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Journal Articles

Magnonic Wiedemann-Franz law

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.

Journal Articles

On the crystal structure of compounds belonging to space group $$P$$2$$_1$$3 and their derivatives

Kakihana, 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

Journal Articles

$$f$$-electron states of NpPd$$_5$$Al$$_2$$ and the isostructural family; Heavy fermion superconductivity accompanied by valence crossover

Metoki, 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$$f$$) and actinides (5$$f$$) provide variety of interesting states realized with competing interactions between the increasing number of $$f$$ electrons. Since crystal field splitting of many-body $$f$$ 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 $$f$$ electron states of heavy electron compounds NpPd$$ _5$$Al$$_2$$ and actinide and rare earth based iso-structural family.

Journal Articles

Magnetic skyrmion lattice in 4$$f$$ electron magnet EuPtSi

Kaneko, Koji; Kakihana, Masashi*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*

Kotai Butsuri, 54(12), p.757 - 766, 2019/12

no abstracts in English

Journal Articles

Resonant inelastic X-ray scattering studies in strongly correlated electron systems

Ishii, Kenji

Kotai Butsuri, 51(2), p.79 - 92, 2016/02

Journal Articles

The Spin chirality and ferroelectricity on a triangular lattice antiferromagnet

Mitamura, Hiroyuki*; Watanuki, Ryuta*; Kaneko, Koji; Sakakibara, Toshiro*

Kotai Butsuri, 50(12), p.821 - 832, 2015/12

no abstracts in English

Journal Articles

Spins tangled with a deformed spacetime; New development in spintronics

Matsuo, Mamoru; Ieda, Junichi; Maekawa, Sadamichi

Kotai Butsuri, 49(11), p.611 - 625, 2014/11

no abstracts in English

Journal Articles

Reports for the 10th International Conference M2S

Tamegai, Tsuyoshi*; Adachi, Tadashi*; Nagai, Yuki

Kotai Butsuri, 47(12), p.779 - 784, 2012/12

no abstracts in English

Journal Articles

Hidden order of URu$$_2$$Si$$_2$$ with an itinerant $$f$$ electron picture

Ikeda, Hiroaki*; Suzuki, Michito

Kotai Butsuri, 47(11), p.693 - 706, 2012/11

no abstracts in English

Journal Articles

Spinmotive force; Basic concepts and developments

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.

Journal Articles

Ceramic anvil high pressure cell (mCAC) for magnetic measurements

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 $$P_{rm max}$$ depends on the culet size of the anvil: the values of $$P_{rm max}$$ 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.

Journal Articles

New numerical approach for studying diluted magnetic semiconductors

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 ${it ab initio}$ 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.

Journal Articles

Evaluation of pressure-transmitting media for cryogenic experiments

Tateiwa, Naoyuki; Haga, Yoshinori

Kotai Butsuri, 45(4), p.225 - 234, 2010/04

We have evaluated the fourteen kinds of pressure-transmitting media fro cryogenic experiments with the diamond anvil cell. The non-hydrostaticity of the pressure was evaluated from the value of the width of the ruby $$R_1$$ line at 10 GPa and 77 K. The media were classified into three groups from the value. It was found that the argon, nitrogen and helium provide the good hydrostatic pressure even in the low temperature region.

Journal Articles

New technique for inelastic neutron scattering measurement demonstrated on the chopper spectrometer 4SEASONS at J-PARC

Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Mizuno, Fumio; Yokoo, Tetsuya*; Nakatani, Takeshi; Arai, Masatoshi; Fujita, Masaki*

Kotai Butsuri, 45(2), p.79 - 89, 2010/02

Inelastic neutron scattering measurement using multiple incident energies can drastically enhances the measurement efficiency. The article reviews the principle of this new technique and an example of the measurement using the chopper spectrometer 4SEASONS of the pulsed neutron experimental facility in Japan Proton Accelerator Research Complex (J-PARC).

Journal Articles

Superconductivity in CeIrSi$$_3$$ realized at the quantum critical point

Settai, Rikio*; Kawai, Tomoya*; Miyauchi, Yuichiro*; Okuda, Yusuke*; Onuki, Yoshichika; Takeuchi, Tetsuya*; Tateiwa, Naoyuki; Matsuda, Tatsuma; Haga, Yoshinori; Harima, Hisatomo*

Kotai Butsuri, 43(8), p.459 - 474, 2008/08

The magnetic transition temperature of an antiferromagnet CeIrSi$$_3$$ decreases with increasing hydrostatic pressure, and finally superconductivity appears. An exotic superconducting symmetry is expected because of the absence of the inversion center in the crystal structure. One of the prominent features is the anomalously large upper critical field observed around the quantum critical point.

Journal Articles

The Frontiers of condensed matter science advanced by J-PARC

Fujii, Yasuhiko; Arai, Masatoshi; Kadono, Ryosuke*; Kanaya, Toshiji*; Kamiyama, Takashi*; Niimura, Nobuo*; Nojiri, Hiroyuki*; Noda, Yukio*; Yagi, Takehiko*; Yamada, Kazuyoshi*

Kotai Butsuri, 43(7), p.441 - 450, 2008/07

no abstracts in English

Journal Articles

Anisotropic superconductivity in NpPd$$_5$$Al$$_2$$ in the vicinity of the heavy fermion formation

Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu*; Haga, Yoshinori; Matsuda, Tatsuma; Tateiwa, Naoyuki; Ikeda, Shugo; Sakai, Hironori; Yamamoto, Etsuji; Nakamura, Akio; et al.

Kotai Butsuri, 42(9), p.569 - 580, 2007/09

The first neptunium superconductor was discovered in NpPd$$_5$$Al$$_2$$. Unconventional superconductivity of NpPd$$_5$$Al$$_2$$ is realized before onset of the heavy fermion state, which is compared with superconducting properties of CeCoIn$$_5$$ and PuRhGa$$_5$$ (PuCoGa$$_5$$).

Journal Articles

Multipolar ordering in NpO$$_2$$ probed by NMR

Tokunaga, Yo; Kambe, Shinsaku; Sakai, Hironori; Fujimoto, Tatsuya*; Ikeda, Shugo; Yamamoto, Etsuji; Nakamura, Akio; Walstedt, R. E.*; Yasuoka, Hiroshi; Homma, Yoshiya*; et al.

Kotai Butsuri, 42(4), p.241 - 252, 2007/04

We have initiated the first NMR measurements in the ordered state of NpO$$_2$$. From the angular dependence of hyperfine fields at $$^{17}$$O nuclei, we have obtained clear evidence for the appearance of field-induced antiferro-octupolar as well as field-induced antiferro-dipolar moments below T$$_0$$=26 K. The NMR studies provide definitive support for the proposed longitudinal triple-q antiferro-octupolar ordering model for NpO$$_2$$.

Journal Articles

Anecdote of single crystal growth on UCu$$_2$$Si$$_2$$

Matsuda, Tatsuma

Kotai Butsuri, 42(2), p.95 - 97, 2007/02

no abstracts in English

39 (Records 1-20 displayed on this page)