Structure, magnetism, specific heat, and dielectric properties of Eu{sub 2}Ta{sub 2}O{sub 7}

Sakurai, H.; Matsushita, Y.

doi:10.1063/1.4902345

Title: Structure, magnetism, specific heat, and dielectric properties of Eu{sub 2}Ta{sub 2}O{sub 7}

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Abstract

Polycrystalline Eu{sub 2}Ta{sub 2}O{sub 7} containing layered perovskite slabs was prepared and analyzed. Eu{sub 2}Ta{sub 2}O{sub 7} crystallizes in the orthorhombic centrosymmetric Cmcm space group (with unit cell: a = 3.95156(9), b = 27.0775(6), and c = 5.68279(13) Å) isomorphous with high-temperature Sr{sub 2}Ta{sub 2}O{sub 7}. Dielectric measurements reveal that, in contrast to Sr{sub 2}Ta{sub 2}O{sub 7} which is ferroelectric below 166 K, Eu{sub 2}Ta{sub 2}O{sub 7} remains paraelectric down to at least 0.45 K and shows no magneto-dielectric coupling. Magnetic data in the 2–400 K range indicate an antiferromagnetic phase transition with a sharp susceptibility peak at 2.71(5) K. Further analysis using specific heat measurements reveals that the second magnetic phase transition occurs at 1.10(5) K and dominates the spin entropy of the Eu{sup 2+} 4f{sup 7} ions. The possible origin of the two successive magnetic phase transitions in Eu{sub 2}Ta{sub 2}O{sub 7} requires further studies.

Authors:

Sakurai, H.; Matsushita, Y. ^[1]

National Institute for Materials Science, Tsukuba, Ibaraki 305-0044 (Japan)

Publication Date:: Mon Nov 17 00:00:00 EST 2014

OSTI Identifier:: 22392028

Resource Type:: Journal Article

Journal Name:: Applied Physics Letters

Additional Journal Information:: Journal Volume: 105; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; DIELECTRIC PROPERTIES; ENTROPY; EUROPIUM COMPOUNDS; EUROPIUM IONS; FERROELECTRIC MATERIALS; ORTHORHOMBIC LATTICES; PEROVSKITE; PHASE TRANSFORMATIONS; POLYCRYSTALS; SPACE GROUPS; SPECIFIC HEAT; SPIN; STRONTIUM COMPOUNDS; TANTALATES

Citation Formats


                    Kolodiazhnyi, T., E-mail: kolodiazhnyi.taras@nims.go.jp, Sakurai, H., and Matsushita, Y. Structure, magnetism, specific heat, and dielectric properties of Eu{sub 2}Ta{sub 2}O{sub 7}.  United States: N. p., 2014. 
        Web.  doi:10.1063/1.4902345.

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                    Kolodiazhnyi, T., E-mail: kolodiazhnyi.taras@nims.go.jp, Sakurai, H., & Matsushita, Y. Structure, magnetism, specific heat, and dielectric properties of Eu{sub 2}Ta{sub 2}O{sub 7}.  United States.  https://doi.org/10.1063/1.4902345

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                    Kolodiazhnyi, T., E-mail: kolodiazhnyi.taras@nims.go.jp, Sakurai, H., and Matsushita, Y. 2014.  
        "Structure, magnetism, specific heat, and dielectric properties of Eu{sub 2}Ta{sub 2}O{sub 7}".  United States.  https://doi.org/10.1063/1.4902345.

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@article{osti_22392028,

  title        = {Structure, magnetism, specific heat, and dielectric properties of Eu{sub 2}Ta{sub 2}O{sub 7}},

  author       = {Kolodiazhnyi, T., E-mail: kolodiazhnyi.taras@nims.go.jp and Sakurai, H. and Matsushita, Y.},

  abstractNote = {Polycrystalline Eu{sub 2}Ta{sub 2}O{sub 7} containing layered perovskite slabs was prepared and analyzed. Eu{sub 2}Ta{sub 2}O{sub 7} crystallizes in the orthorhombic centrosymmetric Cmcm space group (with unit cell: a = 3.95156(9), b = 27.0775(6), and c = 5.68279(13) Å) isomorphous with high-temperature Sr{sub 2}Ta{sub 2}O{sub 7}. Dielectric measurements reveal that, in contrast to Sr{sub 2}Ta{sub 2}O{sub 7} which is ferroelectric below 166 K, Eu{sub 2}Ta{sub 2}O{sub 7} remains paraelectric down to at least 0.45 K and shows no magneto-dielectric coupling. Magnetic data in the 2–400 K range indicate an antiferromagnetic phase transition with a sharp susceptibility peak at 2.71(5) K. Further analysis using specific heat measurements reveals that the second magnetic phase transition occurs at 1.10(5) K and dominates the spin entropy of the Eu{sup 2+} 4f{sup 7} ions. The possible origin of the two successive magnetic phase transitions in Eu{sub 2}Ta{sub 2}O{sub 7} requires further studies.},

  doi          = {10.1063/1.4902345},

  url          = {https://www.osti.gov/biblio/22392028},
  journal      = {Applied Physics Letters},

  issn         = {0003-6951},

  number       = 20,

  volume       = 105,

  place        = {United States},

  year         = {Mon Nov 17 00:00:00 EST 2014},

  month        = {Mon Nov 17 00:00:00 EST 2014}

}

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