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Journal Articles

Elastic and inelastic neutron scattering experiments under high pressure in the frustrated antiferromagnet CuFeO$$_{2}$$

Terada, Noriki*; Khalyavin, D. D.*; Manuel, P.*; Asai, Shinichiro*; Masuda, Takatsugu*; Saito, Hiraku*; Nakajima, Taro*; Osakabe, Toyotaka

Physical Review B, 110(2), p.024406_1 - 024406_9, 2024/07

The frustrated antiferromagnet CuFeO$$_{2}$$ exhibits pressure-induced complex magnetic phase transitions from the commensurate collinear (CM1) phase to several incommensurate noncollinear phases. To study the effect of high pressure on magnetic interactions, we performed neutron diffraction and inelastic neutron scattering experiments under high-pressure conditions. With increasing pressure, the CM1 ground state becomes less stable against application of a magnetic field even below the critical pressure ($${P}$$ $$leqq$$ 3 GPa), as proved by the significant reduction in the critical magnetic field from $${H_{c1}}$$ =7.5 T to 4.5 T at 2.1 GPa. Additionally, the energy gap in the spin-wave dispersion relation is reduced from 1.0 to 0.88 meV by the application of a pressure of $${P}$$ = 2.1 GPa. Comparing the experimental results with spin-wave calculations revealed that the change in the spin-wave excitation can be explained by the reduction in either the uniaxial anisotropy term or the degree of separation in the nearest-neighbor exchange interactions.

Journal Articles

Lattice dynamics of CH(NH$$_{2}$$)$$_{2}$$PbI$$_{3}$$ and CH(NH$$_{2}$$)$$_{2}$$SnI$$_{3}$$ investigated by inelastic X-ray scattering and comparison of their elastic properties

Tamatsukuri, Hiromu; Murakami, Yoichi*; Saito, Noriko*; Ohashi, Naoki*; Tsutsui, Satoshi*

Physical Review B, 110(2), p.024301_1 - 024301_8, 2024/07

Journal Articles

Spin and lattice dynamics in the van der Waals antiferromagnet MnPSe$$_{3}$$

Liao, J.*; Huang, Z.*; Shangguan, Y.*; Zhang, B.*; Cheng, S.*; Xu, H.*; Kajimoto, Ryoichi; Kamazawa, Kazuya*; Bao, S.*; Wen, J.*

Physical Review B, 109(22), p.224411_1 - 224411_10, 2024/06

Journal Articles

Single helicity of the triple-$$q$$ triangular skyrmion lattice state in the cubic chiral helimagnet EuPtSi

Matsumura, Takeshi*; Tabata, Chihiro; Kaneko, Koji; Nakao, Hironori*; Kakihana, Masashi*; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*

Physical Review B, 109(17), p.174437_1 - 174437_8, 2024/05

Journal Articles

Nonlinear enhancement of coherent magnetization dynamics

Elyasi, M.*; Yamamoto, Kei; Hioki, Tomosato*; Makiuchi, Takahiko*; Shimizu, Hiroki*; Saito, Eiji*; Bauer, G. E. W.*

Physical Review B, 109(18), p.L180402_1 - L180402_7, 2024/05

Journal Articles

Magnetic order in honeycomb layered U$$_2$$Pt$$_6$$Ga$$_{15}$$ studied by resonant X-ray and neutron scattering

Tabata, Chihiro; Kon, Fusako*; Ota, Kyugo*; Hibino, Ruo*; Matsumoto, Yuji*; Amitsuka, Hiroshi*; Nakao, Hironori*; Haga, Yoshinori; Kaneko, Koji

Physical Review B, 109(13), p.134403_1 - 134403_7, 2024/04

Journal Articles

Inelastic neutron scattering of hydrogen in palladium studied by semiclassical dynamics

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

Physical Review B, 109(5), p.054303_1 - 054303_12, 2024/02

Inelastic neutron scattering spectra of hydrogen in palladium were calculated considering nuclear quantum effects at finite temperatures. A computational method combining semiclassical molecular dynamics based on path integrals and machine learning potentials was used. The calculated spectra agree well with the experimental spectra with respect to the positions and intensities of the peaks corresponding to the fundamental and first harmonic of the vibrational excitation of hydrogen atoms. Comparison with classical molecular dynamics shows that nuclear quantum effects play an essential role in the inelastic neutron scattering spectra.

