Ferroelectricity Induced by Incommensurate–Commensurate Magnetic Phase Transition in Multiferroic HoMn<sub>2</sub>O<sub>5</sub>

Kimura, Hiroyuki; Kamada, Youichi; Noda, Yukio; Kaneko, Koji; Metoki, Naoto; Kohn, K.

doi:10.1143/jpsj.75.113701

Cited by 41 publications

(63 citation statements)

References 17 publications

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“…Fig. 3(d) shows a similar plot as a function of temperature obtained under an applied magnetic field, where the CM phase is also induced by applying a magnetic field [11]. With increasing magnetic field, the sum of the intensity below ∼ 20 K rapidly decreases and the temperature evolution almost saturates above H = 2.5 T, while the intensity above ∼ 20 K is almost temperature-independent.…”

mentioning

confidence: 55%

“…All the magnetic phases are characterized by a magnetic propagation wave vector q M = (q x 0 q z ), where the periodicity of the magnetic order along both the a-and c-axes is modulated. Details of the magnetic and dielectric properties under ambient pressure have been reported elsewhere [11].…”

mentioning

confidence: 99%

“…Above T ∼ 22 K, there is a weak pressure dependence of the intensity variation for (d), respectively. The data under magnetic field is taken from Kimura et al [11].…”

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confidence: 99%

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Pressure-Induced Commensurate Magnetic Order in Multiferroic HoMn₂O₅

et al. 2008

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The pressure (p) -temperature (T ) phase diagram for microscopic magnetism in the multiferroic compound HoMn2O5 was established using neutron diffraction measurements under a hydrostatic pressure up to 1.25 GPa. At ambient pressure, incommensurate-commensurate-incommensurate magnetic phase transitions occur successively with decreasing temperature. Upon applying pressure, the incommensurate phase at the lowest temperature almost decreases and the commensurate phase appears. The p -T phase diagram established shows excellent agreement with the recently reported p -T dielectric phase diagram, where ferroelectricity is induced by applying pressure. We also found that the p -T magnetic phase diagram is quite similar to the previously obtained magnetic field-temperature phase diagram.The coexistence of and spontaneous ordering of (anti) ferromagnetism and ferroelectricity, referred to as multiferroics, has recently been identified in certain materials. Both the scientific and technological aspects of these materials have attracted much attention owing to the possible colossal magnetoelectric (ME) effect, in which the electric polarization can be controlled by a magnetic field, or conversely, the magnetization can be controlled by an electric field. The series of rare-earth manganese compounds RMn 2 O 5 (R = rare earth, Bi, and Y) is a prototype multiferroic system that exhibits the colossal ME effect [1,2]. As shown in Fig. 1, this system has two independent Mn sites of Mn 3+ and Mn 4+ ions, a network of which surrounds the R 3+ ion. Furthermore, there are at least five different paths (J 1 ∼ J 5 in Fig. 1) of Mn-Mn exchange interactions [3]. These geometrical configurations potentially involve magnetic frustration, resulting in a complex phase sequence of multiple magnetic tran- It was recently found that a hydrostatic pressure of around 1 GPa can have a dramatic effect on the dielectric properties of Ni 3 V 2 O 8 and RMn 2 O 5 : ferroelectricity is suppressed in the former, [14] while in the latter system, ferroelectricity is restored [15] by applying pressure. In contrast to the case of an external magnetic field, where the magnetic field can directly couple to spins, pressure can tune the magnetic interaction between neighboring spins by decreasing the interatomic distance, and by changing the bond angles. A small change in the arrangement around magnetic ions causes magnetic phase transitions because of the magnetic frustration, which yields dielectric phase transitions in multiferroic systems. However, no microscopic evidence of pressure-induced magnetic phase transitions has yet been found in any multiferroic system. Thus, in the present study, we performed neutron diffraction measurements under hydrostatic pressure in the multiferroic HoMn 2 O 5 system in search for microscopic magnetic responses to pressure and to determine the relationship between the magnetic response and the dielectric response.

