Valence states and metamagnetic phase transition in partiallyB Eu Mn 0.5 Co 0.5
A. N. VasilievО. С. ВолковаЛ. С. ЛобановскийI. O. TroyanchukZhiwei HuL. H. TjengD. I. KhomskiǐH. J. LinC. T. ChenN. TristanFlorian KretzschmarR. KlingelerB. Büchner
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The valence states of transition metals were studied by measuring the x-ray absorption spectra at both $\mathrm{Mn}\phantom{\rule{0.2em}{0ex}}{L}_{2,3}$ and $\mathrm{Co}\phantom{\rule{0.2em}{0ex}}{L}_{2,3}$ edges of partially $B$-site-disordered perovskite $\mathrm{Eu}{\mathrm{Mn}}_{0.5}{\mathrm{Co}}_{0.5}{\mathrm{O}}_{3}$. By comparison with analogous spectra in various Co- and Mn-based compounds, the divalent state of the Co ions and the tetravalent state of the Mn ions were established analogous to ${\mathrm{Mn}}^{4+}∕{\mathrm{Co}}^{2+}$ charge ordering found by Dass and Goodenough [Phys. Rev. B 67, 014401 (2003)] in $\mathrm{La}{\mathrm{Mn}}_{0.5}{\mathrm{Co}}_{0.5}{\mathrm{O}}_{3}$. The specific heat and magnetic susceptibility data indicate the formation of the magnetically ordered state at ${T}_{C}\ensuremath{\sim}120\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The first-order metamagnetic transitions seen in $\mathrm{Eu}{\mathrm{Mn}}_{0.5}{\mathrm{Co}}_{0.5}{\mathrm{O}}_{3}$ at $T<{T}_{C}$ suggest the existence of antiferromagnetic and/or paramagnetic clusters embedded into the ferromagnetic matrix.A balancing act between antiferromagnetism and ferromagnetism, as shown in the cover artwork, occurs in A2MRu5B2 (A=Zr/Hf; M=Fe/Mn) as a result of highly field-dependent magnetic interactions between ferromagnetic Fe/Mn chains. DFT calculations predict antiferromagnetism (AFM) in the Fe-based phases but competing ferromagnetism (FM) and antiferromagnetism in Mn-based ones. Experiments subsequently found a strong field-dependence of the magnetic transitions in all compounds. More information can be found in the Full Paper by B. P. T. Fokwa, et al. on page 1979.
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This chapter contains sections titled: Introduction Frustrations on the Ferromagnet–Antiferromagnet Interface Mathematical Model The Interface between Thick Ferromagnet–Antiferromagnet Layers A Thin Ferromagnetic (Antiferromagnetic) Layer on a Thick Antiferromagnetic (Ferromagnetic) Substrate Spin-Valve Ferromagnet–Antiferromagnet–Ferromagnet System Conclusion References
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We have prepared single crystals of Pr1-xRxB4 (R = La, Ce and Gd) and measured the magnetic susceptibility and specific heat in order to elucidate the origin of the ferromagnetic interaction in PrB4 and the competition of the ferro- and antiferromagnetic interactions in this system. The ferromagnetic transition temperature decreases with x at nearly the same rate in Pr1–xLaxB4 and Pr1–xGdxB4, suggesting that the magnetic moments of Gd do not affect the ferromagnetic order. In Pr0.82Gd0.18B4 and Pr0.8Gd0.2B4, ferromagnetic to antiferromagnetic transitions appear with decreasing temperature. The development of antiferromagnetic correlation between Pr and Gd breaks the ferromagnetic order and induces antiferromagnetic correlation among Pr atoms. These results indicate that two types of magnetic interactions with different origin are present in PrB4.
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At ambient pressure, both the intralayer and the interlayer exchange interactions in the layered compound (CH 3 NH 3 ) 2 CuCl 4 are ferromagnetic. Magnetic susceptibility and neutron scattering experiments performed under pressures up to about 1 GPa revealed that the interlayer exchange interaction turns into an antiferromagnetic one at a pressure between 0.41 GPa and 0.61 GPa, while the intralayer exchange interaction remains ferromagnetic. The spin structure in the antiferromagnetic phase is still collinear at least up to 1.1 GPa.
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Abstract We present evidences that defects in the spin S = 1/2 Heisenberg antiferromagnetic chain (HAFC) compound can lead to ferromagnetism by studying the magnetic and thermal properties of the newly discovered quasi-one-dimensional (1D) metal–organic framework [CH 3 NH 3 ][Cu(HCOO) 3 ] (MACuF). Our findings suggest that the long-range ferromagnetic order at 3.7 K can be attributed to Cu 2+ ions from the 2D networks constructed by the endpoints of the broken chains. In such a case, the intrinsic magnetism can emerge in this quasi-1D Heisenberg chain system at the background of the short-range antiferromagnetism. This unusual ferromagnetism found in HAFC not only enriches magnetic features in the low-dimensional systems, but helps to understand some of the exotic magnetic phenomena in other real quasi-1D magnetic materials.
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