Large coercivity of 13 kOe in L10-ordered CoPt on Si/SiO2 substrates by hydrogen annealing
R. Toyama, S. Kawachi, J. Yamaura, Y. Murakami, H. Hosono, Y. Majima
to appear in Jpn. J. Appl. Phys. (2022).
2021
Origins of the coloration from structure and valence state of bismuth oxide glasses
A. Saito, K. Hayashi, K. Hanzawa, S. Ueda, S. Kawachi, J. Yamaura, K. Ide, J. Kim, G. Tricot, S. Matsuishi, K. Mitsui, T. Shimizu, M. Mori, H. Hosono, H. Hiramatsu
J. Non-Cryst. Solids 560, 120720 (2021).
Reversible 3D-2D structural phase transition and giant electronic modulation in nonequilibrium alloy semiconductor, lead-tin-selenide
T. Katase, Y. Takahashi, X. He, T. Tadano, K. Ide, H. Yoshida, S. Kawachi, J. Yamaura, M. Sasase, H. Hiramatsu, H. Hosono, T. Kamiya
Sci. Adv. 7, eabf2725 (2021).
Electronic and crystal structures of LnFeAsO1-xHx (Ln = La, Sm) studied by x-ray absorption spectroscopy, x-ray emission spectroscopy, and x-ray diffraction: I carrier-doping dependence
Y. Yamamoto, H. Yamaoka, T. Uozumi, A. Hariki, S. Onari, J. Yamaura, K. Ishii, T. Kawai, M. Yoshida, M. Taguchi, K. Kobayashi, J. -F. Lin, N. Hiraoka, H. Ishii, K.-D. Tsuei, H. Okanishi, S. Iimura, S. Matsuishi, H. Hosono, J. Mizuki
J. Phys: Condensed Matter 33, 255602 (2021).
Electronic and crystal structures of LnFeAsO1-xHx (Ln = La, Sm) studied by x-ray absorption spectroscopy, x-ray emission spectroscopy, and x-ray diffraction: II pressure dependence
Y. Yamamoto, H. Yamaoka, T. Kawai, M. Yoshida, J. Yamaura, K. Ishii, S. Onari, T. Uozumi, A. Hariki, M. Taguchi, K. Kobayashi, J. -F. Lin, N. Hiraoka, H. Ishii, K.-D. Tsuei, H. Okanishi, S. Iimura, S. Matsuishi, H. Hosono, J. Mizuki
J. Phys: Condensed Matter 33, 255603 (2021).
2020
Polar nano-region structure in oxynitride perovskite LaTiO2N
J. Yamaura, S. Maki, T. Honda, Y. Matsui, A. Noviyanto, T. Otomo, H. Abe, Y. Murakami, and N. Ohashi
Chem. Commun. 56, 1385 (2020).
Formation of L10-ordered CoPt during interdiffusion of electron-beam-deposited Pt/Co bilayer thin films on Si/SiO2 by rapid thermal annealing
R Toyama, S Kawachi, S Iimura, J Yamaura, Y Murakami, H Hosono, Y. Majima
Mater. Res. Express 7, 066101 (2020).
Ti underlayer effect on the ordering of CoPt in (Co/Pt)4 multilayer thin films on Si/SiO2 substrates
R. Toyama, S. Kawachi, J. Yamaura, Y. Murakami, H. Hosono, Y. Majima
Jpn. J. Appl. Phys. 59, 075504 (2020).
Enantiopure Crystal Growth of a Chiral Magnet YbNi3Al9 via the Flux Method with a Temperature Gradient
S. Nakamura, J. Inukai. T. Asaka, J. Yamaura, S. Ohara
J. Phys. Soc. Jpn. 89, 104005 (2020).
2019
Crystal structure and the magnetic properties of the 5d transition metal oxide AOsO4 (A = K, Rb, Cs)
J. Yamaura,Z. Hiroi
Phys. Rev. B. 99, 155133 (2019).
