Anisotropy study of multiferroicity in the pyroxene NaFeGe$_2$O$_6$

M. Ackermann; L. Andersen; T. Lorenz; L. Bohaty; P. Becker

doi:10.1088/1367-2630/17/1/013045

paper

Anisotropy study of multiferroicity in the pyroxene NaFeGe $_{2}$ O $_{6}$

arXiv:1408.6772 · doi:10.1088/1367-2630/17/1/013045

Abstract

We present a study of the anisotropy of the dielectric, magnetic and magnetoelastic properties of the multiferroic clinopyroxene NaFeGe $_{2}$ O $_{6}$ . Pyroelectric currents, dielectric constants and magnetic susceptibilities as well as the thermal expansion and the magnetostriction were examined on large synthetic single crystals of NaFeGe $_{2}$ O $_{6}$ . The spontaneous electric polarization detected below $T_{C} ≃ 11.6$ K in an antiferromagnetically ordered state ( $T_{N} ≃ 13$ K) is mainly lying within the $a c$ plane with a small component along $b$ , indicating a triclinic symmetry of the multiferroic phase of NaFeGe $_{2}$ O $_{6}$ . The electric polarization can be strongly modified by applying magnetic fields along different directions. We derive detailed magnetic-field versus temperature phase diagrams and identify three multiferroic low-temperature phases, which are separated by a non-ferroelectric, antiferromagnetically ordered state from the paramagnetic high-temperature phase.

14 pages, 8 figures. (minor modifications and corrections of the text)

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Anisotropy study of multiferroicity in the pyroxene NaFeGe2​O6​

Abstract

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Cited by in corpus (1)

Anisotropy study of multiferroicity in the pyroxene NaFeGe $_{2}$ O $_{6}$