Journal Articles

Composition dependence of bulk properties in the Co-intercalated transition metal dichalcogenide Co$$_{1/3}$$TaS$$_{2}$$

Park, P.*; Cho, W.*; Kim, C.*; An, Y.*; Avdeev, M.*; Iida, Kazuki*; Kajimoto, Ryoichi; Park, J.-G.*

Physical Review B, 109(6), p.L060403_1 - L060403_7, 2024/02

Journal Articles

Calculation of space-charge tune shift in a cylindrical chamber for bunched beams employing Green's function formalism

Shobuda, Yoshihiro

Physical Review Accelerators and Beams (Internet), 27(1), p.011001_1 - 011001_25, 2024/01

 Times Cited Count:0 Percentile:0.11(Physics, Nuclear)

When computing the space charge tune shift for a relativistic bunched beam within a cylindrical chamber, mirror currents for a coasting beam, initially introduced to replace the chamber wall, are employed. Subsequently, the obtained result is extended to encompass the bunched beam, taking into account the bunching factor which quantifies the distribution of bunches around the accelerator ring. In the process of derivation, the terms that characterize the bunch length are intuitively integrated into the formula. As a result, the validity of this approach has never been established. This study provides the derivation of the space charge tune shift formula for both relativistic and non-relativistic bunched beams right from the outset, employing the Green function formalism. Subsequently, it is compared with the earlier formula derived using mirror currents.

Journal Articles

Microscopic origin of the spin-reorientation transition in the kagome topological magnet TbMn$$_{6}$$Sn$$_{6}$$

Huang, Z.*; Wang, W.*; Ye, H.*; Bao, S.*; Shangguan, Y.*; Liao, J.*; Cao, S.*; Kajimoto, Ryoichi; Ikeuchi, Kazuhiko*; Deng, G.*; et al.

Physical Review B, 109(1), p.014434_1 - 014434_9, 2024/01

 Times Cited Count:0 Percentile:0.01(Materials Science, Multidisciplinary)

Journal Articles

Dirac Kondo effect under magnetic catalysis

Hattori, Koichi*; Suenaga, Daiki*; Suzuki, Kei; Yasui, Shigehiro*

Physical Review B, 108(24), p.245110_1 - 245110_11, 2023/12

 Times Cited Count:0 Percentile:0.00(Materials Science, Multidisciplinary)

We develop a mean-field theory of a novel Kondo effect emerging in systems without a Fermi surface, which instead emerges under strong magnetic fields. We determine the magnitude of the Kondo condensate, which is a particle pairing composed of conducting Dirac fermions and localized impurities. We focus on the competition between the Kondo effect and the energy gap formation that stems from the pairing among the Dirac fermions leading to the dynamical chiral symmetry breaking. We find that this competition induces a quantum critical point. We also investigate finite-temperature effects. This system at vanishing fermion density can be studied with Monte Carlo lattice simulations, which do not suffer from the sign problem.

Journal Articles

Understanding muon diffusion in perovskite oxides below room temperature based on harmonic transition state theory

Ito, Takashi; Higemoto, Wataru; Shimomura, Koichiro*

Physical Review B, 108(22), p.224301_1 - 224301_11, 2023/12

 Times Cited Count:1 Percentile:44.21(Materials Science, Multidisciplinary)

Journal Articles

Role of on-site Coulomb interactions in the half-metallic Weyl ferromagnet candidate thin-film Co$$_2$$FeSi

Sumida, Kazuki; Fujita, Yuichi*; Zhou, W.*; Masuda, Keisuke*; Kawasaki, Ikuto; Fujimori, Shinichi; Kimura, Akio*; Sakuraba, Yuya*

Physical Review B, 108(24), p.L241101_1 - L241101_6, 2023/12

Journal Articles

Impact of the ground-state 4${it f}$ symmetry for anisotropic ${it cf}$ hybridization in the heavy-fermion superconductor CeNi$$_{2}$$Ge$$_{2}$$

Fujiwara, Hidenori*; Nakatani, Yasuhiro*; Aratani, Hidekazu*; Kanai, Yuina*; Yamagami, Kohei*; Hamamoto, Satoru*; Kiss, Takayuki*; Yamasaki, Atsushi*; Higashiya, Atsushi*; Imada, Shin*; et al.