Quantum dynamics of hydrogen in iron-based superconductor LaFeAsO0.9D0.1 measured with inelastic neutron spectroscopy
J. Yamaura, H. Hiraka, S. Iimura, Y. Muraba, K. Ikeuchi, M. Nakamura, Y. Inamura, T. Honda, M. Hiraishi, K. M. Kojima, R. Kadono, Y. Murakami, S. Matsuishi, and H. Hosono
Phys. Rev. B. 99, 220505(R) (2019).
Orbital Transitions and Frustrated Magnetism in the Kagome-Type Copper Mineral Volborthite
Z. Hiroi, H. Ishikawa, H. Yoshida, J. Yamaura, and Y. Okamoto
Inorg. Chem. 58, 11949 (2019).
Crystal Structure Built from a GeO6-GeO5 Polyhedra Network with High Thermal Stability: beta-SrGe2O5
C. A. Niedermeier, J. Yamaura, J. Wu, X. He, T. Katase, H. Hosono, T. Kamiya
ACS Applied Electronic Materials. 1, 1989 (2019).
Direct coupling of ferromagnetic moment and ferroelectric polarization in BiFeO3
S. Kawachi, S. Miyahara, T. Ito, A. Miyake, N. Furukawa, J. Yamaura, and M. Tokunaga
Phys. Rev. B 100, 140412(R) (2019).
Ultrafast dynamics in the Lifshitz-type 5d pyrochlore antiferromagnet Cd2Os2O7
I. Kwak, M.-C. Lee, B. C. Park, C. H. Kim, B. Lee, C. W. Seo, J. Yamaura, Z. Hiroi, T. W. Noh, and K. W. Kim
Phys. Rev. B. 100, 144309 (2019).
Structural and thermal properties in formamidinium and Cs-mixed lead halides
S. Kawachi, M. Atsumi, N. Saito, N. Ohashi, Y. Murakami, J. Yamaura
J. Phys. Chem. Lett. 10, 6967 (2019).
Coupled Spin-Charge Fluctuation in the Semimetal Phase of All-In/All-Out Antiferromagnet Cd2Os2O7
A. Koda, H. T. Hirose, M. Miyazaki, H. Okabe, M. Hiraishi, I. Yamauchi, K. M. Kojima, K. Nagashima, J. Yamaura, Z. Hiroi, and R. Kadono
Phys. Rev. B 100, 245113 (2019).
2018
Pyrochlore oxide superconductor Cd2Re2O7 revisited
Z. Hiroi, J. Yamaura, T. C. Kobayashi, Y. Matsubayashi, and D. Hirai
J. Phys. Soc. Jpn., 87, 024702 (2018).
Structural Variations and Dielectric Properties of (Bi1-xLax)2SiO5 (0 < x < 0.1) Polycrystallines Synthesized by Crystallization of Bi-Si-O and Bi-La-Si-O Glasses
H. Taniguchi, S. Tatewaki, S. Yasui, Y. Fujii, J. Yamaura, and I. Terasaki
Phys. Rev. Mat. 2, 045603 (2018).
Field-Induced Antipolar-Polar Structural Transformation and Giant Electrostriction in Organic Crystal
K. Kobayashi, S. Horiuchi, S. Ishibashi, Y. Murakami, and R. Kumai
J. Am. Chem. Soc. 140, 3842 (2018).
High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7
Y. Matsubayashi, T. Hasegawa, N. Ogita, J. Yamaura, and Z. Hiroi
Physica B. 536, 600 (2018).
Crystal structure determination under high pressure in the iron-based ladder superconductor BaFe2S3
K. Kobayashi, S. Maki, Y. Murakami, Y. Hirata, K. Ohgushi, and J. Yamaura
Superconduct. Sci. Technol. 31, 105002 (2018).
Gapless magnetic excitation in a heavily electron-doped antiferromagnetic phase of LaFeAsO0.5D0.5
H. Tamatsukuri, H. Hiraka, K. Ikeuchi, S. Iimura, Y. Muraba, M. Nakamura, H. Sagayama, J. Yamaura, Y. Murakami, Y. Kuramoto, and H. Hosono
Phys. Rev. B.98, 174415 (2018).
