Specific Heat and Upper Critical Field of Sc₅Ir₄Si₁₀Superconductor

Abstract

Temperature and magnetic field dependent specific heat of textured Sc 5 Ir 4 Si 10 superconductor was investigated in detail. Based on the fitting of zero-field electronic specific heat by different gap structures as well as the discussion on field-induced specific heat coefficient, Sc 5 Ir 4 Si 10 is proved to be an anisotropic s-wave superconductor with a gap anisotropy, min max / Δ Δ , of 0.53. The anisotropy of upper critical field suggests the weakly one-dimensional Fermi surface, and the value is consistent with the gap anisotropy result obtained from the specific heat data.

Superconductivity in a new layered triangular-lattice system Li2IrSi2

“…Several Ir-based superconductors have been reported till date, which include MIr 2 As 2 (M=Sr, Ba, Y, La) [6][7][8][9], Ir 1−x Pt x Te 2 [10][11][12], SrIr 2 [13], B 2 IrT 2 (T=Mo, V) [14], ThIr, MIr 2 (M=Sc, Y, La), MIr 3 (M=La, Th, Ce), MIr 5 (M=La, Th, Ce), Y 3 Ir 2 [15], IrGe [16], M 5 Ir 4 Si 10 (M=Sc, Y, Lu), M 5 Ir 4 Ge 10 (M=Y, Lu) [17][18][19][20], IrTe 3 [21], MIr 2 Si 2 (M=Y, La) [22], and Li 2 IrSi 3 [23,24]. Among these superconductors, Sc 5 Ir 4 Si 10 has the highest T c of ∼8.5 K, which is ascribed to the large density of states (DOS) at the Fermi level (E F ) with moderate electron-phonon coupling [25].…”

Electronic, phononic and superconducting properties of trigonal Li2 MSi2 (M = Ir, Rh)

“…There are many other examples including the elements for transition metals, which mainly include, Co, Ni, Fe, Mo, W, Mn, Cu, Ru, Pd, Ir, and Rh. Distinctively, the Ir atom related 5d and Rh atom related 4d transition-metal compounds such as M 2 Ir 2 As 2 (M = Sr, Ba, Y, La) [13][14][15][16], Ir 1−x Pt x Te 2 [17,18], Sr 2 Ir 2 [19], B 2 IrT 2 (T = Mo, V) [20], MGe (M = Rh, Pd, Ir and Pt) [21,22], MIr 2 (M = Sc, Y, La), MIr 3 (M = La, Th, Ce), MIr 5 (M = La, Th, Ce), M 5 Ir 4 Si 10 (M = Sc, Y, Lu), M 5 Ir 4 Ge 10 (M = Y, Lu) [23][24][25], MIr 2 Si 2 (M = Y, La) [26], Li 2 Ir 2 Si 3 [27,28], Li 2 IrSi 2 [7], Li 2 RhSi 2 [7], Rh 17 S 15 [12], MRh 2 Sn (M = Sc, Lu, Y) [29], Y 5 Rh 6 Sn 18 [30] were studied and their superconductivity properties were characterized. Interestingly, these compounds with the Si atoms are crystallized with polar noncentrosymmetric crystal structures [27].…”