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Journal Articles

Mictomagnetism and suppressed thermal conduction of the prototype high-entropy alloy CrMnFeCoNi

Yang, J.*; Ren, W.*; Zhao, X.*; Kikuchi, Tatsuya*; Miao, P.*; Nakajima, Kenji; Li, B.*; Zhang, Z.*

Journal of Materials Science and Technology, 99, p.55 - 60, 2022/02

High-entropy alloys are characteristic of extensive atomic occupational disorder on high-symmetric lattices, differing from traditional alloys. Here, we investigate magnetic and thermal transport properties of the prototype face-centered-cubic high-entropy alloy CrMnFeCoNi by combining physical properties measurements and neutron scattering. Direct-current (dc) and alternating-current (ac) magnetizations measurements indicate a mictomagnetic behavior with coexisting antiferromagnetic and ferromagnetic interactions in the entire temperature region and three anomalies are found at about 80, 50, and 20 K, which are related to the paramagnetic to antiferromagnetic transition, the antiferromagnetic to ferromagnetic transition, and the spin freezing, respectively. The electrical and thermal conductivities are significantly reduced compared to Ni and the temperature dependence of lattice thermal conductivity exhibits a glass-like plateau. Inelastic neutron scattering measurements suggest weak anharmonicity so that the thermal transport is expected to be dominated by the defect scattering.

Journal Articles

Stacking fault driven phase transformation in CrCoNi medium entropy alloy

He, H.*; Naeem, M.*; Zhang, F.*; Zhao, Y.*; Harjo, S.; Kawasaki, Takuro; Wang, B.*; Wu, X.*; Lan, S.*; Wu, Z.*; et al.

Nano Letters, 21(3), p.1419 - 1426, 2021/02

 Times Cited Count:3 Percentile:0(Chemistry, Multidisciplinary)

Journal Articles

Magnetic-field and composition tuned antiferromagnetic instability in the quantum spin-liquid candidate NaYbO$$_2$$

Guo, J.*; Zhao, X.*; Kawamura, Seiko; Ling, L.*; Wang, J.*; He, L.*; Nakajima, Kenji; Li, B.*; Zhang, Z.*

Physical Review Materials (Internet), 4(6), p.064410_1 - 064410_7, 2020/06

 Times Cited Count:4 Percentile:51.8(Materials Science, Multidisciplinary)

Journal Articles

Ultralow thermal conductivity from transverse acoustic phonon suppression in distorted crystalline $$alpha$$-MgAgSb

Li, X.*; Liu, P.-F.*; Zhao, E.*; Zhang, Z.*; Guide, T.*; Le, M. D.*; Avdeev, M.*; Ikeda, Kazutaka*; Otomo, Toshiya*; Kofu, Maiko; et al.

Nature Communications (Internet), 11(1), p.942_1 - 942_9, 2020/02

 Times Cited Count:15 Percentile:93.25(Multidisciplinary Sciences)

In high-performance thermoelectric materials, there are two main low thermal conductivity mechanisms: the phonon anharmonic and phonon scattering resulting from the dynamic disorder, which have been successfully revealed by inelastic neutron scattering. Using neutron scattering and ab initio calculations, we report here a mechanism of static local structure distortion combined with phonon-anharmonic-induced ultralow lattice thermal conductivity in $$alpha$$-MgAgSb. Since the transverse acoustic phonons are almost fully scattered by the intrinsic distorted rocksalt sublattice in this compound, the heat is mainly transported by the longitudinal acoustic phonons. The ultralow thermal conductivity in $$alpha$$-MgAgSb is attributed to its atomic dynamics being altered by the structure distortion, which presents a possible microscopic route to enhance the performance of similar thermoelectric materials.

Journal Articles

Coexistence of ferromagnetic and stripe-type antiferromagnetic spin fluctuations in YFe$$_{2}$$Ge$$_{2}$$

Wo, H.*; Wang, Q.*; Shen, Y.*; Zhang, X.*; Hao, Y.*; Feng, Y.*; Shen, S.*; He, Z.*; Pan, B.*; Wang, W.*; et al.

