K. Iwasa

activity

20052021

most citedEmergence of magnetic long-range order in frustrated pyrochlore Nd

_{2}

_{2}

_{7}

with metal-insulator transition

161 citations · 641 across the 16 of their papers we have counts for

collaborators

Showing cond-mat.str-elShow all

13 papers · 1 filter

cond-mat.str-el2018★ 1 cited

Magnetic excitation emergence relevant to carrier scattering in semimetal Yb $_{3}$ Ir $_{4}$ Ge $_{13}$

Kazuaki Iwasa, C. -L. Huang, Binod K. Rai +3

Inelastic neutron scattering experiments have been conducted to investigate the semimetal system Yb $_{3}$ Ir $_{4}$ Ge $_{13}$ . No clear crystal-field-split levels were observed up to an e…

cond-mat.str-el2017★ 5 cited

Quantum paramagnet near spin-state transition

K. Tomiyasu, N. Ito, R. Okazaki +11

Spin-state transition, also known as spin crossover, plays a key role in diverse systems, including minerals and biological materials. In theory, the boundary range between the low…

cond-mat.str-el2015★ 10 cited

Microscopic examinations of Co valences and spin states in electron-doped LaCoO $_{3}$

Keisuke Tomiyasu, Syun-Ichi Koyama, Masanori Watahiki +12

We studied the Co valences and spin states in electron-doped LaCo $_{1 - y}$ Te $_{y}$ O $_{3}$ by measuring x-ray absorption spectra and electron spin resonance. The low-temperature insula…

cond-mat.str-el2014★ 23 cited

Spin-orbit fluctuations in frustrated heavy-fermion metal LiV $_{2}$ O $_{4}$

K. Tomiyasu, K. Iwasa, H. Ueda +6

Spin fluctuations were studied over a wide momentum ( $ℏ Q$ ) and energy ( $E$ ) space in the frustrated $d$ -electron heavy-fermion metal LiV $_{2}$ O $_{4}$ by time-of-flight inelastic n…

cond-mat.str-el2011★ 15 cited

Effect of cation size variance on spin and orbital order in Eu $_{1 - x}$ (La $_{0.254}$ Y $_{0.746}$ ) $_{x}$ VO $_{3}$

R. Fukuta, S. Miyasaka, K. Hemmi +8

We have investigated the $R$ -ion ( $R$ = rare earth or Y) size variance effect on spin/orbital order in Eu $_{1 - x}$ (La $_{0.254}$ Y $_{0.746}$ ) $_{x}$ VO $_{3}$ . The size variance disturbs o…

cond-mat.str-el2011★ 161 cited

Emergence of magnetic long-range order in frustrated pyrochlore Nd $_{2}$ Ir $_{2}$ O $_{7}$ with metal-insulator transition

K. Tomiyasu, K. Matsuhira, K. Iwasa +7

In this study, we performed powder neutron diffraction and inelastic scattering measurements of frustrated pyrochlore Nd $_{2}$ Ir $_{2}$ O $_{7}$ , which exhibits a metal-insulator transition…

cond-mat.str-el2011★ 18 cited

Molecular spin-liquid state in spin-3/2 frustrated spinel HgCr $_{2}$ O $_{4}$

K. Tomiyasu, H. Ueda, M. Matsuda +3

A hexamer-type spin excitation seen in spinel chromates $A$ Cr $_{2}$ O $_{4}$ ( $A$ = Mg, Zn, or Cd) is the representative spin-liquid-like state caused by geometrical frustration. To clar…

cond-mat.str-el2011★ 43 cited

Molecular spin-orbit excitations in the J_eff = 1/2 frustrated spinel GeCo $_{2}$ O $_{4}$

K. Tomiyasu, M. K. Crawford, D. T. Adroja +9

We describe powder and single-crystal inelastic neutron scattering experiments on a spinel-type antiferromagnet GeCo $_{2}$ O $_{4}$ , represented by an effective total angular momentum J_…

cond-mat.str-el2011★ 5 cited

Spin-orbit coupling inactivity of Co $^{2 +}$ ion in geometrically frustrated magnet GeCo $_{2}$ O $_{4}$

Keisuke Tomiyasu, Ayaka Tominaga, Shigeo Hara +5

We report single-crystal neutron diffraction studies on a spinel antiferromagnet GeCo $_{2}$ O $_{4}$ , which exhibits magnetic order with a trigonal propagation vector and tetragonal latt…

cond-mat.str-el2007★ 70 cited

Detection of Neutron Scattering from Phase IV of Ce0.7La0.3B6: A Confirmation of the Octupole Order

K. Kuwahara, K. Iwasa, M. Kohgi +3

We have performed a single crystal neutron scattering experiment on Ce0.7La0.3B6 to investigate the order parameter of phase IV microscopically. Below the phase transition temperat…

cond-mat.str-el2005★ 43 cited

Role of p-f Hybridization in the Metal-Non-Metal Transition of PrRu4P12

Kazuaki Iwasa, Lijie Hao, Tomoo Hasegawa +10

Electronic state evolution in the metal-non-metal transition of PrRu4P12 has been studied by X-ray and polarized neutron diffraction experiments. It has been revealed that, in the…

cond-mat.str-el2005★ 92 cited

Evolution of 4f-Electron States in the Metal-Insulator Transition of PrRu $_{4}$ P $_{12}$

Kazuaki Iwasa, Lijie Hao, Keitaro Kuwahara +7

Magnetic excitations of the filled skutterudite PrRu4P12 exhibiting a metal-insulator (M-I) transition at TM-I= 63 K were studied by inelastic neutron scattering experiment. The sp…

cond-mat.str-el2005★ 111 cited

Direct Observation of Quadrupolar Excitons in the Heavy-Fermion Superconductor PrOs $_{4}$ Sb $_{12}$

K. Kuwahara, K. Iwasa, M. Kohgi +8

We report inelastic neutron scattering experiments performed to investigate the low energy magnetic excitations on single crystals of the heavy-fermion superconductor PrOs $_{4}$ Sb$…

Magnetic excitation emergence relevant to carrier scattering in semimetal Yb3​Ir4​Ge13​

Quantum paramagnet near spin-state transition

Microscopic examinations of Co valences and spin states in electron-doped LaCoO3​

Spin-orbit fluctuations in frustrated heavy-fermion metal LiV2​O4​

Effect of cation size variance on spin and orbital order in Eu1−x​(La0.254​Y0.746​)x​VO3​

Emergence of magnetic long-range order in frustrated pyrochlore Nd2​Ir2​O7​ with metal-insulator transition

Molecular spin-liquid state in spin-3/2 frustrated spinel HgCr2​O4​

Molecular spin-orbit excitations in the J_eff = 1/2 frustrated spinel GeCo2​O4​

Spin-orbit coupling inactivity of Co2+ ion in geometrically frustrated magnet GeCo2​O4​