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Journal Articles

${it Ab initio}$ path-integral simulations of hydrogen-isotope diffusion in face-centred cubic metals

Kimizuka, Hajime*; Ogata, Shigenobu*; Thomsen, B.; Shiga, Motoyuki

Journal of Physics; Condensed Matter, 37(19), p.193001_1 - 193001_16, 2025/04

https://doi.org/10.1088/1361-648X/adc060
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

Calculations of hydrogen isotope diffusion coefficients for face-centred cubic lattice metals using ${it ab initio}$ path integral methods show that the temperature dependence of the diffusion coefficients has an unusual shape. This is due to the competition between nuclear quantum effects with different temperature dependence, which explains the unusual crossover mechanism between the normal and inverse isotope effects. We also present the results of a path integral simulation that describes approximate quantum dynamics using machine learning-based interatomic potentials with almost the same accuracy as density functional theory calculations. This computational method paves the way for understanding the quantum behaviour of hydrogen isotopes in various solid-state materials.

Journal Articles

Spin caloritronics in metallic superlattices

Seki, Takeshi*; Uchida, Kenichi*; Takanashi, Koki

Journal of Physics; Condensed Matter, 36(33), p.333001_1 - 333001_11, 2024/05

https://doi.org/10.1088/1361-648X/ad4761
 Times Cited Count：1 Percentile：12.05(Physics, Condensed Matter)

Journal Articles

Direct observation of concentration fluctuations in Au-Si eutectic liquid by small-angle neutron scattering

Sakaguchi, Yoshifumi*; Takata, Shinichi; Kawakita, Yukinobu; Fujimura, Yuki; Kondo, Keietsu

Journal of Physics; Condensed Matter, 35(41), p.415403_1 - 415403_11, 2023/10

https://doi.org/10.1088/1361-648X/ace577
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

Journal Articles

Local electronic structure of interstitial hydrogen in MgH$$_2$$ inferred from muon study

Kadono, Ryosuke*; Hiraishi, Masatoshi*; Okabe, Hirotaka*; Koda, Akihiro*; Ito, Takashi

Journal of Physics; Condensed Matter, 35(28), p.285503_1 - 285503_13, 2023/07

https://doi.org/10.1088/1361-648X/acccc7
 Times Cited Count：1 Percentile：10.32(Physics, Condensed Matter)

Journal Articles

Analyses of hydrogen local environments in metals and intermetallic compounds using inelastic neutron scattering calculations based on first-principles hydrogen adiabatic potentials

Tatsumi, Kazuyoshi; Okudaira, Takuya*; Kofu, Maiko; Rozyczko, P.*

Journal of Physics; Condensed Matter, 36(37), p.375901_1 - 375901_13, 2023/06

https://doi.org/10.1088/1361-648X/ad559b
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

Journal Articles

Virtual photon approach of cathodoluminescence and ion-beam induced luminescence of solids

Constantini, J.-M.*; Ogawa, Tatsuhiko; Gourier, D.*

Journal of Physics; Condensed Matter, 35(28), p.285701_1 - 285701_12, 2023/04

https://doi.org/10.1088/1361-648X/accb34
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

A novel analysis of luminescence is presented on the basis of virtual photon spectra (VPS) produced by charged particles (electrons or ions) passing by luminescent species such as defects or impurities, in wide band-gap ionic-covalent solids. The electron-energy dependence of experimental luminescence spectra of sapphire ($$alpha$$-Al$$_{2}$$O$$_{3}$$) is discussed in relation to the computed VPS for the primary and secondary electrons. The experimental luminescence spectra of $$alpha$$-Al$$_{2}$$O$$_{3}$$ are also analyzed in this framework for protons and helium ions in the MeV energy range. The variations of stopping power are consistent with the variation of the number of emitted VPs. The decay of luminescence yield versus ion stopping power is discussed on the basis of the variation of the computed VPS, and ionization and excitation induced by primary ions and secondary electrons. This decay is accounted for by a decrease of the yield of low-energy secondary electrons with the subsequent VP emission.

Journal Articles

Spin fluctuations in the 112-type iron-based superconductor Ca$$_{0.82}$$La$$_{0.18}$$Fe$$_{0.96}$$Ni$$_{0.04}$$As$$_{2}$$

Xie, T.*; Liu, C.*; Kajimoto, Ryoichi; Ikeuchi, Kazuhiko*; Li, S.*; Luo, H.*

Journal of Physics; Condensed Matter, 34(47), p.474001_1 - 474001_8, 2022/11

https://doi.org/10.1088/1361-648X/ac9441
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

Journal Articles

Unconventional superconductivity in UTe$$_2$$

Aoki, Dai*; Brison, J.-P.*; Flouquet, J.*; Ishida, Kenji*; Knebel, G.*; Tokunaga, Yo; Yanase, Yoichi*

Journal of Physics; Condensed Matter, 34(24), p.243002_1 - 243002_41, 2022/06

https://doi.org/10.1088/1361-648X/ac5863
 Times Cited Count：132 Percentile：90.46(Physics, Condensed Matter)

