Quantum paraelectricity in copper-titanates: Magnetic-order driven vitrification

Kumar, Jitender

doi:10.1063/1.4926742

Title: Quantum paraelectricity in copper-titanates: Magnetic-order driven vitrification

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Abstract

Quantum-paraelectric (QP) family character is emergent from shared low-temperature characteristics of SrCu{sub 3}Ti{sub 4}O{sub 12} (SCTO), CaCu{sub 3}Ti{sub 4}O{sub 12} (CCTO), and Ca{sub 0.9}Li{sub 0.1}Cu{sub 3}Ti{sub 4}O{sub 12} (CLCTO) A{sub 1/4}A′{sub 3/4}BO{sub 3} structures featuring antiferro-tilted Ti-O{sub 6} octahedra. Above their magnetic ordering temperatures T{sub N}, permittivity of SCTO and CLCTO follow typical Barrett form, whereas in CCTO, quantum paraelectricity is masked by the huge ε′-step. Hidden QP in CCTO gets revealed by Li-doping at the Ca-site, which considerably up-shifts the temperature scale (from ∼100 K to ∼250 K) of the dielectric step-anomaly in CLCTO. Competing magneto-electricity and quantum fluctuations result in glassy-arrest of the QP degrees of freedom near T{sub N}; manifest as dispersive-deviation of the permittivity (in SCTO and CLCTO) from the low-temperature Barrett saturation. However, quantum criticality (QC) regime being well above T{sub N} registers its presence nevertheless, as the ∼T{sup 2} behaviour of their inverse dielectric susceptibility. Non-compliance to the usual behaviours of dispersive-response vs. bias-field and temperature unambiguously rule out a relaxor origin of the glassy state. We determine a dimensionless thermal window (0.3 ≤ T/T{sub 1} ≤ 0.6) of QC signature, covering typical quantum-paraelectrics.

Authors:: Kumar, Jitender

Publication Date:: Tue Jul 21 00:00:00 EDT 2015

OSTI Identifier:: 22490793

Resource Type:: Journal Article

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 118; Journal Issue: 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COPPER; DEGREES OF FREEDOM; MAGNETIZATION; PERMITTIVITY; TITANATES; VITRIFICATION; WINDOWS

Citation Formats


                    Kumar, Jitender, and Awasthi, A. M., E-mail: amawasthi@csr.res.in. Quantum paraelectricity in copper-titanates: Magnetic-order driven vitrification.  United States: N. p., 2015. 
        Web.  doi:10.1063/1.4926742.

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                    Kumar, Jitender, & Awasthi, A. M., E-mail: amawasthi@csr.res.in. Quantum paraelectricity in copper-titanates: Magnetic-order driven vitrification.  United States.  https://doi.org/10.1063/1.4926742

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                    Kumar, Jitender, and Awasthi, A. M., E-mail: amawasthi@csr.res.in. 2015.  
        "Quantum paraelectricity in copper-titanates: Magnetic-order driven vitrification".  United States.  https://doi.org/10.1063/1.4926742.

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@article{osti_22490793,

  title        = {Quantum paraelectricity in copper-titanates: Magnetic-order driven vitrification},

  author       = {Kumar, Jitender and Awasthi, A. M., E-mail: amawasthi@csr.res.in},

  abstractNote = {Quantum-paraelectric (QP) family character is emergent from shared low-temperature characteristics of SrCu{sub 3}Ti{sub 4}O{sub 12} (SCTO), CaCu{sub 3}Ti{sub 4}O{sub 12} (CCTO), and Ca{sub 0.9}Li{sub 0.1}Cu{sub 3}Ti{sub 4}O{sub 12} (CLCTO) A{sub 1/4}A′{sub 3/4}BO{sub 3} structures featuring antiferro-tilted Ti-O{sub 6} octahedra. Above their magnetic ordering temperatures T{sub N}, permittivity of SCTO and CLCTO follow typical Barrett form, whereas in CCTO, quantum paraelectricity is masked by the huge ε′-step. Hidden QP in CCTO gets revealed by Li-doping at the Ca-site, which considerably up-shifts the temperature scale (from ∼100 K to ∼250 K) of the dielectric step-anomaly in CLCTO. Competing magneto-electricity and quantum fluctuations result in glassy-arrest of the QP degrees of freedom near T{sub N}; manifest as dispersive-deviation of the permittivity (in SCTO and CLCTO) from the low-temperature Barrett saturation. However, quantum criticality (QC) regime being well above T{sub N} registers its presence nevertheless, as the ∼T{sup 2} behaviour of their inverse dielectric susceptibility. Non-compliance to the usual behaviours of dispersive-response vs. bias-field and temperature unambiguously rule out a relaxor origin of the glassy state. We determine a dimensionless thermal window (0.3 ≤ T/T{sub 1} ≤ 0.6) of QC signature, covering typical quantum-paraelectrics.},

  doi          = {10.1063/1.4926742},

  url          = {https://www.osti.gov/biblio/22490793},
  journal      = {Journal of Applied Physics},

  issn         = {0021-8979},

  number       = 3,

  volume       = 118,

  place        = {United States},

  year         = {Tue Jul 21 00:00:00 EDT 2015},

  month        = {Tue Jul 21 00:00:00 EDT 2015}

}

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