Poojitha Bommareddy, Shaji Aswin, Badola Shalini, Saha Surajit
Department of Physics, Indian Institute of Science Education and Research, Bhopal 462066, India.
J Chem Phys. 2022 May 14;156(18):184701. doi: 10.1063/5.0087770.
Coupling of material properties provides new fundamental insights and possibilities toward multifunctional devices. The spinel structures display strong coupling between different order parameters, as a consequence, exhibiting many fascinating properties, such as multiferroicity and superconductivity. Here, we have investigated the structural, magnetic, and vibrational properties of mixed-spinel CoMnO stabilized in distorted tetragonal structures as evidenced from x-ray diffraction measurements. Magnetization measurements reveal two ferrimagnetic phase transitions at 185 and 90 K. Raman scattering measurements reveal the renormalization of phonon parameters for a few phonon modes at low temperatures, arising from spin-phonon coupling. The obtained value for λS is ∼2 cm. The strength of spin-phonon coupling (λ) is estimated according to the spins involved in the corresponding lattice vibrations and discussed.
材料特性的耦合为多功能器件提供了新的基本见解和可能性。尖晶石结构在不同的序参量之间表现出强耦合，因此展现出许多迷人的特性，如多铁性和超导性。在这里，我们研究了稳定在畸变四方结构中的混合尖晶石CoMnO的结构、磁性和振动特性，X射线衍射测量证明了这一点。磁化测量揭示了在185 K和90 K处的两个亚铁磁相变。拉曼散射测量揭示了低温下一些声子模式的声子参数重整化，这是由自旋-声子耦合引起的。得到的λS值约为2 cm。根据相应晶格振动中涉及的自旋估计了自旋-声子耦合强度(λ)并进行了讨论。