Journal Articles

Effect of uranium deficiency on normal and superconducting properties in unconventional superconductor UTe$$_2$$

Haga, Yoshinori; Opletal, P.; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Tokunaga, Yo; Kambe, Shinsaku; Sakai, Hironori

Journal of Physics; Condensed Matter, 34(17), p.175601_1 - 175601_7, 2022/04

https://doi.org/10.1088/1361-648X/ac5201
 Times Cited Count：29 Percentile：86.06(Physics, Condensed Matter)

Journal Articles

Nanoscale structural analysis of Pb(Mg$$_{1/3}$$Nb$$_{2/3}$$)O$$_3$$

Yoneda, Yasuhiro; Taniguchi, Hiroki*; Noguchi, Yuji*

Journal of Physics; Condensed Matter, 33(3), p.035401_1 - 035401_8, 2021/01

https://doi.org/10.1088/1361-648X/abb866
 Times Cited Count：4 Percentile：22.00(Physics, Condensed Matter)

Nanoscale structural analysis of relaxor Pb(Mg$$_{1/3}$$Nb$$_{2/3}$$)O$$_3$$ (PMN) was performed using synchrotron high-energy X-ray diffraction measurements. Although PMN is a well-known relaxor ferroelectric material, the average structure is a cubic structure, and various models have been proposed to explain the ferroelectric microstructure. We performed a wide-range local structure analysis up to 20 nm using the pair distribution function (PDF). As a result, it was found that the structure of PMN changed depending on the distance and it was a glass-like structure.

Journal Articles

Soft X-ray irradiation induced metallization of layered TiNCl

Kataoka, Noriyuki*; Tanaka, Masashi*; Hosoda, Wataru*; Taniguchi, Takumi*; Fujimori, Shinichi; Wakita, Takanori*; Muraoka, Yuji*; Yokoya, Takashi*

Journal of Physics; Condensed Matter, 33(3), p.035501_1 - 035501_6, 2021/01

https://doi.org/10.1088/1361-648X/abbbc3
 Times Cited Count：4 Percentile：22.00(Physics, Condensed Matter)

Journal Articles

Asymmetrically optimized structure in a high-$$T_{rm c}$$ single unit-cell FeSe superconductor

Fukaya, Yuki; Zhou, G.*; Zheng, F.*; Zhang, P.*; Wang, L.*; Xue, Q.-K.*; Shamoto, Shinichi

Journal of Physics; Condensed Matter, 31(5), p.055701_1 - 055701_6, 2019/02

https://doi.org/10.1088/1361-648X/aaf2d9
 Times Cited Count：7 Percentile：26.76(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Band structures of 4$$f$$ and 5$$f$$ materials studied by angle-resolved photoelectron spectroscopy

Fujimori, Shinichi

Journal of Physics; Condensed Matter, 28(15), p.153002_1 - 153002_31, 2016/04

https://doi.org/10.1088/0953-8984/28/15/153002
 Times Cited Count：39 Percentile：38.92(Physics, Condensed Matter)

Journal Articles

Theory of spin Hall magnetoresistance (SMR) and related phenomena

Chen, Y.-T.*; Takahashi, Saburo*; Nakayama, Hiroyasu*; Althammer, M.*; Goennenwein, S. T. B.*; Saito, Eiji; Bauer, G. E. W.*

Journal of Physics; Condensed Matter, 28(10), p.103004_1 - 103004_15, 2016/03

https://doi.org/10.1088/0953-8984/28/10/103004
 Times Cited Count：93 Percentile：61.66(Physics, Condensed Matter)

We review the so-called spin Hall magnetoresistance (SMR) in bilayers of a magnetic insulator and a metal, in which spin currents are generated in the normal metal by the spin Hall effect. The associated angular momentum transfer to the ferromagnetic layer and thereby the electrical resistance is modulated by the angle between the applied current and the magnetization direction. The SMR provides a convenient tool to non-invasively measure the magnetization direction and spin-transfer torque to an insulator. We introduce the minimal theoretical instruments to calculate the SMR, i.e. spin diffusion theory and quantum mechanical boundary conditions. This leads to a small set of parameters that can be fitted to experiments. We discuss the limitations of the theory as well as alternative mechanisms such as the ferromagnetic proximity effect and Rashba spin-orbit torques, and point out new developments.

Journal Articles

Phonons of Fe-based superconductor Ca$$_{10}$$Pt$$_4$$As$$_8$$(Fe$$_{1-x}$$Pt$$_x$$As)$$_{10}$$

Ikeuchi, Kazuhiko*; Kobayashi, Yoshiaki*; Suzukia, Kazunori*; Ito, Masayuki*; Kajimoto, Ryoichi; Bourges, P.*; Christianson, A. D.*; Nakamura, Hiroki; Machida, Masahiko; Sato, Masatoshi*

Journal of Physics; Condensed Matter, 27(46), p.465701_1 - 465701_7, 2015/11

https://doi.org/10.1088/0953-8984/27/46/465701
 Times Cited Count：3 Percentile：13.75(Physics, Condensed Matter)

