Growth of single-crystalline nickel silicide nanowires with excellent physical properties

Lin, Jen Yi; Hsu, Hsiu Ming; Lu, Kuo Chang

doi:10.1039/c4ce02513j

Cited by 17 publications

(12 citation statements)

References 24 publications

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“…This effect is small for YNiGe 3 but is more pronounced for heavier rare earths as in the case of LuNiGe 3 . There were some small NiSi 2 crystallites attached to the surface of the crystals (a diamagnetic nonsuperconducting metallic silicide [39][40][41]) that could be easily removed by polishing. Besides Sn (T c = 3.7 K), no other superconducting impurity was detected, so we may claim that the superconducting transitions presented below are due to these new intermetallic compounds.…”

Section: Resultsmentioning

confidence: 99%

Superconductivity in monocrystalline YNiSi3 and LuNiSi3

et al. 2019

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We report the discovery of bulk superconductivity in the ternary intermetallics YNiSi 3 and LuNiSi 3. High-quality single crystals were grown via the Sn-flux method and studied using magnetization, specific-heat, and resistivity measurements at low temperatures. The critical temperatures obtained from these different techniques are in very good agreement and yield T c = 1.36(3) K and T c = 1.61(2) K for YNiSi 3 and LuNiSi 3 , respectively. Magnetization measurements indicate that both compounds are among the rare cases where type-I superconductivity occurs in a ternary intermetallic, however, the jump in the specific heat at the transition is lower than the value expected from BCS theory (C el /γ n T c = 1.43) in both materials and is equal to 1.14(9) and 0.71(5) for the Y and Lu compounds, respectively. Resistivity measurements exhibit sharp transitions but with critical fields μ 0 H c (0) (≈0.05 T for YNiSi 3 and ≈0.08 T for LuNiSi 3) considerably higher than those obtained from the magnetization and specific heat (≈0.01 T). First-principles density functional theory calculated electronic structure shows that these compounds have highly anisotropic and complex Fermi surfaces with one electronic and two holelike branches. One hole branch and the electron branch have a large cylindrical topology connecting the first Brillouin-zone boundaries, the former being built up by the hybridization of Y(Lu) d, Ni d, and Si p states, and the latter being built up by Ni d and Si p states. The calculated phononic structures indicate that the coupling of the Y(Lu), Ni d, and Si p electrons in the low-lying optical phonon branches is responsible for the formation of Cooper pairs and the observed superconducting state. Therefore, these compounds can be classified as anisotropic three-dimensional metals with multiband superconducting ground states in the weak-coupling regime.

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Section: Resultsmentioning

confidence: 99%

Superconductivity in monocrystalline YNiSi3 and LuNiSi3

et al. 2019

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“…As the dimension of CMOS devices is down to the nanoscale, metal silicide technology will be even more significant; the substrate of many photonics and microelectronics devices has been silicon. Transition-metal silicides have been studied extensively owing to their outstanding properties, including low resistivity, and great stability [ 1 – 5 ]. For instance, CrSi 2 , β-FeSi 2 , and MnSi are suitable as thermoelectric materials due to their narrow energy gap and great thermostability [ 6 ]; NiSi, CoSi 2 , and TiSi 2 are frequently utilized as materials of the metal gate for decreasing the resistance [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Physical Properties of Single-Crystalline Βeta-FeSi2 Nanowires

Yang

Chen

et al. 2020

Nanoscale Res Lett

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In this study, self-catalyzed β-FeSi2 nanowires, having been wanted but seldom achieved in a furnace, were synthesized via chemical vapor deposition method where the fabrication of β-FeSi2 nanowires occurred on Si (100) substrates through the decomposition of the single-source precursor of anhydrous FeCl3 powders at 750–950 °C. We carefully varied temperatures, duration time, and the flow rates of carrier gases to control and investigate the growth of the nanowires. The morphology of the β-FeSi2 nanowires was observed with scanning electron microscopy (SEM), while the structure of them was analyzed with X-ray diffraction (XRD) and transmission electron microscopy (TEM). The growth mechanism has been proposed and the physical properties of the iron disilicide nanowires were measured as well. In terms of the magnetization of β-FeSi2, nanowires were found to be different from bulk and thin film; additionally, longer β-FeSi2 nanowires possessed better magnetic properties, showing the room-temperature ferromagnetic behavior. Field emission measurements demonstrate that β-FeSi2 nanowires can be applied in field emitters.

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“…Transition metal silicide nanowires have been widely studied [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. Fascinating materials from them with diverse features are recognized to be excellent candidates in various applications, including complementary metal-oxide semiconductor devices [ 10 , 11 ], electronics [ 12 , 13 ], photovoltaics [ 14 , 15 ], spintronics [ 16 , 17 ], field emission [ 18 , 19 , 20 ] and thermoelectrics [ 19 , 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Single Crystalline Higher Manganese Silicide Nanowire Arrays with Outstanding Physical Properties through Double Tube Chemical Vapor Deposition

Shen

Yang

2020

Nanomaterials

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In this work, we report a novel and efficient silicidation method to synthesize higher manganese silicide (HMS) nanowires with interesting characterization and physical properties. High density silicon nanowire arrays fabricated by chemical etching reacted with MnCl2 precursor through a unique double tube chemical vapor deposition (CVD) system, where we could enhance the vapor pressure of the precursor and provide stable Mn vapor with a sealing effect. It is crucial that the method enables the efficient formation of high quality higher manganese silicide nanowires without a change in morphology and aspect ratio during the process. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were utilized to characterize the HMS nanowires. High-resolution TEM studies confirm that the HMS nanowires were single crystalline Mn27Si47 nanowires of Nowotny Chimney Ladder crystal structures. Magnetic property measurements show that the Mn27Si47 nanowire arrays were ferromagnetic at room temperature with a Curie temperature of over 300 K, highly depending on the relationship between the direction of the applied electric field and the axial direction of the standing nanowire arrays. Field emission measurements indicate that the 20 μm long nanowires possessed a field enhancement factor of 3307. The excellent physical properties of the HMS nanowires (NWs) make them attractive choices for applications in spintronic devices and field emitters.

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Growth of single-crystalline nickel silicide nanowires with excellent physical properties

Cited by 17 publications

References 24 publications

Superconductivity in monocrystalline YNiSi3 and LuNiSi3

Superconductivity in monocrystalline YNiSi3 and LuNiSi3

Fabrication and Physical Properties of Single-Crystalline Βeta-FeSi2 Nanowires

Single Crystalline Higher Manganese Silicide Nanowire Arrays with Outstanding Physical Properties through Double Tube Chemical Vapor Deposition

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