Ultra-high vacuum compatible induction-heated rod casting furnace

Bauer, Andreas; Neubauer, Andreas; Münzer, W.; Regnat, Alexander; Benka, Georg; Meven, Martin; Pedersen, Bjørn; Pfleiderer, C.

doi:10.1063/1.4954926

Cited by 20 publications

(21 citation statements)

References 27 publications

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“…For our study, single crystals of MnSi were grown by means of optical float-zoning under ultra-high vacuum compatible conditions [43][44][45]. The residual resistivity ratio of samples from these crystals is around 80, i.e., a typical value reported in the literature.…”

Section: Experimental Methodsmentioning

confidence: 99%

Symmetry breaking, slow relaxation dynamics, and topological defects at the field-induced helix reorientation in MnSi

et al. 2017

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We report a study of the reorientation of the helimagnetic order in the archetypal cubic chiral magnet MnSi as a function of magnetic field direction. The reorientation process as inferred from small-angle neutron scattering, the magnetization, and the ac susceptibility is in excellent agreement with an effective mean-field theory taking into account the precise symmetries of the crystallographic space group. Depending on the field and temperature history and the direction of the field with respect to the crystalline axes, the helix reorientation may exhibit a crossover, a first-order, or a second-order transition. The magnetization and ac susceptibility provide evidence that the reorientation of helimagnetic domains is associated with large relaxation times exceeding seconds. At the second-order transitions residual Ising symmetries are spontaneously broken at continuous elastic instabilities of the helimagnetic order. In addition, on the time scales explored in our experiments these transitions are hysteretic as a function of field suggesting, within the same theoretical framework, the formation of an abundance of plastic deformations of the helical spin order. These deformations comprise topologically non-trivial disclinations, promising novel routes to spintronics applications alongside skyrmions discovered recently in the same class of materials.

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Section: Experimental Methodsmentioning

confidence: 99%

Symmetry breaking, slow relaxation dynamics, and topological defects at the field-induced helix reorientation in MnSi

et al. 2017

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“…Ce and Al were weighted in an argon glove box system. First CeAl 2 was prepared in an induction heated horizontal copper cold boat system that can be loaded by means of a bespoke load-lock from a glove box [7]. This reduces contamination of the Ce with oxygen, as the educt CeAl 2 is stable on air.…”

Section: Experimental Methodsmentioning

confidence: 99%

Single crystal growth of CeTAl3 (T = Cu, Ag, Au, Pd and Pt)

Senyshyn

Regnat

Duvinage

et al. 2016

Journal of Alloys and Compounds

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We report single crystal growth of the series of CeT Al 3 compounds with T = Cu, Ag, Au, Pd and Pt by means of optical float zoning. High crystalline quality was confirmed in a thorough characterization process. With the exception of CeAgAl 3 , all compounds crystallize in the non-centrosymmetric tetragonal BaNiSn 3 structure (space group: I4mm, No. 107), whereas CeAgAl 3 adopts the related orthorhombic PbSbO 2 Cl structure (Cmcm, No. 63). An attempt to grow CeNiAl 3 resulted in the composition CeNi 2 Al 5 . Low temperature resistivity measurements down to ∼0.1 K did not reveal evidence suggestive of magnetic order in CePtAl 3 and CePdAl 3 . In contrast, CeAuAl 3 , CeCuAl 3 and CeAgAl 3 display signatures of magnetic transitions at 1.3 K, 2.1 K and 3.2 K, respectively. This is consistent with previous reports of antiferromagnetic order in CeAuAl 3 , and CeCuAl 3 as well as ferromagnetism in CeAgAl 3 , respectively.

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“…62 The polycrystalline feed rods were cast from pure starting elements (4N Fe, 3N5 Co, 6N Si) using a bespoke Hukin crucible with radio-frequency heating inside an all-metal sealed furnace. 63 The details of the crystal growth process were identical to the growth of Mn 1−x Fe x Si and Mn 1−x Co x Si as described in Ref. 64.…”

Section: Experimental Methodsmentioning

confidence: 99%

History dependence of the magnetic properties of single-crystalFe1−xCoxSi

2016

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We report the magnetization, ac susceptibility, and specific heat of optically float-zoned single crystals of Fe1−xCoxSi, 0.20 ≤ x ≤ 0.50. We determine the magnetic phase diagrams for all major crystallographic directions and cooling histories. After zero-field cooling, the phase diagrams resemble that of the archetypal stoichiometric cubic chiral magnet MnSi. Besides the helical and conical state, we observe a pocket of skyrmion lattice phase just below the helimagnetic ordering temperature. At the phase boundaries between these states evidence for slow dynamics is observed. When the sample is cooled in small magnetic fields, the phase pocket of skyrmion lattice may persist metastably down to lowest temperatures. Taken together with the large variation of the transition temperatures, transition fields, and the helix wavelength as a function of composition, this hysteresis identifies Fe1−xCoxSi as an ideal material for future experiments exploring, for instance, the topological unwinding of the skyrmion lattice.

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Ultra-high vacuum compatible induction-heated rod casting furnace

Cited by 20 publications

References 27 publications

Symmetry breaking, slow relaxation dynamics, and topological defects at the field-induced helix reorientation in MnSi

Symmetry breaking, slow relaxation dynamics, and topological defects at the field-induced helix reorientation in MnSi

Single crystal growth of CeTAl3 (T = Cu, Ag, Au, Pd and Pt)

History dependence of the magnetic properties of single-crystalFe1−xCoxSi

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