Physical Review Letters, 122(21), p.217003_1 - 217003_5, 2019/05

 Times Cited Count:2 Percentile:35.62(Physics, Multidisciplinary)

Journal Articles

Faradaically selective membrane for liquid metal displacement batteries

Yin, H.*; Chung, B.*; Chen, F.*; Ouchi, Takanari*; Zhao, J.*; Tanaka, Nobuyuki; Sadoway, D. R.*

Nature Energy (Internet), 3(2), p.127 - 131, 2018/02

 Times Cited Count:21 Percentile:76.28(Energy & Fuels)

We disclose a new porous electronically conductive membrane, which achieves chemical selectivity by preferred faradaic reaction. This shift in membrane mechanism grants access to a variety of heretofore forbidden choices for positive and negative electrode metals and allows the battery to charge-discharge at high rate without degradation. Fitted with a porous membrane of TiN, a displacement cell comprising a Pb positive electrode, a Li Pb negative electrode, and LiCl-KCl eutectic electrolyte was cycled at 410$$^{circ}$$C and exhibited a coulombic efficiency of 92%. The capacity fade rate was measured to be 0.00172% per cycle, which is tantamount to retention of greater than 94% of initial capacity after 10 years. Most significant from the standpoint of scalability, we show that the faradaic membrane can be fashioned out of metal so as to be mechanically durable and therefore easily mass-produced at large scale with a thin cross-section for minimal ohmic drop in cell voltage.

Journal Articles

Uniaxial pressure effect on the magnetic ordered moment and transition temperatures in BaFe$$_{2-x}$$T$$_{x}$$As$$_{2}$$ ($$T$$ = Co,Ni)

Tam, D. M.*; Song, Y.*; Man, H.*; Cheung, S. C.*; Yin, Z.*; Lu, X.*; Wang, W.*; Frandsen, B. A.*; Liu, L.*; Gong, Z.*; et al.

Physical Review B, 95(6), p.060505_1 - 060505_6, 2017/02

 Times Cited Count:18 Percentile:75.96(Materials Science, Multidisciplinary)

Journal Articles

Spin excitations in optimally P-doped BaFe$$_2$$(As$$_{0.7}$$P$$_{0.3}$$)$$_2$$ superconductor

Hu, D.*; Yin, Z.*; Zhang, W.*; Ewings, R. A.*; Ikeuchi, Kazuhiko*; Nakamura, Mitsutaka; Roessli, B.*; Wei, Y.*; Zhao, L.*; Chen, G.*; et al.

Physical Review B, 94(9), p.094504_1 - 094504_7, 2016/09

AA2016-0252.pdf:2.18MB

 Times Cited Count:14 Percentile:64.66(Materials Science, Multidisciplinary)

The temperature and energy dependence of spin excitations in an optimally P-doped BaFe$$_2$$(As$$_{0.7}$$P$$_{0.3}$$)$$_2$$ superconductor (T$$_c$$ = 30 K) were studied by using inelastic neutron scattering. Experimental results are consistent with calculations from a combined density functional theory and dynamical mean field theory, and suggest that the decreased average pnictogen height in BaFe$$_2$$(As$$_{0.7}$$P$$_{0.3}$$)$$_2$$ reduces the strength of electron correlations and increases the effective bandwidth of magnetic excitation.

Journal Articles

Diluted ferromagnetic semiconductor Li(Zn,Mn)P with decoupled charge and spin doping

Deng, Z.*; Zhao, K.*; Gu, B.; Han, W.*; Zhu, J. L.*; Wang, X. C.*; Li, X.*; Liu, Q. Q.*; Yu, R. C.*; Goko, Tatsuo*; et al.

Physical Review B, 88(8), p.081203_1 - 081203_5, 2013/08

 Times Cited Count:66 Percentile:92.87(Materials Science, Multidisciplinary)

Journal Articles

Anisotropic two-dimensional electron gas at the LaAlO$$_{3}$$/SrTiO$$_{3}$$ (110) interface

Annadi, A.*; Zhang, Q.*; Renshaw Wang, X.*; Tuzla, N.*; Gopinadhan, K.*; L$"u$, W. M.*; Roy Barman, A.*; Liu, Z. Q.*; Srivastava, A.*; Saha, S.*; et al.

Nature Communications (Internet), 4, p.1838_1 - 1838_7, 2013/05

 Times Cited Count:84 Percentile:94.96(Multidisciplinary Sciences)

Journal Articles

Magnetic resonance studies of defects in electron-irradiated ZnO substrates

Son, N. T.*; Ivanov, I. G.*; Kuznetsov, A. Yu.*; Svensson, B. G.*; Zhao, Q. X.*; Willander, M.*; Morishita, Norio; Oshima, Takeshi; Ito, Hisayoshi; Isoya, Junichi*; et al.

Physica B; Condensed Matter, 401-402, p.507 - 510, 2007/12

 Times Cited Count:3 Percentile:18.97(Physics, Condensed Matter)

Defects in electron-irradiated (3, 6 MeV) ZnO substrates were investigated using optical detection of magnetic response (ODMR). The shallow donor and the Zn vacancy were detected. In addition, several ODMR centers with S=$$frac{1}{2}$$ were also observed. Among these, LU3 and LU4 shows a behavior as recombination centers. After annealing at 400$$^{circ}$$C, both LU3 and LU4 still remain in ZnO substrates.