Structural Insight into Charge Transfer Phase Transition for Unique Iron Mixed-Valence Complex (n-C3H7)4N[FeIIFeIII(dto)3] with 2D Honeycomb Network
M. Itoi, A. Okazawa, J. Yamaura, S. Maki, T. Komatsu, N. Kojima, I. Maurien, E. Codjovi, K. Boukheddaden. and F. Varret
Inorg. Chem. 57, 13728 (2018).
2017
Successive spatial symmetry breaking under high pressure in the spin-orbit-coupled metal Cd2Re2O7
J. Yamaura, K. Takeda, Y. Ikeda, N. Hirao, Y. Ohishi, T. C. Kobayashi, Z. Hiroi
Phys. Rev. B 95, 020102(R) (2017).
Robust ferromagnetism carried by antiferromagnetic domain walls
H. T. Hirose, J. Yamaura, Z. Hiroi
Scientific Reports, 7, 42440 (2017).
Magnetoresistance effect in a conducting molecular crystal consisting of dicyano(phthalocyaninato)manganese(III)
M. Matsuda, G. Yoshida, J. Yamaura, T. Inabe, H. Tajima
Dalton Transactions, 46, 1892 (2017).
Strong Spin-Phonon Coupling Mediated by Single Ion Anisotropy in the All-In--All-Out Pyrochlore Magnet Cd2Os2O7
C. H. Sohn, C. H. Kim, L. J. Sandilands, N. M. Hien, S. Y. Kim, H. J. Park, K. W. Kim, S. J. Moon, J. Yamaura, Z. Hiroi, and T. W. Noh
Phys. Rev. Lett. 118, 117201 (2017).
Semimetallic "Electride Bands" Derived from Interlayer Electrons in Quasi-Two-Dimensional Electride Y2C
K. Horiba, R. Yukawa, T. Mitsuhashi, M. Kitamura, T. Inoshita, N. Hamada, S. Otani, N. Ohashi, S. Maki, J. Yamaura, H. Hosono, Y. Murakami, H. Kumigashira
Phys. Rev. B 96, 045101 (2017).
Two-Magnon Scattering in 5d All-In?All-Out Pyrochlore Magnet Cd2Os2O7
N. T. M. Hien, L. J. Sandilands, C. H. Sohn, C. H. Kim, A. L. Wysocki, I.-S. Yang, S. J. Moon, J.-H. Ko, J. Yamaura, Z. Hiroi, and T. W. Noh
Nature Commun. 8, 251 (2017).
Structure determination in thin film Ba1-xLaxFe2As2: Relation between the FeAs4 geometry and superconductivity
K. Kobayashi, A. Nakao, S. Maki, J. Yamaura, T. Katase, H. Sato, H. Sagayama, R. Kumai, Y. Murakami, H. Hiramatsu, and H. Hosono
Phys. Rev. B 96, 125116 (2017).
Antiferroquadrupolar Ordering in Quadrupolar Kondo Lattice of Non-Kramers System PrTa2Al20
Ryuji Higashinaka, Akihiro Nakama, Ryoichi Miyazaki, Jun-ichi Yamaura, Hideyuki Sato, and Yuji Aoki
J. Phys. Soc. Jpn. 86, 103703 (2017).
Local magnetic susceptibility, spin dynamics, and charge order in the quasi-one-dimensional conductor beta-Li0.33V2O5 investigated by site-selective 51-V NMR
I. Yamauchi, M. Itoh, T. Yamauchi, J. Yamaura, and Y. Ueda
Phys. Rev. B. 96, 205114 (2017).
Spin dynamics in the high-field phases of volborthite
M. Yoshida, K. Nawa, H. Ishikawa, M. Takigawa, M. Jeong, S. Kramer, M. Horvati, C. Berthier, K. Matsui, T. Goto, S. Kimura, T. Sasaki, J. Yamaura, H. Yoshida, Y. Okamoto, and Z. Hiroi
Phys. Rev. B 96, 180413(R) (2017). [Editor's suggestion]
2016
Strong charge density wave fluctuation and sliding state in PdTeI with quasi-one-dimensional PdTe chains
H. Lei, K. Liu, J. Yamaura, S. Maki, Y. Murakami, Z.-Y. Lu, H. Hosono
Phys. Rev. B 93 (2016) 121101(R) (5pages).
