Dresden 2011 – scientific programme

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KR: Fachgruppe Kristallographie

KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)

KR 5.52: Poster

Tuesday, March 15, 2011, 10:45–13:00, P2

Magnetic field induced polarization in the Ba3NbFe3Si2O14 crystal with a chiral spin structure — •Matthias Hudl^1,2, Yusuke Tokunaga³, Yasujiro Taguchi¹, Roland Mathieu², and Yoshinori Tokura^1,3,4 — ¹RIKEN, Adv. Sci. Inst., CERG and CMRG, Wako, Saitama, 3510198 Japan — ²Uppsala University, Dept. Engn. Sci., SE-75121 Uppsala, Sweden — ³ERATO JST, Multiferroics Project, Tokyo 1138656, Japan — ⁴University of Tokyo, Dept. Appl. Phys., Tokyo 1138656, Japan

Single crystals of langasite Ba3NbFe3Si2O14 with a chiral magnetic structure have been synthesized by floating zone method. In this system, the magnetic ions (Fe3+) are arranged in the ab-plane forming planar triangular lattices of triangle units. Below T = 27 K, three spins within a single triangle order uniformly in a 120° spin structure in the ab-plane. This structure is helically modulated from plane to plane along the c-axis. The complex magnetic structure suggests magnetic-field-induced electrical polarization and magnetoelectric effects. We have investigated the magnetic and magnetoelectric properties of the single crystals by magnetization and electrical polarization measurements. While no polarization is induced along the c-axis of the structure for any orientation of the magnetic field, we have observed a field-induced electric polarization along the a-axis direction for applied magnetic fields in the ab-plane up to 14 T. *** M. H. and R. M. thank the Anna Maria Lundin-, Hans Werthén- and Göran Gustafsson Foundation for support. This work was in part supported by JSPS, FIRST program on "Quantum Science on Strong Correlation".