Journal Articles

Recombination centers in as-grown and electron-irradiated ZnO substrates

Son, N. T.*; Ivanov, G.*; Kuznetsov, A.*; Svensson, B. G.*; Zhao, Q. X.*; Willander, M.*; Morishita, Norio; Oshima, Takeshi; Ito, Hisayoshi; Isoya, Junichi*; et al.

Journal of Applied Physics, 102(9), p.093504_1 - 093504_5, 2007/11

 Times Cited Count:16 Percentile:55.33(Physics, Applied)

Optical detection of magnetic resonance (ODMR) was performed to investigate defects in ZnO irradiated with 3 MeV electrons at room temperature. As a result, the Zn vacancy and some other centers were detected by ODMR. The Zn vacancy and two other centers whish are labeled as LU3 and LU4, were also commonly observed in different types of as-grown ZnO. Therefore, it can be concluded that the both LU3 and LU4 might be related to intrinsic defects, and they act as dominating recombination centers in irradiated and as-grown ZnO.

Journal Articles

Modeling long-term volcanic hazards through Bayesian inference; An example from the Tohoku volcanic arc, Japan

Martin, A. J.*; ; Conner, C. B.*; Weller, J. N.*; Zhao, D.*; Takahashi, Masaki*

Journal of Geophysical Research; Solid Earth, 109(B10), p.B10208_1 - B10208_20, 2004/10

 Times Cited Count:57 Percentile:73.09(Geochemistry & Geophysics)

We achieve this using Bayesian inference in order to combine one or more sets of information (geophysical data) to a priori assumptions of volcano spatio-temporal distributions yielding modified a posteriori probabilities.

Journal Articles

Melting and crystallization of Nd$$_{60}$$Al$$_{10}$$Fe$$_{20}$$Co$$_{10}$$ bulk metallic glass under high pressure

Zhao, D. Q.*; Pan, M. X.*; Wang, W. H.*; Wei, B. C.*; Okada, Taku; Utsumi, Wataru

Journal of Physics; Condensed Matter, 15(50), p.L749 - L753, 2003/12

 Times Cited Count:9 Percentile:34.04(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Theoretical study on dielectronic recombination of O$$^{6+}$$ ions in metastable states

Zhao, L.-B.*; Shirai, Toshizo

Physical Review A, 64(5), p.052704_1 - 052704_6, 2001/11

A computational scheme, based on the theory of continuum-bound transitions of Bell and Seaton [J. Phys. B $${bf 18}$$, 1589 (1985)] and the close-coupling R-matrix approach, has been developed to treat dielectronic recombination (DR) in high-lying resonance energy regions. This scheme and our presented numerical method to compute DR in low-lying resonance energy regions [Phys. Rev. A $${bf 62}$$, 022706 (2000)] have been applied together to elucidate the experimental spectra of DR of O$$^{6+}$$ ions in the metastable $$1s2s,,^3S$$ and $$1s2s,,^1S$$ states. For comparison, a perturbative theoretical calculation of DR for O$$^{6+}$$ has also been accompanied. The reasonable representation of the general dielectronic spectral shape is yielded by both our close-coupling and perturbative calculations. However, both the methods do not reproduce the experimental double peak structure at $$sim$$ 6-8 eV. This shows that the further investigation on DR of this kind of ions is required both experimentally and theoretically.

Journal Articles

Strong relativistic effects on dielectronic recombination of metaotable Li$$^{+}$$ ions

Zhao, L.-B.; Shirai, Toshizo

Physical Review A, 63(1), p.703_1 - 703_4, 2001/01

no abstracts in English

Journal Articles

Photorecombination of C$$^{4+}$$ ions in low-lying resonance energy regions

Zhao, L.-B.; Ichihara, Akira; Shirai, Toshizo

Physical Review A, 62(2), p.022706_1 - 022706_8, 2000/08

 Times Cited Count:11 Percentile:51.6(Optics)

no abstracts in English

Oral presentation

Chirped pulse amplification laser using Nd:glass zig-zag slab pumped by laser diodes

Sueda, Keiichi*; Kurita, Takashi*; Kawashima, Toshiyuki*; Yamakawa, Koichi; Kawanaka, Junji*; Sekine, Takashi*; Zhao, B.*; Jiang, Y.*; Matsumoto, Osamu*; Fujita, Masayuki*; et al.

no journal, , 

no abstracts in English

18 (Records 1-18 displayed on this page)
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