新型具有Ni3TeO6结构的电极化磁性氧化物：Mn2FeWO6

 （Mn2FeWO6 : a New Ni3TeO6 -Type Polar and Magnetic Oxide）

M.R. Li , M. Croft , P. W. Stephens , M. Ye , D. Vanderbilt , M. Retuerto , Z. Deng , C. P. Grams , J. Hemberger , J. Hadermann , W.M. Li , C.Q. Jin , F. O. Saouma , J. I. Jang , H. Akamatsu , V. Gopalan , D. Walker , and M. Greenblatt

Adv. Mater. 27, 2177 (2015)

　　

　A quantum critical point (QCP) occurs upon chemical doping of the weak itinerant ferromagnet Sc3.1In. Remarkable for a system with no local moments, the QCP is accompanied by non-Fermi liquid behavior, manifested in the logarithmic divergence of the specific heat both in the ferro-and the paramagnetic states, as well as linear temperature dependence of the low-temperature resistivity.With doping, critical scaling is observed close to the QCP, as the critical exponents δ, γ, and β have weak composition dependence, with δ nearly twice and β almost half of their respective mean-field values. The unusually large paramagnetic moment μPM ～ 1.3μB/F.U. is nearly composition independent. Evidence for strong spin fluctuations, accompanying the QCP at xc =0.035 ±0.005, may be ascribed to the reduced dimensionality of Sc3.1In, associated with the nearly one-dimensional Sc-In chains.