排序方式: 共有13条查询结果,搜索用时 15 毫秒
11.
Yan JQ Zhou JS Goodenough JB Ren Y Cheng JG Chang S Zarestky J Garlea O Llobet A Liobet A Zhou HD Sui Y Su WH McQueeney RJ 《Physical review letters》2007,99(19):197201
The effect of the average R-site ionic radius IR and variance on the orbital and magnetic order in R3+-doped YVO3 was studied in Y1-xLaxVO3 and Y1-x(La0.2337Lu0.7663)xVO3 with fixed IR. The orbital flipping temperature T{CG} increases nonlinearly with increasing R-site variance, indicating that the V-O-V bond angle is not the primary driving force stabilizing the C-type orbitally ordered phase. The suppressed thermal conductivity in the G-type orbitally ordered phase signals some remaining orbital randomness that is enhanced by t{2} and et hybridization in {3}T{1g} site symmetry. 相似文献
12.
V. O. Garlea B. C. Chakoumakos S. A. Moore G. B. Taylor T. Chae R. G. Maples R. A. Riedel G. W. Lynn D. L. Selby 《Applied Physics A: Materials Science & Processing》2010,98(3):531-535
Neutron powder diffraction is increasingly recognized as one of the most powerful techniques for studying the structural and
magnetic properties of advanced materials. Despite the growing demand to study an ever-increasing array of interesting materials,
there is only a handful of neutron diffractometers available to serve the US neutron scattering community. This article describes
the new high-resolution powder diffractometer that has recently been installed at the High Flux Isotope Reactor in Oak Ridge.
The instrument is designed to provide an optimum balance between high neutron flux and high resolution. Due to its versatility
the diffractometer can be employed for a large variety of experiments, but it is particularly adapted for refinements of structures
with large interplanar spacings as well as of complex magnetic structures. In addition to traditional crystal and magnetic
structural refinements, studies of phase transitions, thermal expansion, texture analysis, and ab initio structure solution
from powder data can be undertaken. 相似文献
13.
Zheludev A Garlea VO Regnault LP Manaka H Tsvelik A Chung JH 《Physical review letters》2008,100(15):157204
Temperature dependencies of gap energies and magnon lifetimes are measured in the quasi-one-dimensional S=1/2 gapped quantum magnets (CH3)(2)CHNH(3)CuCL(3) (IPA-CuCl(3), where IPA denotes isopropyl ammonium) and Cu(2)Cl(4).D(8)C(4)SO(2) (Sul-Cu(2)Cl(4)) using inelastic neutron scattering. The results are compared to those found in literature for S=1 Haldane spin chain materials and to theoretical calculations for the O(3)- and O(N)- quantum nonlinear sigma-models. It is found that when the T=0 energy gap Delta is used as the temperature scale, all experimental and theoretical curves are identical to within system-dependent but temperature-independent scaling factors of the order of unity. This quasi-universality extends over a surprising broad T range, at least up to kappaT approximately 1.5 Delta. 相似文献