Pressure effect on iron-based superconductor LaFeAsO1-xHx: Peculiar response of 1111-type structure
K. Kobayashi, J. Yamaura, S. Iimura, S. Maki, H. Sagayama, R. Kumai, Y. Murakami, H. Takahashi, S. Matsuishi, H. Hosono
Scientific Reports 6, 39646 (2016).プレスリリース(KEK)
2015
Optical Spectroscopic Studies of the Metal-Insulator Transition Driven by All-In/All-Out Magnetic Ordering in 5d Pyrochlore Cd2Os2O7
C. H. Sohn, H. Jeong, H. Jin, S. Y. Kim, L. J. Sandilands, H. J. Park, K. W. Kim, J. Moon, D.-Y. Cho, J. Yamaura, Z. Hiroi, W. Noh
Phys. Rev. Lett. 115, 266402 (2015).
Effects of aluminum substitution on the structure and electric properties of langasite family crystals
H. Takeda, J. Yamaura, T. Nishida,T. Hoshina, T. Tsurumi
Crystal Research & Technology 50, 944 (2015).
Effects of stoichiometry and substitution in quasi-one-dimensional iron chalcogenide BaFe2S3
Y. Hirata, S. Maki, J. Yamaura, T. Yamauchi, K. Ohgushi
Phys. Rev. B 92, 205109 (2015).
On the microscopic dynamics of the 'Einstein solids' AlV2Al20 and GaV2Al20, and of YV2Al20: A benchmark system for 'rattling' excitations
M. M. Koza, H. Mutka, Y. Okamoto, J. Yamaura, Z. Hiroi
Phys. Chem. Chem. Phys. 17, 24837 (2015).
Large Diamagnetic Susceptibility from Petit Fermi Surfaces in LaV2Al20
T. Hirose, Y. Okamoto, J. Yamaura, Z. Hiroi
J. Phys. Soc. Jpn. 84, 113701 (2015).
Lifshitz metal-insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd2Os2O7
Z. Hiroi, J. Yamaura, T. Hirose, I. Nagashima, Y. Okamoto
APL Materials 3, 041501 (2015).
Low dimensionalization of magnetic ordering in Sr2VO4 by hydride ion substitution
J. Bang, S. Matsuishi, S. Maki, J. Yamaura, M. Hiraishi, S. Takeshita, I. Yamauchi, K. M. Kojima, and H. Hosono
Phys. Rev. B 92, 064414 (2015).
One-Third Magnetization Plateau with a Preceding Novel Phase in Volborthite
H. Ishikawa, M. Yoshida, K. Nawa, M. Jeong, S. Kramer, M. Horvati, C. Berthier, M. Takigawa, M. Akaki, A. Miyake, M. Tokunaga, K. Kindo, J. Yamaura, Y. Okamoto, and Z. Hiroi
Phys. Rev. Lett. 114, 227202 (2015).
Spinodally decomposed nanostructures in a TiO2/VO2 crystal
Z. Hiroi, T. Yoshida, J. Yamaura, and Y. Okamoto
APL Materials. 3, 062508 (2015).
All-In/All-Out Magnetic Domains: X-Ray Diffraction Imaging and Magnetic Field Control
S. Tardif, S. Takeshita, H. Ohsumi, J. Yamaura, D. Okuyama, Z. Hiroi, M. Takata, and T. Arima
Phys. Rev. Lett. 114, 147205 (2015).
