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P. G. Freeman,S. R. Giblin,K. Hradil,R. A. Mole,D. Prabhakaran 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
The magnetic excitation spectrums of charge stripe ordered La2−xSrxNiO4 x = 0.45 and x = 0.4were studied by inelastic neutron scattering. We found the magnetic excitation spectrum of x = 0.45from the ordered Ni2+ S = 1 spins to match that of checkerboard charge ordered La1.5Sr0.5NiO4. The distinctive asymmetry in the magnetic excitations above 40meV was observed for both doping levels, but an additional ferromagnetic mode was observed in x = 0.45 and not in the x = 0.4. We discuss the origin of crossover in the excitation spectrum between x = 0.45 and x = 0.4 with respect to discommensurations in the charge stripe structure.
Magnetic Order in YbMn2Si2 - Neutron Scattering Investigation
S. J. Campbell,M. Hofmann,R. A. Mole,K. Prokes,D. Wallacher,J. L. Wang 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Several mechanisms have been proposed to account for the structural and magnetic behaviour ofthe rare earth intermetallic compound YbMn2Si2 below the transition that occurs around 30 K. We have carried out detailed neutron diffraction measurements over the temperature range 0.3 -52 K and confirm both an antiferromagnetic structure with ferromagnetic Mn (001) planes coupledantiferromagnetically along the c-axis above 30 K and the absence of ordering of the Yb sublatticedown to 0.3 K. The decrease in intensity of the (111) reflection around 30 K together with theappearance of satellite reflections of propagation vector k = 00 12 confirm that the magnetic unitcell doubles along the c axis below TN2. The resultant molecular field acting on half of the ionsbelow 30 K removes the degeneracy of the Kramers doublets of the Yb3+ ions and accounts forthe additional excitations observed below 30 K compared with the inelastic neutron scatteringabove 30 K.