Physical Review B, 108(16), p.165121_1 - 165121_10, 2023/10

 Times Cited Count:0 Percentile:0.00(Materials Science, Multidisciplinary)

Journal Articles

Reversible structure change in graphene/metal interface by intercalation and deintercalation

Fukaya, Yuki; Entani, Shiro*; Sakai, Seiji*

Physical Review B, 108(15), p.155422_1 - 155422_6, 2023/10

 Times Cited Count:0 Percentile:0.00(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Anomalous vortex dynamics in the spin-triplet superconductor UTe$$_2$$

Tokiwa, Yoshifumi; Sakai, Hironori; Kambe, Shinsaku; Opletal, P.; Yamamoto, Etsuji; Kimata, Motoi*; Awaji, Satoshi*; Sasaki, Takahiko*; Yanase, Yoichi*; Haga, Yoshinori; et al.

Physical Review B, 108(14), p.144502_1 - 144502_5, 2023/10

 Times Cited Count:0 Percentile:0.00(Materials Science, Multidisciplinary)

The vortex dynamics in the spin-triplet superconductor, UTe$$_2$$, are studied by measuring the DC electrical resistivity with currents along the $$a$$-axis under magnetic fields along the $$b$$-axis. Surprisingly, we have discovered an island region of low critical current deep inside the superconducting (SC) state, well below the SC upper critical field, attributed to a weakening of vortex pinning. Notably, this region coincides with the recently proposed intermediate-field SC state. We discuss the possibility of nonsingular vortices in the intermediate state, where SC order parameter does not vanish entirely in the vortex cores due to the mixing of multiple SC components.

Journal Articles

Strongly renormalized quasiparticles in UPt$$_3$$

Kawasaki, Ikuto; Takeuchi, Kazuharu*; Fujimori, Shinichi; Takeda, Yukiharu; Yamagami, Hiroshi; Yamamoto, Etsuji; Haga, Yoshinori

Physical Review B, 108(16), p.165127_1 - 165127_9, 2023/10

Journal Articles

Fingerprint of vortexlike flux closure in an isotropic Nd-Fe-B bulk magnet

Bersweiler, M.*; Oba, Yojiro; Sinaga, E. P.*; Peral, I.*; Titov, I.*; Adams, M. P.*; Rai, V.*; Metlov, K. L.*; Michels, A.*

Physical Review B, 108(9), p.094434_1 - 094434_7, 2023/09

 Times Cited Count:1 Percentile:44.21(Materials Science, Multidisciplinary)

Journal Articles

Element-specific insight into ferromagnetic stability in UCoGe revealed by soft X-ray magnetic circular dichroism

Takeda, Yukiharu; Posp$'i$$v{s}$il, J.*; Yamagami, Hiroshi; Yamamoto, Etsuji; Haga, Yoshinori

Physical Review B, 108(8), p.085129_1 - 085129_10, 2023/08

 Times Cited Count:0 Percentile:0.00(Materials Science, Multidisciplinary)

Journal Articles

Observation of field-induced single-ion magnetic anisotropy in a multiorbital Kondo alloy (Lu,Yb)Rh$$_2$$Zn$$_{20}$$

Kitazawa, Takafumi; Ikeda, Yoichi*; Sakakibara, Toshiro*; Matsuo, Akira*; Shimizu, Yusei*; Tokunaga, Yo; Haga, Yoshinori; Kindo, Koichi*; Nambu, Yusuke*; Ikeuchi, Kazuhiko*; et al.

Physical Review B, 108(8), p.085105_1 - 085105_7, 2023/08

788 (Records 1-20 displayed on this page)