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; Magnetic-quadrupole couplingMetoki, Naoto; Yamauchi, Hiroki; Watanuki, Ryuta*
Kotai Butsuri, 60(9), p.493 - 505, 2025/09
Inelastic neutron scattering experiments were carried out to understand the unusual successive order in NdB with the frustrated Shatry-Sutherland (SS) lattice. The pseudo-quartet with 
and 
splits into four levels in the magnetically ordered states. The spectra can be explained with the on-site magnetic interaction 
, the coupling of 
with quadrupole 
, and the uniaxial crystalline electric field. The 
-electron states reproduce the temperature dependences of the in-plane moment 
which is the primary order parameter, and a weakly induced 
as the secondary order parameter. The magnetic-quadrupole coupling emerges and play essential role under the geometrical frustration, where the Heisenberg interactions are cancelled out.
Yamakawa, Koichiro
Kotai Butsuri, 60(7), p.341 - 356, 2025/07
Molecules including identical nuclei with non-zero spin in the rotationally symmetric positions are classified into the nuclear spin isomers. The conversion between the isomers is prohibited in the isolated state, but is promoted in condensed systems, where molecules perform hindered rotation. In this review, I expound the coupling between the nuclear spin isomers and rotational states, and demonstrate some experimental studies on the nuclear spin conversion in molecular solids.
SRIto, Takashi; Kadono, Ryosuke*
Kotai Butsuri, 60(4), p.197 - 206, 2025/04
We extended the dynamical Kubo-Toyabe model to resolve inconsistencies in a conventional protocol for SR-based analysis of ion dynamics in solids. Our new model not only provides a means for quantitative analysis based on the immobile-muon assumption, but also offers a method to evaluate the validity of this assumption.
Ieda, Junichi; Araki, Yasufumi; Yamane, Yuta*
Kotai Butsuri, 59(8), p.403 - 410, 2024/08
; Improvement of 
and multiple superconducting phase diagramSakai, Hironori; Haga, Yoshinori
Kotai Butsuri, 58(10), p.529 - 536, 2023/10
We have succeeded to grow high-quality UTe single crystals with excess uranium through molten salt flux method. We have also studied the superconducting phase diagram using the high-quality crystal applying the fields up to 25 T along the magnetic hard 
axis.
Sumida, Kazuki; Sakuraba, Yuya*; Kimura, Akio*
Kotai Butsuri, 58(3), p.117 - 137, 2023/03
no abstracts in English
Nakata, Koki
Kotai Butsuri, 56(8), p.429 - 439, 2021/08
We review the thermomagnetic relation of bosons, the Wiedemann-Franz law for magnon transport, and discuss the universality.
Nagai, Yuki
Kotai Butsuri, 56(3), p.145 - 152, 2021/03
no abstracts in English
2
3 and their derivativesKakihana, Masashi*; Takeuchi, Tetsuya*; Haga, Yoshinori; Harima, Hisatomo*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*
Kotai Butsuri, 55(10), p.505 - 514, 2020/10
no abstracts in English
Chudo, Hiroyuki; Imai, Masaki
Kotai Butsuri, 55(9), p.435 - 443, 2020/09
no abstracts in English
-electron states of NpPd
Al and the isostructural family; Heavy fermion superconductivity accompanied by valence crossoverMetoki, Naoto
Kotai Butsuri, 55(7), p.285 - 296, 2020/07
Electron states are the main theme of "solid-state physics", which is essential for microscopic understanding of multipoles and superconductivity, etc. 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.
electron magnet EuPtSiKaneko, Koji; Kakihana, Masashi*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*
Kotai Butsuri, 54(12), p.757 - 766, 2019/12
no abstracts in English
Ishii, Kenji
Kotai Butsuri, 51(2), p.79 - 92, 2016/02
Mitamura, Hiroyuki*; Watanuki, Ryuta*; Kaneko, Koji; Sakakibara, Toshiro*
Kotai Butsuri, 50(12), p.821 - 832, 2015/12
no abstracts in English
Matsuo, Mamoru; Ieda, Junichi; Maekawa, Sadamichi
Kotai Butsuri, 49(11), p.611 - 625, 2014/11
no abstracts in English
Tamegai, Tsuyoshi*; Adachi, Tadashi*; Nagai, Yuki
Kotai Butsuri, 47(12), p.779 - 784, 2012/12
no abstracts in English
Si with an itinerant electron pictureIkeda, Hiroaki*; Suzuki, Michito
Kotai Butsuri, 47(11), p.693 - 706, 2012/11
no abstracts in English
Ieda, Junichi; Maekawa, Sadamichi
Kotai Butsuri, 47(8), p.339 - 353, 2012/08
The mutual interaction between spin current and magnetization is a key phenomenon in spintronics. This interaction leads to a spinmotive force, a mechanism of energy-transfer from magnetization into conduction electrons. In this review, the basic concepts and recent developments of the spinmotive force are introduced.
Tateiwa, Naoyuki; Haga, Yoshinori
Kotai Butsuri, 46(12), p.791 - 799, 2011/12
A miniature opposed-anvil high-pressure cell has been developed for magnetic measurement in a commercial superconducting quantum interference device (SQUID) magnetometer. The maximum pressure 
depends on the culet size of the anvil: the values of are 2.4 and 7.6 GPa for 1.8 and 0.6 mm culet anvils, respectively. We revealed that the composite ceramic anvil has potential to generate high pressure above 5 GPa. The background magnetization of the Cu-Be gasket is generally two orders of magnitude smaller than the Ni-Cr-Al gasket for the indenter cell. The present cell can be used not only with ferromagnetic and superconducting materials with large magnetization but also with antiferromagnetic compounds with smaller magnetization.
Oe, Junichiro; Gu, B.; Maekawa, Sadamichi
Kotai Butsuri, 45(5), p.269 - 278, 2010/06
We report a new combined numerical approach for studying diluted magnetic semiconductors (DMS). In this approach, realistic parameters obtained by the 
calculation are used for performing quantum Monte Carlo calculations. We show that the proposed approach well describes the magnetic properties of DMS and can be used for designing the new DMS materials which has high Curie temperatures.
