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Oh, Yoon Seok
Laboratory for Strong Correlation in Quantum Materials
Research Interests
  • Multiferroic
  • Ferroelectric
  • Quantum Magnetism

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Determination of the intrinsic ferroelectric polarization in orthorhombic HoMnO3

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Title
Determination of the intrinsic ferroelectric polarization in orthorhombic HoMnO3
Author
Feng, SMChai, YSZhu, JLManivannan, NOh, Yoon SeokWang, LJYang, YSJin, CQKim, KH
Keywords
Antiferromagnetic spin ordering; Dc electric field; Dielectric constants; Electrical hysteresis; Electrical pulse; Ferroelectric polarization; Multiferroics; P-values; Polycrystalline; Polycrystalline specimen; Pyroelectric current; Remnant polarizations; Short pulse; Single-crystalline; Space charges
Issue Date
2010-07
Publisher
IOP PUBLISHING LTD
Citation
NEW JOURNAL OF PHYSICS, v.12, no.7, pp.073006 -
Abstract
Whether or not a large ferroelectric polarization P exists in the orthorhombic HoMnO3 with E-type antiferromagnetic spin ordering remains one of the unresolved, challenging issues in the physics of multiferroics. The issue is closely linked to an intriguing experimental difficulty in determining the P of polycrystalline specimens, namely 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 positive-up negative-down (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 variation in resistivity, dielectric constant and pyroelectric current levels. Moreover, the Pr value of ∼0.07 μC cm-2 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 the intrinsic P of polycrystalline HoMnO3 can be determined through the PUND method and P at 0 K may reach ∼0.24 μC cm-2 in a single crystalline specimen. This P value is still much smaller than the theoretically predicted one but is one of the largest observed in magnetism induced ferroelectrics. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
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DOI
10.1088/1367-2630/12/7/073006
ISSN
1367-2630
Appears in Collections:
PHY_Journal Papers
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