A Si-poor member of tourmaline supergroup from the Kiura mine, Oita Prefecture, Japan
D. Nishio-Hamane, T. Minakawa, J. Yamaura, T. Oyama, M. Ohnishi, N. Shimobayashi
J. of Miner. Petrol. Sci., 109, 74-78 (2014).
Electronic State of CeFe4As12 Investigated by Using Single Crystals Grown under High Pressure of 4 GPa
Y. Ogawa, H. Sato, M. Watanabe, T. Namiki, S. Tatsuoka, R. Higashinaka, Y. Aoki, K. Kuwahara, J. Yamaura, Z. Hiroi
J. Phys. Soc. Jpn, 83, 034710 (2014).
Bipartite magnetic parent phases in the iron oxypnictide superconductor
M. Hiraishi, S. Iimura, K. M. Kojima, J. Yamaura, H. Hiraka, K. Ikeda, P. Miao, Y. Ishikawa, S. Torii, M. Miyazaki, I. Yamauchi, A. Koda, K. Ishii, M. Yoshida, J. Mizuki, R. Kadono, R. Kumai, T. Kamiyama, T. Otomo, Y. Murakami, S. Matsuishi and H. Hosono
Nat. Phys. 10 (2014) 300.プレスリリース(KEK)
Hydrogen ordering and new polymorph of layered perovskite oxyhydrides: Sr2VO4-xHx"
J. Bang, S. Matsuishi, H. Hiraka, F. Fujisaki, T. Otomo, S. Maki, J. Yamaura, R. Kumai, Y. Murakami, H. Hosono
J. Am. Chem. Soc. 136, 7221-7224 (2014).
Layered compounds BaM2Ge4Ch6 (M = Rh, Ir and Ch = S, Se) with pyrite-type building blocks and Ge-Ch hetero-molecule-like anions
H. Lei, J. Yamaura, J. Guo, Y. Qi, Y. Toda, H. Hosono
Inorg. Chem. 53 (2014) 5684-5691.
Novel rattling of K atoms in aluminium-doped defect pyrochlore tungstate
E. Shoko, G. J. Kearley, V. K. Peterson, H. Mutka, M. M. Koza, J. Yamaura, Z. Hiroi, G. J. Thorogood
J. Phys. Cond. Matter, 26 (2014) 305401.
Study of Chiral Structure and Magnetism in Heavy-Fermion Yb(Ni1-xCux)3Al9
S. Ohara, S. Fukuta, K. Ohta, H. Kono, T. Yamashita, Y. Matsumoto, and J. Yamaura
JPS Conf. Proc. 3, 017016 (2014).
2013
Complex orbital state stabilized by strong spin-orbit coupling in a metallic iridium oxide IrO2
Y. Hirata, K. Ohgushi, J. Yamaura, H. Ohsumi, S. Takeshita, M. Takata
and T. Arima
Phys. Rev. B. 87, 161111 (2013).
Resonant X-ray Diffraction Study of the Strongly Spin-Orbit-Coupled Mott Insulator CaIrO3
K. Ohgushi, J. Yamaura, H. Ohsumi, K. Sugimoto, S. Takeshita, A. Tokuda,H. Takagi, M. Takata, and T. Arima
Phys. Rev. Lett. 110, 217212 (2013). プレスリリース(SPring-8)
Pressure Effects on Rattling and Superconductivity in the Einstein Solids
Y. Ikeda, Y. Kawasaki, T. Shinohara, S. Araki, T. C. Kobayashi, A. Onosaka, Y. Okamoto, J. Yamaura, and Z. Hiroi
J. Phys. Soc. Jpn. 82, 063707 (2013).
Spinodal Decomposition in the TiO2-VO2 System
Z. Hiroi, H. Hayamizu, T. Yoshida, Y. Muraoka, Y. Okamoto, J. Yamaura, and Y. Ueda
Chem. Mater., 25, 2202 (2013).
