Elastic and anelastic relaxations associated with phase transitions in EuTiO3

Leszek J. Spalek, Siddharth S. Saxena, Christos Panagopoulos, Takuro Katsufuji, Jason A. Schiemer, Michael A. Carpenter

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    Elastic and anelastic properties of single crystal samples of EuTiO3 have been measured between 10 and 300 K by resonant ultrasound spectroscopy at frequencies in the vicinity of 1 MHz. Softening of the shear elastic constants C44 and 12(C11-C12) by ∼20-30% occurs with falling temperature in a narrow interval through the transition point, Tc=284 K, for the cubic-tetragonal transition. This is accounted for by classical coupling of macroscopic spontaneous strains with the tilt order parameter in the same manner as occurs in SrTiO3. A peak in the acoustic loss occurs a few degrees below Tc and is interpreted in terms of initially mobile ferroelastic twin walls, which rapidly become pinned with further lowering of temperature. This contrasts with the properties of twin walls in SrTiO3, which remain mobile down to at least 15 K. No further anomalies were observed that might be indicative of strain coupling to any additional phase transitions above 10 K. A slight anomaly in the shear elastic constants, independent of frequency and without any associated acoustic loss, was found at ∼140 K. It marks a change from elastic stiffening to softening with falling temperature and perhaps provides evidence for coupling between strain and local fluctuations of dipoles related to the incipient ferroelectric transition. An increase in acoustic loss below ∼80 K is attributed to the development of dynamical magnetic clustering ahead of the known antiferromagnetic ordering transition at ∼5.5 K. Detection of these elastic anomalies serves to emphasize that coupling of strain with tilting, ferroelectric, and magnetic order parameters is likely to be a permeating influence in determining the structure, stability, properties, and behavior of EuTiO3.

    Original languageEnglish
    Article number054119
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume90
    Issue number5
    DOIs
    Publication statusPublished - 2014 Aug 29

    Fingerprint

    Anelastic relaxation
    Phase transitions
    elastic properties
    Acoustics
    Elastic constants
    anomalies
    falling
    softening
    Ferroelectric materials
    acoustics
    permeating
    shear
    stiffening
    transition points
    Temperature
    temperature
    Ultrasonics
    Single crystals
    Spectroscopy
    dipoles

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Elastic and anelastic relaxations associated with phase transitions in EuTiO3. / Spalek, Leszek J.; Saxena, Siddharth S.; Panagopoulos, Christos; Katsufuji, Takuro; Schiemer, Jason A.; Carpenter, Michael A.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 5, 054119, 29.08.2014.

    Research output: Contribution to journalArticle

    Spalek, Leszek J. ; Saxena, Siddharth S. ; Panagopoulos, Christos ; Katsufuji, Takuro ; Schiemer, Jason A. ; Carpenter, Michael A. / Elastic and anelastic relaxations associated with phase transitions in EuTiO3. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 90, No. 5.
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