harada, K.*; Nakayama, Y.*; Shimoyama, J.*; Kishio, K.*; Hanaguri, T.*; Kitazawa, K.*; et al.
Nature, 412(6847), p.620 - 622, 2001/08
Times Cited Count:104 Percentile:94.29(Multidisciplinary Sciences)Direct observation microscopically elucidated the behaviour of vortices in Bi-2212 thin films. The isotropic pinning of vortices by columnar defects at low magnetic fields indirectly inferred by macroscopic magnetization measurements can be explained microscopically as follows; vortex lines are trapped along columns ate temperatures above 19K irrespective of the direction of the applied magnetic field; and at temperatures below 12K vortex lines always penetrate the film perpendicularly to the film plane owing to the increased background pinning compared to the columnar-defect pinning and also because of the demagnetization effect of thin film.
Metoki, Naoto; Yamauchi, Hiroki; Kitazawa, Hideaki*; Suzuki, Hiroyuki*; Hagihara, Masato*; Frontzek, M. D.*; Matsuda, Masaaki*; Fernandez-Baca, J. A.*
no journal, ,
Magnetic structure of NdPdAl
has been studied by means of neutron powder diffraction. We observed remarkable magnetic reflections with the modulation vector
= (1/2 0 0) below the ordering temperature
= 1.2 K. We found a collinear magnetic structure of Nd moment of 2.9(1)
at 0.3 K parallel to the
-axis, where the ferromagnetically ordered
planes stack with four Nd layer period of ++-- sequence along the
direction with the distance between adjuscent Nd layers to be
. This is very similar to CePd
Al
with
= (0.23 0.23 0) and the Ce moment parallel to the
-axis. These structures with in-plane modulation
is a consequence of the two dimensional nature of fermi surface topology in this family, coming from unique crystal structure with very long tetragonal unit cell and large distance
7
between the rare earth layers separated by Al and two Pd layers.
Metoki, Naoto; Yamauchi, Hiroki; Kitazawa, Hideaki*; Suzuki, Hiroyuki*; Hagihara, Masato*; Frontzek, M. D.*; Matsuda, Masaaki*; Fernandez-Baca, J. A.*
no journal, ,
Magnetic structure of NdPdAl
has been studied by means of neutron powder diffraction. We observed remarkable magnetic reflections with the modulation vector
= (1/2 0 0) below the ordering temperature
= 1.2 K. We found a collinear magnetic structure of Nd moment of 2.9(1)
at 0.3 K parallel to the
-axis, where the ferromagnetically ordered
planes stack with four Nd layer period of ++-- sequence along the
direction with the distance between adjacent Nd layers to be
. This is very similar to CePd
Al
with
= (0.23 0.23 0) and the Ce moment parallel to the
-axis. These structures with in-plane modulation
is a consequence of the two dimensional nature of fermi surface topology in this family, coming from unique crystal structure with very long tetragonal unit cell and large distance
7
between the rare earth layers separated by Al and two Pd layers.
Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Yamaguchi, Mitsutaka; Tanoi, Keitaro*; Nakanishi, Tomoko*; Chino, Mitsuo*; Nakamura, Shinichi*; Watabe, Hiroshi*; Yamamoto, Seiichi*; et al.
no journal, ,
no abstracts in English
Kakurai, Kazuhisa; Wakimoto, Shuichi; Matsuda, Masaaki*; Ishiwata, Shintaro*; Okuyama, Daisuke*; Taguchi, Yasujiro*; Tokura, Yoshiki*; Nishi, Masakazu*; Nakajima, Taro*; Mitsuda, Setsuo*; et al.
no journal, ,
Matsunami, Noriaki*; Kakiuchida, Hiroshi*; Tazawa, Masato*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki
no journal, ,
no abstracts in English
Metoki, Naoto; Yamauchi, Hiroki; Kitazawa, Hideaki*; Suzuki, Hiroyuki*; Hagihara, Masato*; Masuda, Takatsugu*; Matsuda, Masaaki*; Aczel, A. A.*; Songxue, C.*; Hong, T.*; et al.
no journal, ,
In order to elucidate the 5-electron states in the heavy electron superconductor NpPd
Al
, neutron scattering experiments of the rare earth based iso-structural family have been carried out. The observed crystal field excitations of PrPd
Al
and NdPd
Al
were analyzed via the crystal field Hamiltonian with tetragonal symmetry, diagonalized analytically. The experimentally obtained crystal field parameters
were very similar in CePd
Al
, PrPd
Al
, and NdPd
Al
, indicating a common effective charge potential in this series. We succeeded to clarify the 5
electron states of NpPd
Al
and UPd
Al
in comparison with these results.