Reinvestigation of the Al–Mn–Pd alloy system in the vicinity of the T- and R-phases

Balanetskyy, S.; Meisterernst, Goetz; Heggen, Marc; Feuerbacher, M.

doi:10.1016/j.intermet.2007.08.002

Cited by 47 publications

(57 citation statements)

References 28 publications

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“…Further details on the preparation, characterization, and structural quality of the samples can be found in a recent publication. 15 Our study included seven samples, where for all samples the Al concentration was kept constant at 73 at. %.…”

Section: Sample Selectionmentioning

confidence: 99%

“…%. The first sample was a binary T-Al 3 17 Within the Klein model, 17 the T-Al 3 ͑Mn, Pd͒ phase is described as an independent ternary phase structurally similar to binary T-Al 3 Mn, whereas Balanetskyy et al 15 have reported that this phase is not an independent ternary phase but a ternary solid solution of Pd in the binary T-Al 3 Mn. The structure of the Taylor phase is built of two atomic layers stacked along the b crystallographic axis, a flat layer F, and a puckered layer composed of two sublayers P1 and P2.…”

Section: Sample Selectionmentioning

confidence: 99%

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Broken ergodicity, memory effect, and rejuvenation in Taylor-phase and decagonalAl3(Mn,Pd,Fe)complex intermetallics

et al. 2008

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The Taylor-phase complex intermetallic compound T-Al 3 Mn, its solid solutions with Pd and Fe, T-Al 3 ͑Mn, Pd͒ and T-Al 3 ͑Mn, Fe͒, and the related decagonal d-Al-Mn-Fe quasicrystal belong to the class of magnetically frustrated spin systems that exhibit rich out-of-equilibrium spin dynamics in the nonergodic phase below the spin-freezing temperature T f . Performing large variety of magnetic experiments as a function of temperature, magnetic field, aging time t w , and different thermal histories, we investigated broken-ergodicity phenomena of ͑i͒ a difference in the field-cooled and zero-field-cooled susceptibilities, ͑ii͒ the frequencydependent freezing temperature, T f ͑͒, ͑iii͒ hysteresis and remanence, ͑iv͒ ultraslow decay of the thermoremanent magnetization, ͑v͒ the memory effect ͑a state of the spin system reached upon isothermal aging can be retrieved after a negative temperature cycle͒, and ͑vi͒ "rejuvenation" ͑small positive temperature cycle within the nonergodic phase erases the effect of previous aging͒. We show that the phenomena involving isothermal aging periods ͑the memory effect, rejuvenation, and the ultraslow decay of the thermoremanent magnetization͒ get simple explanation by considering that during aging under steady external conditions, localized spin regions quasiequilibrate into more stable configurations, so that higher thermal energy is needed to destroy these regions by spin flipping, as compared to the thermal energy required to reverse a frustrated spin in a disordered spin-glass configuration that forms in the case of no aging. Common to all the investigated brokenergodicity phenomena is the slow approach of a magnetically frustrated spin system toward a global equilibrium, which can never be reached on accessible experimental time scales due to macroscopic equilibration times.

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Section: Sample Selectionmentioning

confidence: 99%

Section: Sample Selectionmentioning

confidence: 99%

Broken ergodicity, memory effect, and rejuvenation in Taylor-phase and decagonalAl3(Mn,Pd,Fe)complex intermetallics

et al. 2008

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“…The structure of the binary T-Al 3 Mn was first solved by Hiraga et al,10 whereas the model of T-Al 3 ͑Mn, Pd͒ with composition Al 72.3 Mn 24.5 Pd 3.2 was reported by Klein et al 11 Within the Klein model, 11 the T-Al 3 ͑Mn, Pd͒ phase is described as an independent ternary phase structurally similar to binary T-Al 3 Mn, whereas Balanetskyy et al 12 have reported that this phase is not an independent ternary phase, but a ternary solid solution of Pd in the binary T-Al 3 Mn. The same consideration holds for the ternary solid solution T-Al 3 ͑Mn, Fe͒.…”

