The origin of multiple magnetic and dielectric anomalies of Mn-doped DyMnO3 in low temperature region

Deng, Jianming; Farid, Muhammad Asim; Yang, Ailing; Zhang, Jianxiang; Zhang, Hao; Zhang, Lei; Qiu, Yaming; Yu, Menghong; Zhu, Hao; Zhong, Meiyan; Li, Jian; Li, Guobao; Liu, Laijun; Sun, Junliang; Lin, Jianhua

doi:10.1016/j.jallcom.2017.07.223

Cited by 12 publications

(5 citation statements)

References 41 publications

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“…In addition, such remarkable dielectric properties also strongly depend on the probing frequency, which approximately follows the Arrhenius behavior. Similar phenomenon was also found in many manganites, cuprates, and nickelates, such as La 1−x Ca x MnO 3 , 11 Pr 0.7 Ca 0.3 MnO 3 , 12 Tb/EuMnO 3 , [13][14][15][16] CuTa 2 O 6 , 17 LaCuLiO 4 , 18 LaSrNiO 4 , 19 Li/Ti-doped NiO 20,21 and Ba(Fe 0.5 Nb 0.5 )O 3 . [22][23][24][25][26] Therefore, a better understanding of CCTO will also help to explain the dielectric properties of a large group of materials.…”

Section: Introductionsupporting

confidence: 77%

Localized polarons and conductive charge carriers: Understanding CaCu3Ti4O12 over a broad temperature range

et al. 2019

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CaCu 3 Ti 4 O 12 (CCTO) has a large dielectric permittivity that is independent of the 1 arXiv:1810.08949v3 [cond-mat.mtrl-sci] 17 Nov 2018 probing frequency near the room temperature, which complicated due to the existence of several dynamic processes. Here, we consider the combined effects of localized charge carriers (polarons) and thermally activated charge carriers using a recently proposed statistical model to fit and understand the permittivity of CCTO measured at different frequencies over the whole temperature range accessible by our experiments. We found that the small permittivity at the lowest temperature is related to polaron frozen, while at higher temperatures the rapid increase is associated with the thermal excitation of polarons inducing the Maxwell-Wagner effect, and the final increase of the permittivity is attributed to the thermally activated conductivity. Such analysis enables us to separate the contributions from localized polarons and conductive charge carriers and quantify their activation energies.

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Section: Introductionsupporting

confidence: 77%

Localized polarons and conductive charge carriers: Understanding CaCu3Ti4O12 over a broad temperature range

et al. 2019

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“…Deng et al found that the paramagnetic properties of EuMnO 3−δ materials were changed to antiferromagnetic via modification at the Eu site by Mn cations 82 . Magnetic phase transition from paramagnetic to antiferromagnetic properties has also been reported for DyMnO 3 materials modified with the Mn cation at the Dy-site 83 . Theoretical and experimental studies have suggested that CoTiO 3 -modified Na 0.5 Bi 0.5 TiO 3 materials have complex magnetic properties that are strongly dependent on the location of Co impurities at the A -site or B -site in the host structure 27 , 79 .…”

Section: Resultsmentioning

confidence: 74%

“…Therefore, due to the difference radius with ions of host lattice, the Ba cations possibly caused a chemical pressure, possibly resulting in the change of interaction between them through oxygen vacancies; finally, resulted in modification of magnetic ordering strength. Recent experimental and theoretical studies have suggested that transition metals may fill A - and B -sites in the perovskite structure of lead-free ferroelectrics, thus resulting in complex magnetic properties 27 , 79 – 83 . Liu et al reported that K 0.45 Na 0.49 Li 0.06 NbO 3 materials modified with Cu at the A- site show paramagnetic properties 80 .…”

Section: Resultsmentioning

confidence: 99%

Experimental and theoretical studies on induced ferromagnetism of new (1 − x)Na0.5Bi0.5TiO3 + xBaFeO3−δ solid solution

Dũng

Lam

Nguyen

et al. 2021

Sci Rep

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New solid solution of Na0.5Bi0.5TiO3 with BaFeO3−δ materials were fabricated by sol–gel method. Analysis of X-ray diffraction patterns indicated that BaFeO3−δ materials existed as a well solid solution and resulted in distortion the structure of host Na0.5Bi0.5TiO3 materials. The randomly incorporated Fe and Ba cations in the host Na0.5Bi0.5TiO3 crystal decreased the optical band gap from 3.11 to 2.48 eV, and induced the room-temperature ferromagnetism. Our density-functional theory calculations further suggested that both Ba for Bi/Na-site and Fe dopant, regardless of the substitutional sites, in Na0.5Bi0.5TiO3 lead to the induced magnetism, which is illustrated in terms of the exchange splitting between spin subbands through the crystal field theory and Jahn–Teller distortion effects. Our work proposes a simple method for fabricating lead-free ferroelectric materials with ferromagnetism property for multifunctional applications in smart electronic devices.