YCr6Ge6 as a Candidate Compound for a Kagome Metal
Y. Ishii, H. Harima, Y. Okamoto, J. Yamaura and Z. Hiroi, J. Yamaura
J. Phys. Soc. Jpn. 82, 023705 (2013).
Understanding of the Temperature-Pressure Phase Diagram of beta-Pyrochlore Oxides: a Role of Anhamonicity on Superconductivity
T. Isono, D. Iguchi, T. Matsubara, Y. Machida, B. Salce, J. Flouquet, H. Ogusu, J. Yamaura, Z. Hiroi, and K. Izawa
J. Phys. Soc. Jpn. 82, 114708 (2013). JPSJ editor's choice
Superconductivity in Ban+2Ir4nGe12n+4 (n=1,2) with cage structure and softening of low-lying localized mode
J. Guo, J. Yamaura, H. Lei, S. Matsuishi, Y. Qi, and H. Hosono
Phys. Rev. B. 88, 140507 (2013). PRB editor's suggestion
Rattling Good Superconductor: β-Pyrochlore Oxides AOs2O6
Z. Hiroi, J. Yamaura, K. Hattori
J. Phys. Soc. Jpn. 81 (2012) 011012 (24 pages). JPSJ SPECIAL TOPICS: Recent Developments in Superconductivity
Superconductivity in an Einstein Solid AxV2Al20 (A=Al and Ga)
A. Onosaka, Y. Okamoto, J. Yamaura, Z. Hiroi
J. Phys. Soc. Jpn. 81 (2012) 023703.
Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: A first Cr-dominant amphibole from Akaishi mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan
D. Nishio-Hamane, M. Ohnishi, T. Minakawa, J. Yamaura, S. Saito, R. Kadota
J. Mineral. Petro. Sciences. 107 (2012) 1.
Orbital Switching in a Frustrated Magnet
H. Yoshida, J. Yamaura, M. Isobe, Y. Okamoto, G. J. Nilsen, Z. Hiroi
Nature Commun. 3 (2012) 860. プレスリリース(NIMS)
Large homogeneous mass enhancement in the rattling-induced superconductor KOs2O6
T. Terashima, N. Kurita, A. Kiswandhi, E.-S. Choi, J. S. Brooks, K. Sato, J. Yamaura, Z. Hiroi, H. Harima, S. Uji
Phys. Rev. B. 85 (2012) 180503.
Crystal Chemistry and Magnetic Properties of Manganese Zinc Alloy "YMn2Zn20" Comprising a Mn Pyrochlore Lattice
Y. Okamoto, T. Shimizu, J. Yamaura, Z. Hiroi
J. Solid State Chem. 191 (2012) 246.
A novel crystal polymorph of volborthite, Cu3V2O7(OH)2.2H2O
H. Ishikawa, J. Yamaura, Y. Okamoto, H. Yoshida, G. J. Nilsen, Z. Hiroi
Acta. Crystallogr. C. 68 (2012) i41.
Tetrahedral Magnetic Order and the Metal-Insulator Transition in the Pyrochlore Lattice of Cd2Os2O7 J. Yamaura, K. Ohgushi, H. Ohsumi, T. Hasegawa, I. Yamauchi, K. Sugimoto, S. Takeshita, A. Tokuda, M. Takata, M. Udagawa, M. Takigawa, H. Harima, T. Arima, Z. Hiroi
Phys. Rev. Lett. 108 (2012) 247205. プレスリリース(東京大学, SPring-8)
Rattling and Superconducting Properties of a Cage Compound GaxV2Al20
Z. Hiroi, A. Onosaka, Y. Okamoto, J. Yamaura, H. Harima
J. Phys. Soc. Jpn. 81 (2012) 124707.
Large Diamagnetism of AV2Al20 (A=Y and La)
A. Onosaka, Y. Okamoto, J. Yamaura, T. Hirose, Z. Hiroi
J. Phys. Soc. Jpn. 81 (2012) 123702.
Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutterudites
ROs4Sb12 (R = light rare-earth)
Satoshi Tsutsui, 1 Hiroshi Uchiyama, 1 John P. Sutter, 1,2 Alfred Q. R. Baron, 1,3 Masaichiro Mizumaki, 1
Naomi Kawamura, 1 Tomoya Uruga, 1 Hitoshi Sugawara, 4 Jun-ichi Yamaura, 5 Akira Ochiai, 6
Takumi Hasegawa, 7 Norio Ogita, 7 Masayuki Udagawa, 7 and Hideyuki Sato 8
Phys. Rev. B 86 (2012) 195115.