Zobrazeno 1 - 10
of 561
pro vyhledávání: '"Baca, J."'
Incident Beamline Design for a Modern Cold Triple Axis Spectrometer at the High Flux Isotope Reactor
Autor:
Granroth, G. E., Daum, M., Aczel, A. A., Williams, T. J., Winn, B., Fernandez-Baca, J. A., Mourigal, M., Lumsden, M. D.
Publikováno v:
Nuclear Inst. and Methods in Physics Research, A 1064 (2024) 169440
A modern cold triple axis spectrometer is being planned for the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Here, we describe the design of an incident beamline that will put a flux of $\sim 10^8\mathrm{\frac{n}{cm^2 s}}$ on a
Externí odkaz:
http://arxiv.org/abs/2402.01626
Autor:
Gitgeatpong, G., Zhao, Y., Fernandez-Baca, J. A., Hong, T., Sato, T. J., Piyawongwatthana, P., Nawa, K., Saeaun, P., Matan, K.
Publikováno v:
Phys. Rev. B 106, 214438 (2022)
Magnetic properties of the antiferromagnet Zn$_{0.15}$Cu$_{1.85}$V$_2$O$_7$ (ZnCVO) have been thoroughly investigated on powder and single-crystal samples. The crystal structure determination using powder x-ray and neutron diffraction confirms that Z
Externí odkaz:
http://arxiv.org/abs/2207.04618
Autor:
Liu, Juanjuan, Wang, Jinchen, Sheng, Jieming, Ye, Feng, Taddei, Keith M., Fernandez-Baca, J. A., Luo, Wei, Sun, Guang-Ai, Wang, Zhi-Cheng, Jiang, Hao, Cao, Guang-Han, Bao, Wei
Publikováno v:
Phys. Rev. B 98, 134416 (2018)
Sr2Cr3As2O2 is composed of alternating square-lattice CrO2 and Cr2As2 stacking layers, where CrO2 is isostructural to the CuO2 building-block of cuprate high-Tc superconductors and Cr2As2 to Fe2As2 of Fe-based superconductors. Current interest in thi
Externí odkaz:
http://arxiv.org/abs/1806.04430
Autor:
Ye, Feng, Wang, Jinchen, Sheng, Jieming, Hoffmann, C., Gu, T., Xiang, H. J., Tian, Wei, Molaison, J. J., Santos, A. M. dos, Matsuda, M., Chakoumakos, B. C., Fernandez-Baca, J. A., Tong, X., Gao, Bin, Kim, Jae Wook, Cheong, S. -W.
Publikováno v:
Phys. Rev. B 97, 041112(R) (2018)
We report a single crystal neutron and x-ray diffraction study of the hybrid improper multiferroic Ca3Mn1.9Ti0.1O7 (CMTO), a prototypical system where the electric polarization arises from the condensation of two lattice distortion modes.With increas
Externí odkaz:
http://arxiv.org/abs/1801.06465
Autor:
Merritt, A. M., Castellan, J. -P., Keller, T., Park, S. R., Fernandez-Baca, J. A., Gu, G. D., Reznik, D.
Electron-phonon interaction in copper oxide superconductors is still enigmatic. Strong coupling for certain optic phonons is now well established experimentally, but theoretical understanding is challenging. Scattering of electrons near the Fermi sur
Externí odkaz:
http://arxiv.org/abs/1702.04331
Publikováno v:
Phys. Rev. B 94, 205145 (2016)
We study the effects of charge degrees of freedom on the spin excitation dynamics in quasi-one dimensional magnetic materials. Using the density matrix renormalization group method, we calculate the dynamical spin structure factor of the Hubbard mode
Externí odkaz:
http://arxiv.org/abs/1608.07717
Autor:
Zhang, Chenglin, Lv, Weicheng, Tan, Guotai, Song, Yu, Carr, Scott V., Chi, Songxue, Matsuda, M., Christianson, A. D., Fernandez-Baca, J. A., Harriger, L. W., Dai, Pengcheng
Neutron spin resonance, a collective magnetic excitation coupled to superconductivity, is one of the most prominent features shared by a broad family of unconventional superconductors including copper oxides, iron pnictides, and heavy fermions. In th
Externí odkaz:
http://arxiv.org/abs/1605.06890
Autor:
Tian, W., Cao, Huibo, Wang, Jincheng, Ye, Feng, Matsuda, M., Yan, J. -Q., Liu, Yaohua, Garlea, V. O., Chakoumakos, B. C., Sales, B. C., Fishman, Randy S., Fernandez-Baca, J. A.
We report a neutron diffraction study of the multiferroic mechanism in (ND4)2FeCl5D2O, a molecular compound that exhibits magnetically induced ferroelectricity. This material exhibits two successive magnetic transitions on cooling: a long-range order
Externí odkaz:
http://arxiv.org/abs/1605.05214
Autor:
Durand, A. M., Belanger, D. P., Hamil, T. J., Ye, F., Chi, S., Fernandez-Baca, J. A., Booth, C. H., Abdollahian, Y., Bhat, M.
Bulk and nanoparticle powders of LaCoO3 (LCO) were synthesized, and their magnetic and structural properties were studied using SQUID magnetometry and neutron diffraction. The bulk and large nanoparticles exhibit weak ferromagnetism (FM) below T ~ 85
Externí odkaz:
http://arxiv.org/abs/1410.8450
Autor:
Durand, A. M., Hamil, T. J., Belanger, D. P., Chi, S., Ye, F., Fernandez-Baca, J. A., Abdollahian, Y., Booth, C. H.
Bulk La_wCoO3 particles with w=1.1, 1.0, 0.9, 0.8, and 0.7 were synthesized using starting materials with varying molar ratios of La2O3 and Co3O4. The resulting particles are characterized as LaCoO3 crystals interfaced with a crystalline Co3O4 phase.
Externí odkaz:
http://arxiv.org/abs/1410.8284