Abstract：
:We report on neutron diffraction, thermal expansion, magnetostriction, dielectric, and specific heat measurements on polycrystalline FeCr2S4 in external magnetic fields. The ferrimagnetic ordering temperatures TC ≈ 170 K and the transition at TOO ≈ 10 K, which has been associated with orbital ordering, are only weakly shifted in magnetic fields up to 9 T. The cubic lattice parameter is found to decrease when entering the state below TOO. The magnetic moments of the Cr- and Fe-ions are reduced from the spin-only values throughout the magnetically ordered regime, but approach the spin-only values for fields >5.5 T. Thermal expansion in magnetic fields and magnetostriction experiments indicate a contraction of the sample below about 60 K. Below TOO this contraction is followed by a moderate expansion of the sample for fields larger than ~4.5 T. The transition at TOO is accompanied by an anomaly in the dielectric constant. The dielectric constant depends on both the strength and orientation of the external magnetic field with respect to the applied electric field for T < TOO. A linear correlation of the magnetic-field-induced change of the dielectric constant and the magnetic-field dependent magnetization is observed. This behaviour is consistent with the existence of a ferroelectric polarization and a multiferroic ground state below 10 K.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Bertinshaw J,Ulrich C,Günther A,Schrettle F,Wohlauer M,Krohns S,Reehuis M,Studer AJ,Avdeev M,Quach DV,Groza JR,Tsurkan V,Loidl A,Deisenhofer Jdoi
10.1038/srep06079subject
Has Abstractpub_date
2014-08-15 00:00:00pages
6079issn
2045-2322pii
srep06079journal_volume
4pub_type
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