Effect of local distortions on magnetic and magnetoelectric properties of paramagnetic Pr3Ga5SiO14 langasite
Description
These are the data to the paper:
A. Tikhanovskii, V. Yu. Ivanov, A. Kuzmenko, E. Constable, A. Pimenov, and A. Mukhin
“Effect of local distortions on magnetic and magnetoelectric properties of paramagnetic Pr3Ga5SiO14 langasite”
Phys. Rev. B 110, 014409 (2024). https://doi.org/10.1103/PhysRevB.110.014409
arXiv:2409.07897
File format: "Origin" (OriginLab Corporation)
The file "Magnetization_Field_Pr_LGS.oggu" contains the magnetic field dependencies of the magnetization of PGS for temperatures from 1.9 to 60 K and for different orientations of the external field. The theory curves correspond to the model as described in the manuscript.
The file "Magnetization_Temperature_Pr_LGS.oggu" contains the Temperature dependencies of the magnetic susceptibility of PGS in an external field oriented parallel and perpendicular to the basal plane. The theory curves correspond to the model as described in the manuscript. Additionally, the Van Vleck contribution and the contributions from excited levels to the susceptibility are given. The inset displays the temperature dependencies of the derivative of the magnetic susceptibility, demonstrating the same contributions from the two lowest singlets for fields along the a and c axes.
The file "Polarization_Pr_LGS.oggu" contains the field dependencies of the electric polarization PGS for different orientations and temperatures. Second, the temperature dependencies of the magnetoelectric susceptibilities obtained from the field dependencies of electric polarization are given. The temperature dependence of the dP/dH, demonstrates the deviation from the standard behavior at low temperatures. Solid lines
are theoretical fits with parameters given in Table I of the main manuscript.
Abstract
Magnetic-field-induced electric polarization has been observed in trigonal noncentrosymmetric paramagnetic Pr3Ga5SiO14 langasite. We detected quadratic electric polarization along the 𝑎 axis in the basal 𝑎𝑏 plane for various magnetic field orientations. Electric polarization along the 𝑐 axis is only evident starting from the fourth power of magnetic field, in accordance with the trigonal symmetry. The magnetic properties of Pr3Ga5SiO14 primarily stem from the local anisotropic magnetic moment of the two lowest Pr3+ singlets (quasidoublet) in the crystal electric field. The random distribution of Ga/Si in the 2𝑑 positions leads to a local distortion of the 𝐶2 symmetry and to a distribution of the quasidoublet splitting. By considering the interactions of local moments among different Pr3+ positions within a phenomenological approach for the allowed magnetoelectric coupling, we derive the electric polarization in terms of symmetry-allowed combinations of local magnetic susceptibilities and field components. The magnetic field dependence of electric polarization in the basal plane, 𝑃𝑎,𝑏*, is mainly determined by the accumulation of effective local susceptibilities, exhibiting similar behavior in low fields, while polarization along the 𝑐 axis, 𝑃𝑐, arises from the nonequivalence of local effective magnetic susceptibilities in different Pr3+ positions. Our findings suggest that the temperature dependencies of magnetic and magnetoelectric susceptibilities are highly sensitive to the distribution of the quasidoublet splitting, which reflects the local symmetry breaking.
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- Dataset: 10.1103/PhysRevB.110.014409 (DOI)