Phonon anomalies and possible local lattice distortions in giant magnetocapacitive CdCr2S4

Gnezdilov Vladimir; Lemmens Peter; Pashkevich Yurii; Payen Christophe; Choi Kwang Yong; Hemberger Joachim; Loidl Alois; Tsurkan Vladimir

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GNEZDILOV, Vladimir, LEMMENS, Peter, PASHKEVICH, Yurii, PAYEN, Christophe, CHOI, Kwang Yong, HEMBERGER, Joachim, LOIDL, Alois, TSURKAN, Vladimir. Phonon anomalies and possible local lattice distortions in giant magnetocapacitive CdCr2S4. In: Physical Review B - Condensed Matter and Materials Physics, 2011, vol. 84, p. 0. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.84.045106

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Physical Review B - Condensed Matter and Materials Physics

Volumul 84 / 2011 / ISSN 1098-0121 /ISSNe 1550-235X

Phonon anomalies and possible local lattice distortions in giant magnetocapacitive CdCr₂S₄

DOI:https://doi.org/10.1103/PhysRevB.84.045106

Pag. 0-0

Gnezdilov Vladimir¹, Lemmens Peter², Pashkevich Yurii³, Payen Christophe⁴, Choi Kwang Yong⁵, Hemberger Joachim⁶, Loidl Alois⁶, Tsurkan Vladimir⁶⁷

¹ B.Verkin Institute for Low Temperature Physics and Engineering of NAS of Ukraine,
² Technical University of Braunschweig,
³ Dоnetsk Institute of Physics and Technology named after A. A. Galkin of the NASU,
⁴ Université de Nantes,
⁵ Chung-Ang University,
⁶ Center for Electronic Correlations and Magnetism, University of Augsburg,
⁷ Institute of Applied Physics, Academy of Sciences of Moldova

Disponibil în IBN: 29 iunie 2023

Rezumat

We investigate the origin of large magnetocapacitive effects in CdCr ₂S₄ single crystals focusing on phonon anomalies in the fluctuation regime T < T* = 130 K and with the onset of ferromagnetic order T_c = 84.4 K. The observation of longitudinal optical and formerly infrared active modes for T < T_c is used to propose a loss of inversion symmetry and Cr off-centering. Further anomalies in intensity, frequency, and linewidth have an onset temperature T* that coincides with the onset of magnetocapacitive effects. The respective intensity anomalies are attributed in part to an enhanced electronic polarizability of displacements that modulate the Cr-S distance and respective hybridization. This is taken as a prerequisite to the proposed Cr off-centering. Anomalies due to the previously disregarded photodoping and resonance are analyzed comparing different excitation energies.

Cuvinte-cheie
magnetism, Curie Temperature, Antiferromagnet

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