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

More documents

Recommendations

Info

Example 1: WMnO 4 In MnWO 4 the Mn 2+ - ion can be replaced by Fe 2+ : Tuning of magnetic exchange and anisotropy in Mn 1-x Fe x WO 4 possible Phase diagram from neutron scattering Ground state: AF1 – Phase (E-type), PE AF3 – Phase: IC collinear (sinusoidal), PE AF2 – Phase (x=0) : IC non-collinear (helical), FE Does ferroelectricity exist for x > 0 ?
Growth of a series of large single crystals with x Fe = 0.25, 0.1, 0.05, 0.035, 0.02 40 30 Mn 1-x Fe x WO 4 x = 0.00 x = 0.02 x = 0.035 x = 0.05 P (μC/m 2 ) 20 10 x = 0.035 0 4 6 8 10 12 14 16 Phase diagram T (K) T (K) 18 16 14 12 10 Mn 1-x Fe x WO 4 Sinusoidal / ICM / PE ICM / FE CM / PE / E type 8 0.00 0.02 0.04 0.06 0.08 0.10 Concentration (x) The ferroelectric (helical) phase is completely suppressed by Fe substitution as low as 4 % For x > 0.04 the transition from the ICM collinear (sinusoidal) phase proceeds directly into the commensurate (E-type) phase, both phases are paraelectric. Confirmed by neutron scattering experiments.
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 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 48 and 49: Example 2: CuFeO 2 T. Kimura et al.

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

Create successful ePaper yourself

Delete template?

Save as template?