We report the results of inelastic neutron scattering measurements on particular phonons of a superconducting (SC) Ca$$_{10}$$Pt$$_4$$As$$_8$$(Fe$$_{1-x}$$Pt$$_x$$As)$$_{10}$$ with the onset transition temperature $$T_c sim 33$$ K to investigate mainly what roles orbital fluctuation plays in Cooper pairing, where we observed a slight softening of the in-plane transverse acoustic mode corresponding to the elastic constant $$C_{66}$$. This softening starts at temperature $$T$$ well above the SC $$T_c$$, as $$T$$ decreases. An anomalously strong change of the scattering intensity of in-plane optical modes was observed at the M point of the pseudo tetragonal reciprocal space in the range of 35 $$< omega <$$ 40 meV with decreasing $$T$$ from far above $$T_c$$. Because this $$omega$$ region mainly corresponds to the motion of Fe and As atoms in the FeAs planes, the finding presents information on the coupling between the orbital fluctuation of Fe $$3d$$ electrons and the lattice system, useful for studying the possible roles of orbital fluctuation in the pairing mechanism and/or the appearance of the so-called nematic phase.

Journal Articles

Effect of magnetic field on positron lifetimes of Fe, Co and Ni

Li, H.; Maekawa, Masaki; Kawasuso, Atsuo; Tanimura, Naoki*

Journal of Physics; Condensed Matter, 27(24), p.246001_1 - 246001_5, 2015/06

https://doi.org/10.1088/0953-8984/27/24/246001
 Times Cited Count：7 Percentile：29.96(Physics, Condensed Matter)

Journal Articles

Longitudinal spin Seebeck effect; From fundamentals to applications

Uchida, Kenichi*; Ishida, Masahiko*; Kikkawa, Takashi*; Kirihara, Akihiro*; Murakami, Tomoo*; Saito, Eiji

Journal of Physics; Condensed Matter, 26(34), p.343202_1 - 343202_15, 2014/08

https://doi.org/10.1088/0953-8984/26/34/343202
 Times Cited Count：232 Percentile：84.79(Physics, Condensed Matter)

Journal Articles

Possible method to observe the breathing mode of a magnetic domain wall in the Josephson junction

Mori, Michiyasu; Koshibae, Wataru*; Hikino, Shinichi*; Maekawa, Sadamichi

Journal of Physics; Condensed Matter, 26(25), p.255702_1 - 255702_5, 2014/06

AA2014-0149.pdf:0.28MB

https://doi.org/10.1088/0953-8984/26/25/255702
 Times Cited Count：3 Percentile：13.77(Physics, Condensed Matter)

Journal Articles

Weak itinerant antiferromagnetism in PuIn$$_3$$ explored using $$^{115}$$In nuclear quadrupole resonance

Chudo, Hiroyuki; Koutroulakis, G.*; Yasuoka, Hiroshi; Bauer, E. D.*; Tobash, P. H.*; Mitchell, J. N.*; Thompson, J. D.*

Journal of Physics; Condensed Matter, 26(3), p.036001_1 - 036001_5, 2014/01

https://doi.org/10.1088/0953-8984/26/3/036001
 Times Cited Count：5 Percentile：22.43(Physics, Condensed Matter)

The results of $$^{115}$$In nuclear quadrupole resonance (NQR) measurements on PuIn$$_3$$ are reported. Three of the four NQR lines of $$^{115}$$In expected for nuclear spin $$I$$=9/2 are observed. The equal spacing of these lines at 20 K yields the NQR frequency of $$nu_{rm Q}$$=10.45 MHz, and the asymmetry parameter of the electric field gradient, $$eta$$=0. The NQR line profile and the nuclear spin-lattice relaxation rate $$1/T_1$$ display an abrupt change at 14 K, which is associated with the onset of long-range antiferromagnetic order. The temperature dependences of the staggered magnetization $$M_{rm Q}(T)$$, extracted from the NQR spectra, and $$1/T_1$$ below $$T_{rm N}$$=14 K are well explained by the self-consistent renormalization (SCR) theory for spin fluctuations. In addition, scaling between $$T_1T$$ and $$M_{rm Q}(T)/M_{rm Q}(0)$$ is also consistent with the predictions of SCR theory, providing further evidence that PuIn$$_3$$ is a weak itinerant antiferromagnet in which spin fluctuations around the antiferromagnetic wave vector play a major role in the system's behavior at finite temperatures.

Journal Articles

Quadrupole effects in tetragonal crystals PrCu$$_2$$Si$$_2$$ and DyCu$$_2$$Si$$_2$$

Mitsumoto, Keisuke*; Goto, Saori*; Nemoto, Yuichi*; Akatsu, Mitsuhiro*; Goto, Terutaka*; Dung, N. D.*; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Sugiyama, Kiyohiro*; et al.

Journal of Physics; Condensed Matter, 25(29), p.296002_1 - 296002_8, 2013/07

https://doi.org/10.1088/0953-8984/25/29/296002
 Times Cited Count：2 Percentile：9.37(Physics, Condensed Matter)

109 (Records 1-20 displayed on this page)