Magnetic phase transition, crystal electric field and zero thermal expansion in ab-plane of thulium carboboride TmB2C

Кузнецов, С. В.; Matovnikov, A. V.; Mitroshenkov, N. V.; Tolstosheev, Andrey; Новиков, В. В.; Bud’ko, Sergey L.

doi:10.1016/j.jmmm.2019.165527

Cited by 3 publications

(4 citation statements)

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“…A characteristic feature of a(T ), b(T ), c(T ) dependences for ErB 2 C is the absence of any noticeable anomalies in the magnetic phase transition region (about 16 K), similar to what we observed for TmB 2 C earlier [14]. The magnetic ordering in the system of magnetic moments of Er 3+ ions, due to the weakness of the bond between erbium ions and the B-C layers, lead only to insignificant anomalies in the temperature dependences of the lattice parameters, which lie within the scatter of the experimental points.…”

Section: X-ray Diffraction Studysupporting

confidence: 86%

“…In the base plane (parameters a, b), a very small negative expansion is observed over the entire temperature range studied. As noted earlier [13,14], the observed anisotropic invar effect in the X-Y plane is a characteristic property of layered structures of borocarbides, and is evidently caused by a very high bond energy in the B-C layers and a weak bond between the layers.…”

Section: X-ray Diffraction Studysupporting

confidence: 65%

“…This anomaly is most clearly manifested in the temperature dependence of the volumetric thermal expansion coefficient β(T )=(dV/ dT)/V, where the β(T ) dependence with increasing temperature reaches a maximum at 100-150 K and then decreases (figure 14). Such a peculiar thermal behavior of the crystal lattice of erbium borocarbide is obviously due to the peculiarities of the crystal structure of borocarbide, as well as the possible influence of the crystal field [14].…”

Section: X-ray Diffraction Studymentioning

confidence: 99%

“…The aim of the study the low-temperature properties of ErB 2 C borocarbide was finding out the magnetic phase transition affects the thermodynamic characteristics of borocarbide. We were also interested in elucidating the laws of changes in the thermodynamic properties and lattice dynamics of borocarbides as a result of replacing a paramagnetic ion of one type (Tm 3+ ) [14] with another (Er 3+ ).…”

Section: Introductionmentioning

confidence: 99%

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Magnetic phase transition and lattice dynamic features in ErB₂C borocarbide

Новиков

Кузнецов

Mitroshenkov

et al. 2021

J. Phys.: Condens. Matter

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A sample of erbium borocarbide ErB2C was synthesized from a stoichiometric mixture of erbium, boron, and pyrographite hydride. Temperature dependent magnetic susceptibility, heat capacity and lattice parameters of borocarbide at 2–300 K were experimentally investigated, the Raman spectrum was determined and analyzed. Sharp anomalies in the heat capacity and magnetic properties of ErB2C near T = 16.3 K, caused by the transition to the antiferromagnetic state, as well as diffuse anomalies at a higher temperature, caused by the effect of the crystal field (Schottky anomalies) were revealed. It was found that the magnetic phase transition does not cause measurable anomalies in the lattice parameters of borocarbide due to the weak coupling between the Er3+ ion subsystem and the B–C layers. Almost zero thermal expansion of erbium borocarbide in the basal plane (along a and b axes) (anisotropic invar effect) as well as an unusual character of the c-axis thermal expansion were observed. The first of these features is due to the high bonding energy in the B–C layers and the weak bond between the layers in the borocarbide crystal lattice. It was found that the anomalous expansion along the c axis is a consequence of the action of the crystal field. The splitting scheme for the ground level of Er3+ ions by crystal field was determined from the analysis of the Schottky anomaly of the heat capacity.

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Section: X-ray Diffraction Studysupporting

confidence: 86%

Section: X-ray Diffraction Studysupporting

confidence: 65%

Section: X-ray Diffraction Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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