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Magnetic phase diagram of the multiferroic FeTe$_2$O$_5$Br | | M. Pregelj
; A. Zorko
; O. Zaharko
; Z. Kutnjak
; M. Jagodič
; Z. Jagličić
; H. Berger
; M. de Souza
; C. Balz
; M. Lang
; D. Arčon
; | | Date: |
20 Aug 2010 | | Abstract: | The low-temperature magnetic phase diagram of the multiferroic system
FeTe$_2$O$_5$Br down to 300 mK and up to 9 T is presented. Short-range magnetic
correlations within the crystal layers start to develop already at $sim$50 K,
i.e., far above $T_{N1} sim$ 11.0 K, where the system undergoes a magnetic
phase transition into the high-temperature incommensurate (HT-ICM) phase. Only
0.5 K lower, at $T_{N2}$, the system undergoes a second phase transition into
the low-temperature incommensurate amplitude-modulated (LT-ICM) phase
accompanied by a spontaneous electric polarization. When the magnetic field is
applied, the transition temperatures shift depending on the field orientation.
In the case of $B||b$ and $B >$ 4.5 T, the HT-ICM phase disappears along with
the electric polarization in the LT-ICM phase. The field dependence of the
magnetic transition temperatures is explained in the context of the magnetic
susceptibility behavior. Similarities and differences between the novel
amplitude-modulated and well-established helicoidal magnetoelectrics are
discussed. | | Source: | arXiv, 1008.3487 | | Services: | Forum | Review | PDF | Favorites | |
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