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“…The small polaronhopping conduction mechanism is observed for mono-valent K-doped DyMnO 3 (up to 20% of K); however, with a further increase in K content, the variable range-hopping conduction mechanism is observed for Dy 1−x K x MnO 3 [25]. A decrease in the ferroelectric ordering temperature and a rise in the antiferromagnetic transition temperature have been observed due to the doping of Mn at the Dy-site of DyMnO 3 [10].…”

Section: Introductionmentioning

confidence: 93%

“…Few RMnO 3 systems with a smaller/larger R-ionic radii can be stabilized in the orthorhombic/hexagonal phase, depending upon the synthesis conditions [9]. Sometimes, the hexagonal phase is formed during the synthesis of orthorhombic DyMnO 3 (DMO) as it lies on the phase boundary between the orthorhombic and the hexagonal phase [10]. The orthorhombic phase of DMO is reported to exhibit larger magneto-electric coupling than its hexagonal phase [7].…”

Section: Introductionmentioning

confidence: 99%

The effect of rare-earth Gd-substitution on the structural, magnetic and specific heat properties in orthorhombic DyMnO₃ ceramics

Bhoi¹,

Patidar²,

Krishnan³

et al. 2020

J. Phys. D: Appl. Phys.

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The acrylamide polymer gel template method has been adopted to synthesize single phase Dy1–xGdxMnO3 (DGMO, x= 0, 0.05, 0.1, 0.15, 0.2) ceramics. The Rietveld refinement of x-ray diffraction patterns recorded at room temperature suggests that DGMO ceramics are stabilized in an orthorhombic crystal structure with a Pnma space group. Gd3+ cations play an important role in stabilizing the orthorhombic phase and the unit cell volume increases with x. We report the phonon spectra of pure and Gd-substituted DyMnO3 (DMO) and their mode assignments. Raman modes are softened with x due to the relaxation in the stiffness constants upon the increase in the volume of the unit cell. The magnetic transition temperatures corresponding to TN(Dy) and Tlock decrease with the increase in Gd concentration as inferred from the temperature dependent magnetization data (M–T curve). The magnetization value increases below TN(Dy) with the increase in the Gd concentration as observed from the M–T plot. The magnetic hysteresis loop is fitted to extract ferromagnetic and antiferromagnetic/paramagnetic contributions for each composition x. Fittings of M–H loops indicate the increase in the magnetic contribution below TN(Dy) upon increasing the Gd dopant concentrations, while that decreases above TN(Dy). The temperature dependent specific heat data identifies these magnetic transition temperatures TN(Dy), Tlock and TN(Mn). Furthermore, magnetic field dependencies on TN(Dy), Tlock and TN(Mn) are studied in an elaborate manner. Both DMO and DGMO samples are found to be viable candidates for magnetic refrigeration applications in cryogenic temperature region.

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The origin of multiple magnetic and dielectric anomalies of Mn-doped DyMnO3 in low temperature region

Cited by 12 publications

References 41 publications

Localized polarons and conductive charge carriers: Understanding CaCu3Ti4O12 over a broad temperature range

Localized polarons and conductive charge carriers: Understanding CaCu3Ti4O12 over a broad temperature range

Experimental and theoretical studies on induced ferromagnetism of new (1 − x)Na0.5Bi0.5TiO3 + xBaFeO3−δ solid solution

The effect of rare-earth Gd-substitution on the structural, magnetic and specific heat properties in orthorhombic DyMnO₃ ceramics

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The origin of multiple magnetic and dielectric anomalies of Mn-doped DyMnO3 in low temperature region

Cited by 12 publications

References 41 publications

Localized polarons and conductive charge carriers: Understanding CaCu3Ti4O12 over a broad temperature range

Localized polarons and conductive charge carriers: Understanding CaCu3Ti4O12 over a broad temperature range

Experimental and theoretical studies on induced ferromagnetism of new (1 − x)Na0.5Bi0.5TiO3 + xBaFeO3−δ solid solution

The effect of rare-earth Gd-substitution on the structural, magnetic and specific heat properties in orthorhombic DyMnO3 ceramics

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The effect of rare-earth Gd-substitution on the structural, magnetic and specific heat properties in orthorhombic DyMnO₃ ceramics