Effect of structure on the superconductivity of CaAlSi and SrAlSi: Density functional calculations

Huang, G. Q.; Wang, W.; Shu, Huabing; Liu, S.; Liu, M.

doi:10.1016/j.physc.2008.07.001

Cited by 6 publications

(6 citation statements)

References 29 publications

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“…8 shows the phonon dispersion for the three phases considered in this section. The phonon dispersion for the AlSiSr phase has been previously studied by other groups [45,46,54,55]. Our results are in good qualitative agreement with the reported calculations by Huang et al [54,55], with the maximum frequency of the acoustic modes being approximately 3 THz and the maximum frequency of the optical modes being around 13À14 THz in both cases.…”

Section: Vibrational and Thermodynamic Properties Of The Alsisr Al 2supporting

confidence: 91%

First-principles investigation of the Al–Si–Sr ternary system: Ground state determination and mechanical properties

et al. 2012

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Section: Vibrational and Thermodynamic Properties Of The Alsisr Al 2supporting

confidence: 91%

First-principles investigation of the Al–Si–Sr ternary system: Ground state determination and mechanical properties

et al. 2012

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“…Note that the SrAlSi minority phase (maximum of 5 vol %) found in the Si-containing samples is also superconducting, with a critical temperature of 4.9 K at ambient pressure. 2,42 However, no anomaly corresponding to a transition at this temperature was observed in the lowtemperature properties.…”

Section: Sral 4−x Simentioning

confidence: 84%

Making and Breaking Bonds in Superconducting SrAl_4–xSi_x(0 ≤x≤ 2)

et al. 2017

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We explored the role of valence electron concentration in bond formation and superconductivity of mixed silicon−aluminum networks by using high-pressure synthesis to obtain the BaAl 4 -type structural pattern in solid solution samples SrAl 4−x Si x where 0 ≤ x ≤ 2. Local ordering of aluminum and silicon in SrAl 4−x Si x was evidenced by nuclear magnetic resonance experiments. Subsequent bonding analysis by quantum chemical techniques in real space demonstrated that the strong deviation of the lattice parameters in SrAl 4−x Si x from Vegard's law can be attributed to the strengthening of interatomic Al−Al and Al−Si bonds within the layers (perpendicular to [001]) for 0 ≤ x ≤ 1.5, followed by the breaking of the interlayer bonds (parallel to [001]) for 1.5 < x ≤ 2 and leading to the structural transition from the BaAl 4 structure type with three-dimensional anionic framework at lower x values to the two-dimensional anion of the BaZn 2 P 2 structure type with increasing x values. Low-temperature measurements of the resistivity and heat capacity reveal that SrAl 2.5 Si 1.5 and SrAl 2 Si 2 prepared at high pressures exhibit superconductivity with critical temperatures of 2.1 and 2.6 K, respectively.

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“…Most recently, SrPtAs with a critical temperature of T c ≈ 2.4 K has been of great interest, since it was predicted to be the first chiral, and therefore first intrinsic topological superconductor with a d + id gap on a layered hexagonal lattice [19][20][21]. Among the ternary honeycomb-based superconductors has the MAlSi (M= Ca, Sr, Ba) family been most prominently discussed, with their critical temperature of up to T c = 7.8 K [22][23][24][25][26][27][28][29][30]. SrAlSi and BaAlSi crystallize in the AlB 2 -type structure with Al/Si honeycomb layers, which are intercalated by the earth-alkaline metal [25,26,30].…”

Section: Introductionmentioning

confidence: 99%

Two-gap to Single-gap Superconducting Transition on a Honeycomb Lattice in Ca$_{1-x}$Sr$_{x}$AlSi

Walicka,

Guguchia,

Lago

et al. 2020

Preprint

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It is a well-established fact that the physical properties of compounds follow their crystal symmetries. This has especially pronounced implications on emergent collective quantum states in materials. Specifically, the effect of crystal symmetries on the properties of superconductors is widely appreciated, although the clarification of this relationship is a core effort of on-going research. Emergent phenomena on honeycomb lattices are of special interest, as they can give rise to spectacular phenomenology, as manifested by the recent discovery of correlated states in magic-angle graphene, or by the high-temperature superconductivity in MgB 2 . Here, we report on the structural and microscopic superconducting properties of a class of ternary superconductors with Al/Si honeycomb layers, i.e. Ca 1-x Sr x AlSi. We show that this solid solution is a remarkable model system with a highly tunable two-gap to single-gap superconducting system on a honeycomb lattice, where the superconductivity is enhanced by a subtle structural instability, i.e. the buckling of the Al/Si layers.

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Effect of structure on the superconductivity of CaAlSi and SrAlSi: Density functional calculations

Cited by 6 publications

References 29 publications

First-principles investigation of the Al–Si–Sr ternary system: Ground state determination and mechanical properties

First-principles investigation of the Al–Si–Sr ternary system: Ground state determination and mechanical properties

Making and Breaking Bonds in Superconducting SrAl_4–xSi_x(0 ≤x≤ 2)

Two-gap to Single-gap Superconducting Transition on a Honeycomb Lattice in Ca$_{1-x}$Sr$_{x}$AlSi

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Effect of structure on the superconductivity of CaAlSi and SrAlSi: Density functional calculations

Cited by 6 publications

References 29 publications

First-principles investigation of the Al–Si–Sr ternary system: Ground state determination and mechanical properties

First-principles investigation of the Al–Si–Sr ternary system: Ground state determination and mechanical properties

Making and Breaking Bonds in Superconducting SrAl4–xSix(0 ≤x≤ 2)

Two-gap to Single-gap Superconducting Transition on a Honeycomb Lattice in Ca$_{1-x}$Sr$_{x}$AlSi

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Making and Breaking Bonds in Superconducting SrAl_4–xSi_x(0 ≤x≤ 2)