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

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Experimental discovery of a new fundamental excitation – The electromagnon Theoretically predicted in 1970: Hybrid excitation of a phonon and a magnon due to strong spin-phonon coupling Low-energy excitation (10 ... 20 cm -1 ) predicted in optical experiments (electric field can excite a magnon) magnon phonon Experimentally confirmed in 2006 in different multiferroic compounds:
2. Helical magnetic order, exchange striction, and double exchange as possible sources of FE Search for common features (magnetic orders) in different MF compounds: The important role of neutron scattering experiments as the key investigation TbMnO 3 HT IC order sinusoidal modulation LT IC order helical (spiral) modulation (spatial inversion symmetry is broken)
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: Novel physical effects in multiferr
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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