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

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Observation of a multiferroic critical end point

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Title
Observation of a multiferroic critical end point
Author
Kim, Jae WookHaam, SYOh, Yoon SeokPark, SCheong, SWSharma, PAJaime, MHarrison, NHan, Jung HoonJeon, Gun-SangColeman, PKim, Kee Hoon
Issue Date
2009-09
Publisher
NATL ACAD SCIENCES
Citation
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.106, no.37, pp.15573 - 15576
Abstract
The study of abrupt increases in magnetization with magnetic field known as metamagnetic transitions has opened a rich vein of new physics in itinerant electron systems, including the discovery of quantum critical end points with a marked propensity to develop new kinds of order. However, the electric analogue of the metamagnetic critical end point, a "metaelectric" critical end point, has been rarely studied. Multiferroic materials wherein magnetism and ferroelectricity are cross-coupled are ideal candidates for the exploration of this novel possibility using magnetic-field (H) as a tuning parameter. Herein, we report the discovery of a magnetic-field-induced metaelectric transition in multiferroic BiMn2O5, in which the electric polarization (P) switches polarity along with a concomitant Mn spin-flop transition at a critical magnetic field Hc. The simultaneous metaelectric and spin-flop transitions become sharper upon cooling but remain a continuous cross-over even down to 0.5 K. Near the P = 0 line realized at μ0Hc ≈18 T below 20 K, the dielectric constant (ε) increases significantly over wide field and temperature (T) ranges. Furthermore, a characteristic power-law behavior is found in the P(H) and ε(H) curves at T = 0.66 K. These findings indicate that a magnetic-field-induced metaelectric critical end point is realized in BiMn 2O5 near zero temperature.
URI
https://scholarworks.unist.ac.kr/handle/201301/12064
URL
http://www.pnas.org/content/106/37/15573
DOI
10.1073/pnas.0907589106
ISSN
0027-8424
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PHY_Journal Papers
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