Spin-Driven Multiferroic Properties of PbMn7O12 Perovskite
Version 2 2016-06-14, 16:07
Version 1 2016-05-26, 21:18
Posted on 2016-05-27 - 00:00
We
synthesize PbMn7O12 perovskite under high-pressure
(6 GPa) and high-temperature (1373 K) conditions and investigate its
structural, magnetic, dielectric, and ferroelectric properties. We
find that PbMn7O12 exhibits rich physical properties
from interplay among charge, orbital, and spin degrees of freedom
and rich structural properties. PbMn7O12 crystallizes
in space group R3̅ near room temperature and
shows a structural phase transition at TCO = 397 K to a cubic structure in space group Im3̅;
the Im3̅-to-R3̅ transition
is associated with charge ordering. Below TOO = 294 K, a structural modulation transition associated with orbital
ordering takes place. There are two magnetic transitions with Néel
temperatures of TN1 = 83 K and TN2 = 77 K and probably a lock-in transition
at TN3 = 43 K (on cooling). There is huge
hysteresis on specific heat (between ∼37 and 65 K at 0 Oe),
dielectric constant (between ∼20 and 70 K at 0 Oe), and dc
and ac magnetic susceptibilities around the lock-in transition. Sharp
dielectric constant, dielectric loss, and pyroelectric current anomalies
are observed at TN2, indicating that electric
polarization is developed at this magnetic transition, and PbMn7O12 perovskite is a spin-driven multiferroic. Polarization
of PbMn7O12 is measured to be ∼4 μC/m2. Field-induced transitions are detected at ∼63 and
∼170 kOe at 1.6–2 K; similar high-magnetic field properties
are also found for CdMn7O12, CaMn7O12, and SrMn7O12. PbMn7O12 exhibits a quite small magnetodielectric effect, reaching
approximately −1.3 to −1.7% at 10 K and 90 kOe.
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Belik, Alexei A.; Glazkova, Yana S.; Terada, Noriki; Matsushita, Yoshitaka; Sobolev, Alexey V.; Presniakov, Igor A.; et al. (2016). Spin-Driven Multiferroic Properties of PbMn7O12 Perovskite. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.6b00774
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AUTHORS (10)
AB
Alexei A. Belik
YG
Yana S. Glazkova
NT
Noriki Terada
YM
Yoshitaka Matsushita
AS
Alexey
V. Sobolev
IP
Igor A. Presniakov
NT
Naohito Tsujii
SN
Shigeki Nimori
KT
Kanji Takehana
YI
Yasutaka Imanaka
KEYWORDS
PbMn 7 O 12 exhibitsT COCdMn 7 O 1283 KSrMn 7 O 12modulation transitionmagnetodielectric effect397 K43 K90 kOeCaMn 7 O 12dielectric lossPbMn 7 O 12 crystallizes65 K10 KT OOphase transitionPbMn 7 O 12 Perovskite294 KT N 3T N 177 KT N 2PbMn 7 O 12 perovskitePbMn 7 O 1270 KSharp dielectricroom temperature