Results 61 to 70 of about 19,972 (281)

Phase stability and structural temperature dependence in sodium niobate: A high resolution powder neutron diffraction study

, 2010
We report investigation of structural phase transitions in technologically important material sodium niobate as a function of temperature on heating over 300-1075 K.
D. Vanderbilt, L. E. Cross, L. G. Tejuca, M. E. Lines, R. Mittal, S. K. Mishra, S. L. Chaplot, V. Yu. Pomjakushin, Xu. Yuhuan   +8 more
core   +1 more source

Magnetic Resonant X-Ray Scattering in KCuF3 [PDF]

, 2002
We study the magnetic resonant x-ray scattering (RXS) spectra around the $K$ edge of Cu in KCuF$_3$ on the basis of an {\em ab initio} calculation. We use the full-potential linearlized augmented plane wave method in the LDA$+U$ scheme, and introduce the
Igarashi, J., Takahashi, M., Usuda, M.
core   +1 more source

Atomically Revealing Bulk Point Defect Dynamics in Hydrogen‐Driven γ‐Fe2O3 → Fe3O4 → FeO Transformation

Advanced Functional Materials, EarlyView.
In situ TEM uncovers the atomic‐scale mechanisms underlying hydrogen‐driven γ‐Fe2O3→Fe3O4→FeO reduction. In γ‐Fe2O3, oxygen vacancies cluster around intrinsic Fe vacancies, leading to nanopore formation, whereas in Fe3O4, vacancy aggregation is suppressed, preserving a dense structure.
Yupeng Wu, Dongxiang Wu, Wenhui Zhu, Xiaobo Chen, Zhikang Zhou, Zhilu Liang, Shuonan Ye, Meng Li, Xiao Tong, Kim Kisslinger, Sooyeon Hwang, Dmitri Zakharov, Renu Sharma, Judith C. Yang, Guangwen Zhou   +14 more
wiley   +1 more source

Three-Dimensional Singular Stress Fields and Interfacial Crack Path Instability in Bicrystalline Superlattices of Orthorhombic/Tetragonal Symmetries

Crystals
First, a recently developed eigenfunction expansion technique, based in part on the separation of the thickness variable and partly utilizing a modified Frobenius-type series expansion technique in conjunction with the Eshelby–Stroh formalism, is ...
Reaz A. Chaudhuri
doaj   +1 more source

Theory of Coupled Multipole Moments Probed by X-ray Scattering in CeB$_6$

, 2004
A minimal model for multipole orders in CeB$_6$ shows that degeneracy of the quadrupole order parameters and strong spin-orbit coupling lead to peculiar temperature and magnetic-field dependences of the X-ray reflection intensity at superlattice Bragg ...
Blume M., Effantin J. M., Freeman A. J., Kusunose H., Lovesey S. W., Murakami Y., Nagao T., Nakao H., Ohkawa F. J., Shiina R., Tanaka Y., Yakhou F., Zaharko O., Zirngiebl E.   +13 more
core   +1 more source

Spectrally Tunable 2D Material‐Based Infrared Photodetectors for Intelligent Optoelectronics

Advanced Functional Materials, EarlyView.
Intelligent optoelectronics through spectral engineering of 2D material‐based infrared photodetectors. Abstract The evolution of intelligent optoelectronic systems is driven by artificial intelligence (AI). However, their practical realization hinges on the ability to dynamically capture and process optical signals across a broad infrared (IR) spectrum.
Junheon Ha, Yingshan Ma, Yong Nam An, Sung‐Un An, Hyeon Hak Jung, Suvi‐Tuuli Varjamo, Jiwon Yoo, Junho Min, Hanvit Kim, Faisal Ahmed, Sang Hoon Chae, Young Min Song, Weiwei Cai, Tawfique Hasan, Zhipei Sun, Dong‐Ho Kang, Hyeon‐Jin Shin, Yunyun Dai, Hoon Hahn Yoon   +18 more
wiley   +1 more source

InAs/InAsSb Type-II Superlattice Mid-Wavelength Infrared Focal Plane Array With Significantly Higher Operating Temperature Than InSb

IEEE Photonics Journal, 2018
We report focal plane array (FPA) results on a mid-wavelength InAs/InAsSb type-II strained layer superlattice (T2SLS) unipolar barrier infrared detector with a cutoff wavelength of 5.4 μm.
David Z. Ting, Sir B. Rafol, Sam A. Keo, Jean Nguyen, Arezou Khoshakhlagh, Alexander Soibel, Linda Hoglund, Anita M. Fisher, Edward M. Luong, Jason M. Mumolo, John K. Liu, Sarath D. Gunapala   +11 more
doaj   +1 more source

Charge Ordering and Phase Competition in the Layered Perovskite Lasr2mn2o7

, 1999
Charge-lattice fluctuations are observed in the layered perovskite manganite LaSr2Mn2O7 by Raman spectroscopy as high as 340 K and with decreasing temperature they become static and form a charge ordered (CO) phase below TCO=210 K.
A. dos Santos, A. K. Cheetham, B. J. Campbell, D. B. Romero, D. E. Cox, D. E. Cox, D. N. Argyriou, D. N. Argyriou, E. T. Heyen, G. Blumberg, G. F. Strouse, H. A. Mook, H. N. Bordallo, J. B. A. A. Elemans, J. B. Goodenough, J. F. Mitchell, J. K. Furdyna, J. P. Pouget, J. S. Gardner, K. Hanif, L. Vasiliu-Doloc, M. Kubota, M. N. Iliev, M. Takata, P. Calvani, P. D. Battle, P. G. Radaelli, R. J. McQueeney, T. G. Perring, T. Kimura, T. Mizokawa, V. Kiryukhin, Y. Moritomo   +32 more
core   +1 more source

Quasiadiabatic dynamics of ultracold bosonic atoms in a one-dimensional optical superlattice [PDF]

, 2015
We study the quasiadiabatic dynamics of a one-dimensional system of ultracold bosonic atoms loaded in an optical superlattice. Focusing on a slow linear variation in time of the superlattice potential, the system is driven from a conventional Mott ...
Das, B. P., Dhar, A., Rossini, D.
core   +2 more sources

Exciton Binding Energy Modulation in 2D Perovskites: A Phenomenological Keldysh Framework

Advanced Functional Materials, EarlyView.
The intrinsic screening effects are successfully decoupled from structural distortion by rigorously designing a series of 2D perovskites. This enabled us to demonstrate how the dielectric environment modulates the quasiparticle bandgap and exciton binding energy.
Kitae Kim, Namhee Kwon, Sang Woo Park, Wonsik Kim, Seunghwan Kim, Eunki Yoon, Aelim Ha, Donggyu Lee, Young Yong Kim, Jong‐Cheol Lee, Sungho Lee, Junghan Lee, Kyu Hyoung Lee, Yeonjin Yi, Ki‐Ha Hong, Soohyung Park   +15 more
wiley   +1 more source