Section: Structural Considerations and Sample Preparationmentioning

confidence: 99%

Anisotropic physical properties of the Taylor-phaseT-Al72.5Mn21.5Fe6.0com

et al. 2010

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We have investigated anisotropic physical properties ͑the magnetic susceptibility, the electrical resistivity, the thermoelectric power, the Hall coefficient and the thermal conductivity͒ of the single-crystalline Taylorphase T-Al 72.5 Mn 21.5 Fe 6.0 complex intermetallic that is an orthorhombic approximant to the d-Al-Mn-Pd decagonal quasicrystal. The measurements were performed along the a, b, and c directions of the orthorhombic unit cell, where ͑a , c͒ atomic planes are stacked along the perpendicular b direction. The T-Al 72.5 Mn 21.5 Fe 6.0 shows spin-glass behavior below the spin-freezing temperature T f Ϸ 29 K with a small anisotropy in the magnetic susceptibility. The anisotropic electrical resistivities are rather large and show negative temperature coefficient. The resistivity is lowest along the stacking direction, which appears to be a common property of the decagonal-approximant phases with a stacked-layer structure. The temperature-dependent resistivity was theoretically reproduced by the quantum transport theory of slow charge carriers. The thermopower is positive for all three crystallographic directions, indicating that holes are the majority charge carriers, and no anisotropy can be claimed within the experimental precision. The same conclusion on the holes being the dominant charge carriers follows from the Hall-coefficient measurements, which is a sum of the ͑positive͒ normal Hall coefficient and the anomalous term, originating from the magnetization. The anisotropy of the thermal conductivity is practically negligible. The T-Al 72.5 Mn 21.5 Fe 6.0 Taylor phase can be considered as a "close-to-isotropic" complex intermetallic. The relation of the anisotropic physical properties of the Taylor phase to other families of decagonal-approximant phases with the stacked-layer structure is discussed.

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“…2 Among the various approximants, the and Ј phases are situated on the Pd-rich side of the ternary phase diagram while the Taylor's ͑T͒ or Robinson's ͑R͒ orthorhombic phases, which are related to the decagonal state, are found in the Mn-rich region. [3][4][5] For instance, the orthorhombic T-Al 3 Mn crystal 3 with a b unit-cell parameter equal to 12.43 Å parallel to the pseudotenfold axis ͑p-10f͒ is closely related to the decagonal Al-Pd-Mn quasicrystal of similar periodicity along the tenfold axis. 6,7 The structure within the planes perpendicular to the p-10f axis of both T and R phases can be understood as a periodic stacking of two different tilings based on a single tile H with the shape of a squashed hexagon.…”

Section: Introductionmentioning

confidence: 99%

Structure of the (010) surface of the orthorhombic complex metallic alloyT-Al3(Mn,Pd)

et al. 2010

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The atomic and electronic structures of the ͑010͒ surface of the T-Al 3 ͑Mn,Pd͒ complex metallic alloy is investigated by means of low-energy electron diffraction ͑LEED͒, scanning tunneling microscopy ͑STM͒, x-ray and ultraviolet photoelectron spectroscopy ͑XPS and UPS͒, x-ray photoelectron diffraction ͑XPD͒, and ab initio calculations. While structural imperfections are observed at the surface and out of the various possible terminations, the puckered P2 layer is identified as the only surface termination, thus pointing out the existence of a well-defined minimum in the surface energy landscape. The measured step heights correspond to distances between identical planes along the ͓010͔ direction in the bulk model, i.e., b / 2. A bias dependency of the STM topography is found. The XPD and LEED patterns confirm the pseudotenfold symmetry of the sample. XPS and UPS show a more metallic signature of the T phase compared to Al-based quasicrystalline phases.

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Reinvestigation of the Al–Mn–Pd alloy system in the vicinity of the T- and R-phases

Cited by 47 publications

References 28 publications

Broken ergodicity, memory effect, and rejuvenation in Taylor-phase and decagonalAl3(Mn,Pd,Fe)complex intermetallics

Broken ergodicity, memory effect, and rejuvenation in Taylor-phase and decagonalAl3(Mn,Pd,Fe)complex intermetallics

Anisotropic physical properties of the Taylor-phaseT-Al72.5Mn21.5Fe6.0com

Structure of the (010) surface of the orthorhombic complex metallic alloyT-Al3(Mn,Pd)

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