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

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Ni 3 V 2 O 8 Magnetic frustration is due to the geometry (kagome) with AFM exchange Only LTI phase is ferroelectric ! HT IC order sinusoidal modulation, inversion symmetry LT IC order helical (spiral) modulation, no IS Commensurate order sinusoidal modulation, inversion symmetry
WMnO 4 Frustration due to competing intrachain interactions (FM / AFM) Same phase sequence: PM → Coll. ICM AF3 → Helical ICM AF2 (ferroelectric) → Coll. CM AF1 ( ↑↑↓↓ ) Very different compounds and structures reveal similar phenomena: Ferroelectricity arising in a spiral magnetic phase The microscopic origin of FE is the symmetry of the magnetic order (breaking the spatial inversion)
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: 2. Helical magnetic order, exchange
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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