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Pressure-Induced Commensurate Magnetic Order in Multiferroic HoMn₂O₅

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“…The suggestion that the magnetic field stabilized the CM/FE1 phase was confirmed by neutron scattering experiments. 27 In analogy, we propose that isotropic pressure changes the incommensurate magnetic modulation toward a commensurate one above a critical value. Neutron scattering experiments under hydrostatic pressure are thus recommended to confirm this suggestion.…”

Section: A Dielectric Constant Measurements Under Isotropic Pressurementioning

confidence: 96%

“…12,19,27 Full quenching of the step occurred at 14 T for HoMn 2 O 5 . 19 This observation has been associated with the magnetic fieldinduced transition of the magnetic order from incommensurate to commensurate, such that the ferroelectricity is stabilized.…”

Section: A Dielectric Constant Measurements Under Isotropic Pressurementioning

confidence: 97%

Pressure-induced enhancement of ferroelectricity in multiferroicRMn2O5(R=
Cruz
¹
,
Lorenz
²
,
Sun
³

et al. 2007
Phys. Rev. B
67
4
25
0
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Measurements of ferroelectric polarization and dielectric constant were done on RMn 2 O 5 ͑R =Tb,Dy,Ho͒ with applied hydrostatic pressures of up to 18 kbar. At ambient pressure, distinctive anomalies were observed in the temperature profile of both physical properties at critical temperatures marking the onset of long range antiferromegnetic order ͑T N1 ͒ and ferroelectricity ͑T C1 ͒, as well as at temperatures when anomalous changes in the polarization, dielectric constant, and spin wave commensurability have been previously reported. In particular, the step in the dielectric constant at low temperatures ͑T C2 ͒, associated with both a drop in the ferroelectric polarization and an incommensurate magnetic structure, was shown to be suddenly quenched upon passing an R-dependent critical pressure. This was shown to correlate with the stabilization of the high ferroelectric polarization state, which is coincident with the commensurate magnetic structure. The observation is suggested to be due to a pressure-induced phase transition into a commensurate magnetic structure, as exemplified by the pressure-temperature ͑p-T͒ phase diagrams constructed in this work. The p-T phase diagrams are determined for all three compounds.

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Theoretical study of static and dynamic properties of orthorhombic multiferroic substances

Wesselinowa¹,

Georgiev²

2008

Physica Status Solidi (b)

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The influence of the magnetoelectric coupling and the exchange interaction constants on different magnetic and dielectric properties of orthorhombic RMn2O5 multiferroic materials is studied based on the transverse Ising and Heisenberg models using a Green's function technique. In the vicinity of the phase transition temperature TC we obtain an anomaly, a kink in the temperature dependence of the magnetic properties. This is due to the coexistence of ferroelectricity and magnetism which leads to interplay between the electric and magnetic properties. The spin excitations show a novel softening around TC due to the magnetoelectric coupling. The effect of external electric and magnetic fields is also calculated. We obtain the magnetic‐field‐induced polarization and the electric‐field‐induced magnetization. The obtained results are in qualitative agreement with the experimental data. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Ferroelectricity Induced by Incommensurate–Commensurate Magnetic Phase Transition in Multiferroic HoMn₂O₅

Cited by 41 publications

References 17 publications

Pressure-Induced Commensurate Magnetic Order in Multiferroic HoMn₂O₅

Pressure-Induced Commensurate Magnetic Order in Multiferroic HoMn₂O₅

Pressure-induced enhancement of ferroelectricity in multiferroicRMn2O5(R=
Cruz
¹
,
Lorenz
²
,
Sun
³

et al. 2007
Phys. Rev. B
67
4
25
0
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Theoretical study of static and dynamic properties of orthorhombic multiferroic substances

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Ferroelectricity Induced by Incommensurate–Commensurate Magnetic Phase Transition in Multiferroic HoMn2O5

Cited by 41 publications

References 17 publications

Pressure-Induced Commensurate Magnetic Order in Multiferroic HoMn2O5

Pressure-Induced Commensurate Magnetic Order in Multiferroic HoMn2O5

Pressure-induced enhancement of ferroelectricity in multiferroicRMn2O5(R=Cruz1, Lorenz2, Sun3 et al. 2007Phys. Rev. B674250View full textAdd to dashboardCite

Theoretical study of static and dynamic properties of orthorhombic multiferroic substances

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Ferroelectricity Induced by Incommensurate–Commensurate Magnetic Phase Transition in Multiferroic HoMn₂O₅

Pressure-Induced Commensurate Magnetic Order in Multiferroic HoMn₂O₅

Pressure-Induced Commensurate Magnetic Order in Multiferroic HoMn₂O₅

Pressure-induced enhancement of ferroelectricity in multiferroicRMn2O5(R=
Cruz
¹
,
Lorenz
²
,
Sun
³

et al. 2007
Phys. Rev. B
67
4
25
0
View full text Add to dashboard Cite