CM04.04.05 : Neutron Diffraction Studies of Ni3-xCoxV2O8 with x=0.1 and 0.5

5:00 PM–7:00 PM Apr 3, 2018 (America - Denver)

PCC North, 300 Level, Exhibit Hall C-E

Seongsu Lee1

1, Korea Atomic Energy Research Institute, Daejeon, , Korea (the Republic of)

We study the magnetic structure of multiferroic Ni3-xCoxV2O8 with x=0.1 and 0.5 using neutron powder diffraction. The temperature dependence of the susceptibility indicates that the magnetic order–disorder transition occurs at THTI=8.5 K in both samples. Below THTI, the high-temperature incommensurate magnetic structure is realized, which undergoes a transition to the low-temperature incommensurate phase when the sample is cooled. The temperature evolution of the propagation vector k for x=0.1 is very weak, which confirms previous studies showing that substitution of 3.5% Ni ions by Co ions suppresses the explicit temperature dependence of k that is observed in the parent compound. On the other hand, we found that the vector k for x=0.5 exhibits a definite temperature dependence, which differs from the case of the undoped sample (x=0).