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

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Competing interactions in RMnO 3 O Magnetic phase diagram of orthorhombic RMnO 3 Mn a b R Superexchange couplings Mn 3+ -O -Mn 3+ : J 1 0 (AFM) depend on bond angle Φ (Mn-O-Mn), which is controlled by size of R Frustration and “exotic” phases near Φ ≈145 deg
Novel physical effects in multiferroic compounds: Ferroelectricity induced by magnetic orders ( e.g. TbMnO 3 , Ni 3 V 2 O 8 , MnWO 4 ) Rotation of FE polarization by 90˚ in magnetic fields ( TbMnO 3 , MnWO 4 ) Complete reversal of FE polarization by magnetic fields ( TbMn 2 O 5 ) Giant magneto-dielectric effect in DyMn 2 O 5 (increase of dielectric constant by more than 100 % in magnetic fields) Ferromagnetic order induced by electric fields ( HoMnO 3 ) Complex magnetic phase diagrams with incommensurate and commensurate magnetic structures, lock-in transitions, and multicritical points Experimental discovery of a new excitation - electromagnons . . . . .
Page 1 and 2: Tuning multiferroics under extreme
Page 3 and 4: 1. Short introduction: Multiferroic
Page 5: 2. Frustration due to competing int
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 38 and 39: Complex p - T phase diagram of DyMn
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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