Magnetic properties of Pb2Fe2Ge2O9 single crystals

Petrakovskiı̌, G. A.; Popov, M. A.; Balaev, A. D.; Sablina, K. A.; Bayukov, O. A.; Великанов, Д. А.; Воротынов, А. М.; Bovina, A. F.; Vasil’ev, A. D.; Boehm, Martin

doi:10.1134/s1063783409090145

Cited by 10 publications

(13 citation statements)

References 5 publications

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“…on the carefully oriented type-B single crystals and confirmed our assumption. In particular, we found that, in contrast to the data from [15], the weak ferromagnetic moment is directed along the a, rather than b, axis. Figure 1 shows the temperature dependence of the magnetization measured along the a axis in a magnetic field of 1 kOe.…”

Section: Resultscontrasting

confidence: 91%

“…The single crystals of both types were mechanically withdrawn from a crucible, without using nitric acid solutions. X-ray diffraction analysis showed that the crystals of both types have the identical crystal structure parameters consistent with the parameters reported in [15].…”

Section: Methodssupporting

confidence: 80%

“…The magnetic properties of the type-A Pb2Fe2Ge2O9 single crystals were thoroughly investigated in [15]. Recently, we have reanalyzed the data obtained and assumed that, during the magnetization measurements, the a and b axes were confused 1 .…”

Section: Resultsmentioning

confidence: 99%

“…To avoid foreign contaminations that could come from a flux material, only classical solvents contained in the chemical composition of the synthesized crystal were used. Single crystals of two types were investigated: type-A single crystals were grown using the procedure described in [15] and type-B single crystals were also grown in the PbO-Ge2O3 solvent, but with a higher eutectic point (768 0 C). The ratio between the basic composition and the solvent was 1: 2.…”

Section: Methodsmentioning

confidence: 99%

“…Petrakovskii et al synthesized first orthorhombic Pb2Fe2Ge2O9 antiferromagnetic single crystals with a weak ferromagnetic moment [15]. This compound contains the stereochemical Pb 2+ ion and therefore is interesting for studying the magnetodielectric properties.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and thermodynamic properties and spin-flop-driven magnetodielectric response of the antiferromagnetic Pb2Fe2Ge2O9 single crystals

Pankrats

Balaev

Nikitin

et al. 2019

Journal of Magnetism and Magnetic Materials

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Orthorhombic Pb2Fe2Ge2O9 antiferromagnetic single crystals have been synthesized by a modified pseudo-flux technique and their magnetic, thermodynamic, and magnetodielectric properties have been investigated. It has been found that, below the Neel temperature (45.2 K), iron moments are arranged in a canted antiferromagnetic structure with a weak ferromagnetic moment parallel to the a axis. According to the specific heat measurement data, the TN value remains invariable in applied magnetic fields of up to 5 T within the experimental accuracy. The magnetic entropy in the investigated crystals attains 2Rln(2S+1) right above TN, which is indicative of a purely magnetic nature of the transition. It has been shown that the weak ferromagnetic moment is induced by the interplay between the single-ion anisotropy and antisymmetric Dzyaloshinskii-Moriya exchange interaction, with the latter contribution being dominant. It has been established from the angular dependences of the magnetization in three orthorhombic planes that the symmetries of the magnetic and crystal structure are identical. The magnetodielectric properties of the Pb2Fe2Ge2O9 single crystals have been studied at different mutual orientations of the electric and magnetic fields. The most prominent anomalies have been observed in the vicinity of the spin-flop transition in a magnetic field applied along the c axis.

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Section: Resultscontrasting

confidence: 91%

Section: Methodssupporting

confidence: 80%