Small polaron migration associated multiple dielectric responses of multiferroic DyMnO3 polycrystal in low temperature region

J. Yang; J. He; J. Y. Zhu; W. Bai; L. Sun; X. J. Meng; X. D. Tang; C. G. Duan; D. Rémiens; J. H. Qiu; J. H. Chu

doi:10.1063/1.4768790

Small polaron migration associated multiple dielectric responses of multiferroic DyMnO₃ polycrystal in low temperature region

J. Yang^*
, J. He
, J. Y. Zhu
, W. Bai
, L. Sun
, X. J. Meng
, X. D. Tang
, C. G. Duan
, D. Rémiens
, J. H. Qiu
, J. H. Chu

^*Corresponding author for this work

School of Physics and Electronic Science

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

Utilizing temperature dependent dielectric/impedance spectroscopy, multi-dielectric responses involving two dielectric relaxations (DRs) and two magnetic-order-associated dielectric anomalies were observed in polycrystalline DyMnO₃. It is elucidated that both DRs' dynamics, established in terms of equivalent circuit model and small polaron (SP) theories, are closely linked with localized SP migration features. Namely, low-temperature relaxation process can be attributed to short range polaronic variable-range-hopping induced dipolar-type relaxation in grains, whereas the higher-temperature one is due to Maxwell-Wagner relaxation at grain/grain boundary interfaces, which are governed by SP nearest-neighbor-hopping conduction. Additionally, magnetic-orders-associated dielectric anomalies may be assigned to strong spin-lattice couplings by magnetoelasticity-aroused lattice deformation.

Original language	English
Article number	222904
Journal	Applied Physics Letters
Volume	101
Issue number	22
DOIs	https://doi.org/10.1063/1.4768790
State	Published - 26 Nov 2012

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@article{8a7c47cbddde4337950e5448ee95e170,

title = "Small polaron migration associated multiple dielectric responses of multiferroic DyMnO3 polycrystal in low temperature region",

abstract = "Utilizing temperature dependent dielectric/impedance spectroscopy, multi-dielectric responses involving two dielectric relaxations (DRs) and two magnetic-order-associated dielectric anomalies were observed in polycrystalline DyMnO3. It is elucidated that both DRs' dynamics, established in terms of equivalent circuit model and small polaron (SP) theories, are closely linked with localized SP migration features. Namely, low-temperature relaxation process can be attributed to short range polaronic variable-range-hopping induced dipolar-type relaxation in grains, whereas the higher-temperature one is due to Maxwell-Wagner relaxation at grain/grain boundary interfaces, which are governed by SP nearest-neighbor-hopping conduction. Additionally, magnetic-orders-associated dielectric anomalies may be assigned to strong spin-lattice couplings by magnetoelasticity-aroused lattice deformation.",

author = "J. Yang and J. He and Zhu, \{J. Y.\} and W. Bai and L. Sun and Meng, \{X. J.\} and Tang, \{X. D.\} and Duan, \{C. G.\} and D. R{\'e}miens and Qiu, \{J. H.\} and Chu, \{J. H.\}",

year = "2012",

month = nov,

day = "26",

doi = "10.1063/1.4768790",

language = "英语",

volume = "101",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "22",

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TY - JOUR

T1 - Small polaron migration associated multiple dielectric responses of multiferroic DyMnO3 polycrystal in low temperature region

AU - Yang, J.

AU - He, J.

AU - Zhu, J. Y.

AU - Bai, W.

AU - Sun, L.

AU - Meng, X. J.

AU - Tang, X. D.

AU - Duan, C. G.

AU - Rémiens, D.

AU - Qiu, J. H.

AU - Chu, J. H.

PY - 2012/11/26

Y1 - 2012/11/26

N2 - Utilizing temperature dependent dielectric/impedance spectroscopy, multi-dielectric responses involving two dielectric relaxations (DRs) and two magnetic-order-associated dielectric anomalies were observed in polycrystalline DyMnO3. It is elucidated that both DRs' dynamics, established in terms of equivalent circuit model and small polaron (SP) theories, are closely linked with localized SP migration features. Namely, low-temperature relaxation process can be attributed to short range polaronic variable-range-hopping induced dipolar-type relaxation in grains, whereas the higher-temperature one is due to Maxwell-Wagner relaxation at grain/grain boundary interfaces, which are governed by SP nearest-neighbor-hopping conduction. Additionally, magnetic-orders-associated dielectric anomalies may be assigned to strong spin-lattice couplings by magnetoelasticity-aroused lattice deformation.

AB - Utilizing temperature dependent dielectric/impedance spectroscopy, multi-dielectric responses involving two dielectric relaxations (DRs) and two magnetic-order-associated dielectric anomalies were observed in polycrystalline DyMnO3. It is elucidated that both DRs' dynamics, established in terms of equivalent circuit model and small polaron (SP) theories, are closely linked with localized SP migration features. Namely, low-temperature relaxation process can be attributed to short range polaronic variable-range-hopping induced dipolar-type relaxation in grains, whereas the higher-temperature one is due to Maxwell-Wagner relaxation at grain/grain boundary interfaces, which are governed by SP nearest-neighbor-hopping conduction. Additionally, magnetic-orders-associated dielectric anomalies may be assigned to strong spin-lattice couplings by magnetoelasticity-aroused lattice deformation.

UR - https://www.scopus.com/pages/publications/84870543929

U2 - 10.1063/1.4768790

DO - 10.1063/1.4768790

M3 - 文章

AN - SCOPUS:84870543929

SN - 0003-6951

VL - 101

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 22

M1 - 222904

ER -

Small polaron migration associated multiple dielectric responses of multiferroic DyMnO₃ polycrystal in low temperature region

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