Magnetic field induced transitions in Mn5Si3

Al-Kanani, H.J.; Booth, J. G.

doi:10.1016/0304-8853(94)01157-5

Cited by 27 publications

(24 citation statements)

References 1 publication

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“…The main peak at E B =47 eV can not be fit by a single asymmetric Lorentzian but still be deconvoluted into two components of Mn (1) and Mn(2) with small and large intensities separated by the binding energy of 0.98 eV (see Table 1). The asymmetry α of Mn(1) component is higher than that of Mn (2). The intensity ratio of them is again roughly estimated as 2:3.…”

Section: Resultsmentioning

confidence: 80%

Bulk-sensitive photoemission of Mn5Si3

Irizawa

Yamasaki

Okazaki

et al. 2002

Solid State Communications

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We have carried out a bulk-sensitive high-resolution photoemission experiment on Mn 5 Si 3 . The measurements are performed for both core level and valence band states. The Mn core level spectra are deconvoluted into two components corresponding to different crystallographic sites. The asymmetry of each component is of noticeable magnitude. In contrast, the Si 2p spectrum shows a simple Lorentzian shape with low asymmetry. The peaks of the valence band spectrum correspond well to the peak positions predicted by the former band calculation.

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Section: Resultsmentioning

confidence: 80%

Bulk-sensitive photoemission of Mn5Si3

Irizawa

Yamasaki

Okazaki

et al. 2002

Solid State Communications

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“…• C. Neither the polycrystalline nature of the samples nor tiny contributions from the second phase of Mn 5 Si 3 , for which antiferromagnetic order is very sensitive to magnetic field [2], alter the key observations and conclusions reported here.…”

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confidence: 65%

Stability of antiferromagnetism at high magnetic fields inMn3Si

2002

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We report low temperature measurements of the specific heat, resistivity and magnetisation of the itinerant antiferromagnet Mn3Si. The unprecedented stability of the magnetic state to high magnetic field up to 14 T inferred from the invariance of these bulk properties is incompatible with itinerant magnetism expected of a conventional Fermi liquid.PACS numbers: 71.45. Lr, 75.50Ee, 75.40.Cx, 75.30.Fr Weakly magnetic transition metal compounds with small ordered moments and low transition temperatures are usually well described as a Fermi liquid with weakly exchange split Fermi surface, where special topological features of the Fermi surface are ignored [1]. It is in contrast still an open issue if magnetic metals with large ordered moments and small ordering temperature, that are more akin to local moment insulators, may also be described on the basis of Fermi liquid theory. Insight into this question may be sought in the dominant energy scales controling the magnetic ordering temperature T N of an itinerant antiferromagnet. In a Fermi liquid low ordering temperatures result from strong coupling of the magnetisation at ordering wave-vector Q with heavily damped spin fluctuations [1]. On the other hand, in the isotropic Heisenberg model low ordering temperatures result from weak exchange coupling of localized magnetic moments. The energy scale and nature of the magnetic ordering compared to the mode-mode or local moment coupling, respectively, are hence fundamental to magnetism in solids.The polarization of a magnetic state in a magnetic field allows to probe the relevant coupling strengths. In fact, a very large number of transition metal compounds are known in which ordering temperatures of order 20 K are related to a high sensitivity to magnetic field of a few T regardless of whether they are better described in terms of Fermi liquid theory or the Heisenberg model [2][3][4]. In this paper we report an experimental investigation in which we employ the effect of high magnetic field (µ B H ≈ k B T N ) on the bulk magnetisation M , specific heat C and electrical resistivity ρ of a cubic metallic antiferromagnet, Mn 3 Si, to study the strength of the coupling of the uniform mode (q = 0) with the ordering wave-vector Q. The observed complete absence of a field dependence is surprising, because it either suggests an isotropic Fermi liquid in which the mode-mode coupling is absent or an isotropic Heisenberg magnet in which the moment coupling is exceptionally strong, despite low T N . From either point of view the conceptual simplicity of Mn 3 Si challenges the present day understanding of metallic antiferromagnetism.Recent years have witnessed an increased interest in the magnetic and metallic properties of Heusler transition metal compounds [5-8] to which Mn 3 Si belongs. Ternary members of this class of materials display a wide variety of different behaviours such as disorder induced non-Fermi liquid [7,8], half-metallic magnetic [6] and semiconducting ground states [5]. High ferromagnetic ordering temperatures o...

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“…The XRD analysis suggests that, although some peaks are unidentified, the major magnetic phases in the MBE-grown Si 1Àx Mn x semiconductors be the SiMn ferromagnetic phase and the Si 3 Mn 5 anti-ferromagnetic phase. The Curie temperature of SiMn phase is known to be B30 K and Neel temperature of the Si 3 Mn 5 phase is known to be B95 K [15][16][17]. The second ferromagnetic phase suggested by the dualphase nature in Fig.…”

Section: Resultsmentioning

confidence: 96%