Effects of high pressure, magnetic fields, and substitutions - ICMR ...

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Complex p – T phase diagram of DyMn 2 O 5 DyMn 2 O 5 Five phase transitions are visible in distinct changes of εand P b Higher phase complexity, pressure-induced new phase (X – phase) The “X” phase is found to be paraelectric at high pressure (mixed phase ?) Magnetic properties still need to be investigated
Pressure-induced polarization reversal in YMn 2 O 5 YMn 2 O 5 is unique in the RMn 2 O 5 family of compounds – it shows a spontaneous sign change of P at T c2 (Inomata et al., 1996) Problem with pyroelectric current measurements: Poling of FE domains upon cooling is necessary to reveal the intrinsic polarization – measurements are done at E = 0 upon warming poling, E > 0 Additional phase transitions may destroy the FE domain alignment ! This can give rise to spurious effects or incorrect results P (arb. units) measure, E = 0 0 20 40 T (K) Poling to 5 K, ± 200 V
Page 1 and 2: Tuning multiferroics under extreme
Page 3 and 4: 1. Short introduction: Multiferroic
Page 5 and 6: 2. Frustration due to competing int
Page 7 and 8: Novel physical effects in multiferr
Page 9 and 10: 2. Helical magnetic order, exchange
Page 11 and 12: WMnO 4 Frustration due to competing
Page 13 and 14: Symmetry and Landau theory (Kenzelm
Page 15 and 16: Ferroelectricity due to possible ex
Page 17 and 18: 2. Magnetoelastic effects and spin-
Page 20 and 21: Structural distortions in multiferr
Page 22 and 23: Dielectric Anomaly at and below T N
Page 24 and 25: Strong spin-spin and spin-lattice c
Page 26 and 27: Search for structural anomalies at
Page 28 and 29: 3. The effects of high pressure on
Page 30 and 31: Be-Cu cap with wires, sample, and p
Page 32 and 33: Pressure - temperature phase diagra
Page 34 and 35: Pressure effects on magnetic struct
Page 36 and 37: Control of magnetic order (commensu
Page 40 and 41: In multiferroics with a paraelectri
Page 42 and 43: Understanding the pressure effects
Page 44 and 45: Chapon et al. (PRL 2006) explained
Page 46 and 47: Example 1: WMnO 4 In MnWO 4 the Mn
Page 48 and 49: Example 2: CuFeO 2 T. Kimura et al.

Effects of high pressure, magnetic fields, and substitutions - ICMR ...

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