First-principle investigation on electronic structure, magnetism and multiferroicity of BiMn 3 Fe 4 O 12
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Using density-functional calculations we have examined the evolution of the electronic structure of ${\text{SrRuO}}_{3}$ films grown on ${\text{SrTiO}}_{3}$ substrates as a function of film thickness. At the ultrathin limit of two monolayers (${\text{RuO}}_{2}$-terminated surface) the films are found to be at the brink of a spin-state transition which drives the system to an antiferromagnetic and insulating state. Increasing the film thickness to four monolayers, one finds the surprising result that two entirely different solutions coexist. An antiferromagnetic insulating solution coexists with a metallic solution corresponding to an antiferromagnetic surface and a ferromagnetic bulk. The electronic structure found at the ultrathin limit persists for thicker films and an unusual result is predicted. Thicker films are found to be metallic as expected for the bulk but the magnetism does not directly evolve to the bulk ferromagnetic state. The surface remains antiferromagnetic while the bulk exhibits ferromagnetic ordering.
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The iron-based superconductors represent a promising platform for high-temperature superconductivity, but the interactions underpinning their pairing present a puzzle. The EuFe$_2$As$_2$ family is unique among these materials for having magnetic order which onsets within the superconducting state, just below the superconducting transition. Superconductivity and magnetic order are normally antagonistic and often vie for the same unpaired electrons, but in this family the magnetism arises from largely localized Eu moments and they coexist, with the competition between these evenly-matched opponents leading to reentrant superconducting behavior. To help elucidate the physics in this family and the interactions between the magnetic order and superconductivity, we investigate the $H$--$T$ phase diagram near optimal Rh doping through specific heat, resistivity, and magnetization measurements, and study the electronic structure by angular-resolved photoemission spectroscopy. The competition between the Eu and FeAs layers may offer a route to directly accessing the electronic structure under effective magnetic fields via ARPES, which is ordinarily a strictly zero-field technique.
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The advent of high transverse field muon spin rotation (TF-μSR) has led to recent μSR investigations of the magnetic field response of cuprates above the superconducting transition temperature Tc. Here the results of such experiments on hole-doped cuprates are reviewed. Although these investigations are currently ongoing, it is clear that the effects of high field on the internal magnetic field distribution of these materials is dependent upon competition between superconductivity and magnetism. In La2 − xSrxCuO4 the response to the external field above Tc is dominated by heterogeneous spin magnetism. However, the magnetism that dominates the observed inhomogeneous line broadening below x ∼ 0.19 is overwhelmed by the emergence of a completely different kind of magnetism in the heavily overdoped regime. The origin of the magnetism above x ∼ 0.19 is probably related to intrinsic disorder, but the systematic evolution of the magnetism with doping changes in the doping range beyond the superconducting 'dome'. In contrast, the width of the internal field distribution of underdoped Y Ba2Cu3Oy above Tc is observed to track Tc and the density of superconducting carriers. This observation suggests that the magnetic response above Tc is not dominated by electronic moments, but rather inhomogeneous fluctuating superconductivity. The spatially inhomogeneous response of Y Ba2Cu3Oy to the applied field may be a means of minimizing energy, rather than being caused by intrinsic disorder.
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We report the study of superconductivity and magnetism in ${\mathrm{Sc}}_{5\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Dy}}_{\mathit{x}}$${\mathrm{Ir}}_{4}$${\mathrm{Si}}_{10}$ (x=0,0.5, 1,1.5,2,3,4,4.5,5) alloys. We find that the superconducting transition temperature decreases as x increases and a linear increase of antiferromagnetic ordering temperature from x=2 to 5. We also report an observation of the coexistence of superconductivity and magnetism for x=1.5 from resistivity and ac susceptibility measurements in small applied dc magnetic fields.
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We report calculations of the electronic structure and magnetic properties of YFe${}_{2}$Ge${}_{2}$ and discuss the results in terms of the observed superconductivity near magnetism. We find that YFe${}_{2}$Ge${}_{2}$ is a material near a magnetic quantum critical point based on comparison of standard density functional results that predict magnetism with experiment. The band structure and Fermi surfaces are very three dimensional and higher conductivity is predicted in the $c$-axis direction. The magnetism is of Stoner type and is predominately from an in-plane ferromagnetic tendency. The interlayer coupling is weak giving a perhaps two dimensional character to the magnetism, which is in contrast to the conductivity and may be important for suppressing the ordering tendency. This is compatible with a triplet superconducting state mediated by spin fluctuations.
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