Superconductivity in a new T2-phase Mo5GeB2

Ruan, Bin-Bin; Yang, Qingsong; Zhou, Mengzi; Chen, Genfu; Ren, Zhi-An

doi:10.1016/j.jallcom.2021.159230

Cited by 8 publications

(9 citation statements)

References 33 publications

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“…The chemical compositions were determined by an energy-dispersive X-ray (EDX) spectrometer equipped on a Phenom ProX scanning electron microscope. More details about the measurements can be found in our previous study [26].…”

Section: Methodsmentioning

confidence: 99%

Strong-coupling superconductivity with Tc ∼ 10.8 K induced by P doping in the topological semimetal Mo5Si3

et al. 2022

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By performing P doping on the Si sites in the topological semimetal Mo 5 Si 3 , we discover strong-coupling superconductivity in Mo 5 Si 3−x P x (0.5 ≤ x ≤ 2.0). Mo 5 Si 3 crystallizes in the W 5 Si 3 -type structure with space group of I4/mcm (No. 140), and is not a superconductor itself. Upon P doping, the lattice parameter a decreases while c increases monotonously. Bulk superconductivity is revealed in Mo 5 Si 3−x P x (0.5 ≤ x ≤ 2.0) from resistivity, magnetization, and heat capacity measurements. T c in Mo 5 Si 1.5 P 1.5 reaches as high as 10.8 K, setting a new record among the W 5 Si 3 -type superconductors. The upper and lower critical fields for Mo 5 Si 1.5 P 1.5 are 14.56 T and 105 mT, respectively. Moreover, Mo 5 Si 1.5 P 1.5 is found to be a fully gapped superconductor with strong electron-phonon coupling. First-principles calculations suggest that the enhancement of electron-phonon coupling is possibly due to the shift of the Fermi level, which is induced by electron doping. The calculations also reveal the nontrivial band topology in Mo 5 Si 3 . The T c and upper critical field in Mo 5 Si 3−x P x are fairly high among pseudobinary compounds. Both of them are higher than those in NbTi, making future applications promising. Our results suggest that the W 5 Si 3 -type compounds are ideal platforms to search for new superconductors. By examinations of their band topologies, more candidates for topological superconductors can be expected in this structural family.

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Section: Methodsmentioning

confidence: 99%

Strong-coupling superconductivity with Tc ∼ 10.8 K induced by P doping in the topological semimetal Mo5Si3

et al. 2022

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Section: Introductionmentioning

confidence: 99%

“…In 1957, the first two members of the T2 phases, Mo 5 SiB 2 and W 5 SiB 2 , were reported by Nowotny et al followed by the discovery of Fe 5 SiB 2 and Mn 5 SiB 2 in 1960 . More recently, interest in T2 phases has been reignited for their chemical variety, where the M element can be Mo, Mn, Fe, Cr, W, Ta, Co, and Nb, while the A element can be Si, S, P, and Ge. ,− This has enabled them to possess various attractive properties such as high oxidation resistance, near isotropic thermal expansion, and excellent elastic properties in addition to magnetic and superconductive properties …”

Section: Introductionmentioning

confidence: 99%

“…9, 13−19 This has enabled them to possess various attractive properties such as high oxidation resistance, 20 near isotropic thermal expansion, 21 and excellent elastic properties 22 in addition to magnetic 14 and superconductive properties. 19 To expand the chemistry of the MAB phase family and include more transition metals, several attempts have been made to synthesize quaternary MAB with two M elements as solid solutions. Hirt et al 23 studied the effect of Co substitution on the magnetic properties of Fe 2 AlB 2 .…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Theoretical Investigations of Out-of-Plane Ordered Nanolaminate Transition Metal Borides: M₄CrSiB₂ (M = Mo, W, Nb)

et al. 2023

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We report the synthesis of three out-of-plane chemically ordered quaternary transition metal borides (o-MAB phases) of the chemical formula M 4 CrSiB 2 (M = Mo, W, Nb). The addition of these phases to the recently discovered o-MAB phase Ti 4 MoSiB 2 shows that this is indeed a new family of chemically ordered atomic laminates. Furthermore, our results expand the attainable chemistry of the traditional M 5 SiB 2 MAB phases to also include Cr. The crystal structure and chemical ordering of the produced materials were investigated using high-resolution scanning transmission electron microscopy and X-ray diffraction by applying Rietveld refinement. Additionally, calculations based on density functional theory were performed to investigate the Cr preference for occupying the minority 4c Wyckoff site, thereby inducing chemical order.

