μSR Measurements of the Magnetism of Sr3Fe2O7

[摘要] We present a preliminary report of zero and transverse field μSR measurements in a high quality single crystal of fully oxygenated Sr3Fe2O7[1], the insulating 3d magnetic analogue of the well studied Sr3Ru2O7, in its charge-disproportionated state, through the magnetic transition to the incommensurate phase at TN ∼ 115 K. A very broad distribution of static fields below Tn yields a large (2/3) missing fraction. Rapidly damped zero field oscillations indicate a large internal field at the muon, estimated to be 0.46 T at 0 K. In the paramagnetic state, we find two muon precession frequencies at 0.25 T applied field, reminiscent of the Mössbauer spectra.

[发布机构] Chemistry Department, University of British Columbia, Vancouver; BC; V6T 1Z1, Canada^1;Max-Planck-Institut für Festkörperforschung, Stuttgart; D-70569, Germany^2;Department of Physics, University of British Columbia, Vancouver; BC; V6T 1Z1, Canada^3;Department of Physics, University of Alberta, Edmonton; AB; T6G 2E1, Canada^4;TRIUMF, Vancouver; BC; V6T 2A3, Canada^5;Department of Inorganic Chemistry, University of Bayreuth, Bayreuth; D-95440, Germany^6;IBS-CCES, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul; 151-747, Korea, Republic of^7

[关键词] High quality single crystals;Incommensurate phase;Internal field;Magnetic transitions;Measurements of;Paramagnetic state;Precession frequency;Transverse field