Microscopic magnetic nature of K2NiF4-type 3d transition metal oxides

[摘要] In order to elucidate the magnetic nature of K2NiF4-type 3d transition metal oxides, we have measured μ+SR spectra for Sr2VO4, LaSrVO4, and Sr2CrO4 using powder samples. ZF- and wTF-μ+SR measurements propose that Sr2VO4 enters into the static antiferromagnetic (AF) order phase below 8 K. In addition, TF-μ+SR measurements evidence that the transition at 105 K is not magnetic but structural and/or electronic in origin. For LaSrVO4, static long-range order has not been observed down to 20 K, while, as T decreases from 145 K, wTF asymmetry starts to decrease below 60 K, suggesting the appearance and evolution of localized magnetic moments below 60 K. For Sr2CrO4, by contrast, both ZF- and wTF-μ+SR have confirmed the presence of antiferromagnetic order below 117 K, as predicted in the χ(T) curve.

[发布机构] Toyota Central Research and Development Laboratories, Inc., 41-1 Yokomichi, Nagakute, Aichi; 480-1192, Japan^1;Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki; 319-1195, Japan^2;TRIUMF, 4004 Wesbrook Mall, Vancouver; BC; V6T 2A3, Canada^3;Department of Physics and Astronomy, University of British Columbia, Vancouver; BC; V6T 1Z1, Canada^4;National Institute for Materials Science, Tsukuba, Ibaraki; 305-0044, Japan^5;Department of Physics, National Sun Yat-Sen University, Kaohsiung; 804, Taiwan^6;Laboratory for Quantum Magnetism, Ecole Polytechnique Federale de Lausanne, CH-1015, Switzerland^7;Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen PSI; CH-5232, Switzerland^8

[关键词] 3d transition metals;Antiferromagnetic orderings;Antiferromagnetics;Localized magnetic moments;Long range orders;Magnetic nature;Ordering phase;Powder samples