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“…The MAB phases are chemically diverse and can exist in a variety of crystal structures, involving orthorhombic M n +1 AB 2 n ( n = 1–3), hexagonal M 2 AB 2 , monoclinic M n +1 AB n ( n = 1, 2), , and the tetragonal M 5 AB 2 (also known as T2 phases) . So far, a variety of T2 phases have been prepared, including Mo 5 SiB 2 , W 5 SiB 2 , Fe 5 SiB 2 , and Mn 5 SiB 2 , possessing unique chemical (e.g., high oxidation stability) and physical (good elasticity and superconductivity) properties.…”

Section: Introductionmentioning

confidence: 99%

Computationally Driven Discovery of Quaternary Tantalum-Based MAB-Phases: Ta₄M″SiB₂ (M″ = V, Cr, or Mo): Synthesis, Characterization, and Elastic Properties

Etman

Halim

Lind

et al. 2023

Crystal Growth & Design

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We report on the synthesis of computationally predicted out-of-plane chemically ordered transition metal borides labeled o-MAB phases, Ta4M″SiB2 (M″ = V, Cr), and a structurally equivalent disordered solid solution MAB phase Ta4MoSiB2. The boride phases were prepared using solid-state reaction sintering of the constituting elements. High-resolution scanning transmission electron microscopy along with Rietveld refinement of the powder-X-ray diffraction patterns revealed that the synthesized o-MAB phases Ta4CrSiB2 (98 wt % purity) and Ta4VSiB2 (81 wt % purity) possess chemical ordering with Ta preferentially residing in the 16l position and Cr and V in the 4c position, whereas Ta4MoSiB2 (46 wt % purity) was concluded to form a disordered solid solution. Density functional theory (DFT) calculations were used to investigate the dynamic stability, elastic properties, and electronic density states for the MAB phases, confirming the stability and suggesting the borides based on Cr and Mo to be stiffer than those based on V and Nb.

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Superconductivity in a new T2-phase Mo5GeB2

Cited by 8 publications

References 33 publications

Strong-coupling superconductivity with Tc ∼ 10.8 K induced by P doping in the topological semimetal Mo5Si3

Strong-coupling superconductivity with Tc ∼ 10.8 K induced by P doping in the topological semimetal Mo5Si3

Experimental and Theoretical Investigations of Out-of-Plane Ordered Nanolaminate Transition Metal Borides: M₄CrSiB₂ (M = Mo, W, Nb)

Computationally Driven Discovery of Quaternary Tantalum-Based MAB-Phases: Ta₄M″SiB₂ (M″ = V, Cr, or Mo): Synthesis, Characterization, and Elastic Properties

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Superconductivity in a new T2-phase Mo5GeB2

Cited by 8 publications

References 33 publications

Strong-coupling superconductivity with Tc ∼ 10.8 K induced by P doping in the topological semimetal Mo5Si3

Strong-coupling superconductivity with Tc ∼ 10.8 K induced by P doping in the topological semimetal Mo5Si3

Experimental and Theoretical Investigations of Out-of-Plane Ordered Nanolaminate Transition Metal Borides: M4CrSiB2 (M = Mo, W, Nb)

Computationally Driven Discovery of Quaternary Tantalum-Based MAB-Phases: Ta4M″SiB2 (M″ = V, Cr, or Mo): Synthesis, Characterization, and Elastic Properties

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Experimental and Theoretical Investigations of Out-of-Plane Ordered Nanolaminate Transition Metal Borides: M₄CrSiB₂ (M = Mo, W, Nb)

Computationally Driven Discovery of Quaternary Tantalum-Based MAB-Phases: Ta₄M″SiB₂ (M″ = V, Cr, or Mo): Synthesis, Characterization, and Elastic Properties