Determination of the intrinsic ferroelectric polarization in orthorhombic HoMnO3

Abstract

Whether large ferroelectric polarization P exists in the orthorhombic HoMnO3 with the E-type antiferromagnetic spin ordering or not remains as one of unresolved, challenging issues in the physics of multiferroics. The issue is closely linked to an intriguing experimental difficulty for determining P of polycrystalline specimens that conventional pyroelectric current measurements performed after a poling procedure under high dc electric fields are subject to large errors due to the problems caused by leakage currents or space charges. To overcome the difficulty, we employed the PUND method, which uses successively the two positive and two negative electrical pulses, to directly measure electrical hysteresis loops in several polycrystalline HoMnO3 specimens below their Néel temperatures. We found that all the HoMnO3 samples had similar remnant polarization Pr values at each temperature, regardless of their variations in resistivity, dielectric constant, and pyroelectric current levels. Moreover, Pr of ~0.07 μ\C/cm2 at 6 K is consistent with the P value obtained from the pyroelectric current measurement performed after a short pulse poling. Our findings suggest that intrinsic P of polycrystalline HoMnO3 can be determined through the PUND method and P at 0 K may reach ~0.24 μ\C/cm2 in a single crystalline specimen.

21 pages, 6 figures, submitted to New Journal of Physics

References in corpus (7)

• Spin current and magneto-electric effect in non-collinear magnets
• Magnetically driven ferroelectric order in Ni${}_3$V${}_2$O${}_8$
• Ferroelectricity in the Magnetic E-Phase of Orthorhombic Perovskites
• Dual nature of improper ferroelectricity in a magnetoelectric multiferroic
• Magnetically-induced ferroelectricity in orthorhombic manganites: microscopic origin and chemical trends
• Observation of a multiferroic critical end point
• Complex Spin Structures and Origin of the Magneto-Electric Coupling in YMn2O5

Cited by in corpus (19)

• Field-induced Polar Order at the Néel Temperature of Chromium in Rare-earth Orthochromites: Interplay of Rare-earth and Cr Magnetism
• Determination of Intrinsic Ferroelectric Polarization in Orthorhombic Manganites with E-type Spin Order
• Determination of intrinsic ferroelectric polarization in lossy improper ferroelectric systems
• Multiferroic RMnO3 thin films
• Origin and tuning of room-temperature multiferroicity in Fe doped BaTiO${}_3$
• Spin-spiral inhomogeneity as the origin of ferroelectricity in orthorhombic manganites
• Relationship between crystal structure and multiferroic orders in orthorhombic perovskite manganites
• Electric polarization induced by phase separation in magnetically ordered and paramagnetic states of RMn2O5 (R=Gd, Bi)
• Multiferroic properties of uniaxially compressed orthorhombic HoMnO3 thin films
• Possible coexistence of Cycloidal Phases, Magnetic Field Reversal of Polarization and Memory Effect in Multiferroic \emph{R}${}_{0.5}$Dy${}_{0.5}$MnO${}_3$ (\emph{R}=Eu and Gd)
• Frozen Superparaelectric State of Local Polar Regions in GdMn2O5 and Gd0.8Ce0.2Mn2O5
• Electric Polarization in YCrO3 Induced by Restricted Polar Domains of Magnetic and Structural Natures
• Four-spin ring interaction as a source of unconventional magnetic orders in orthorhombic perovskite manganites
• Electric Polarization in ErCrO3 Induced by Restricted Polar Domains
• Effect of Rare-Earth Ions on an Electric Polarization Induced by the Phase Separation Domains in RMn2O5 (R = Er, Tb)
• Frustration of Exchange-Striction Ferroelectric Ordering and Growth of Electric Polarization of Phase Separation Domains in R${}_{0.8}$Ce${}_{0.2}$Mn${}_2$O${}_5$ (R = Er, Tb) Solid Solutions
• Emergent room-temperature ferroelectricity in spark-plasma sintered DyCrO${}_3$ and LaCrO${}_3$
• Nonmonotonic magnetic field dependence of remanent ferroelectric polarization in reduced-graphene-oxide-BiFeO${}_3$ nanocomposite
• Simple 4-segment thermal cycling pyroelectric measurement protocol for differentiating between ferroelectric and non-ferroelectric materials