Low-temperature heat capacity of superconducting ternary iron silicides

Possible multigap superconductivity and magnetism in single crystals of superconducting La2Pt3Ge5and PrSung1, Roh2, Kim3 et al. 2012Phys. Rev. B257230View full textAdd to dashboardCite

“…The parameters obtained are γ n = 4.65 mJ/mol K 2 , β = 1.18 mJ/mol K 4 , and δ = 1.03 × 10 −2 mJ/mol K 6 . The large T 5 term observed in the normal state specific heat indicates a complex phonon density of states, which is similar to the case of single crystals of Lu 2 Fe 3 Si 5 [17,18] and supports the possibility of multi-gap superconductivity.…”

“…[13,14] Among the superconducting 235 compounds, Lu 2 Fe 3 Si 5 has been the focus of particularly intensive research because of its relatively high superconducting phase transition temperature of T c ∼ 6 K and its two-gap superconducting structure. [17] More recently, fully opened superconducting gaps were confirmed by measuring specific heat, [18] penetration depth, [19] and thermal conductivity. [20] Furthermore, different anisotropies of the two bands in Lu 2 Fe 3 Si 5 was also recently reported.…”

“…[8][9][10][11][12][13][14][15][16][17] Most magnetic 235 compounds exhibit a number of interesting properties, such as antiferromagnetic (AF) ordering, [2][3][4][5][6][7][8][9][10][11][12][13][14][15] metamagnetic phase transition (MMT), [5,6] high magnetoresistance (MR), [6,10] the crystalline electric field effect (CEF), [4][5][6][7][8][9][10][11][12] Kondo lattice, [1][2][3][4][10][11][12] and heavy Fermion (HF) behavior. [5,10,14] These interesting characteristics lend these compounds to studies of various novel ground states by the substitution of different elements in them.…”

Noncentrosymmetric superconductivity in a clean crystal of type II superconductor Bi-Pd

“…The value of the ratio ∆C p /γT c is 0.2 which is significantly reduced from the BCS value of 1.43. Low values of ∆C p /γT c have been observed before in the heat-capacity study of several superconducting compounds [22,23]. According to these studies the reduced jump across T c could arise from extrinsic effect (such as inhomogeneity in the sample or magnetic impurities) or from intrinsic effect (such as the existence of regions which do not participate in superconductivity).…”

Superconductivity in Noncentrosymmetric BiPd System

“…The value of the ratio ∆C p /γT c is 0.2 which is significantly reduced from the BCS value of 1.43. Low values of ∆C p /γT c have been observed before in the heatcapacity study of several superconducting compounds 22,23 . According to these studies the reduced jump across T c could arise from extrinsic effect (such as inhomogeneity in the sample or magnetic impurities) or from intrinsic effect (such as the existence of regions which do not participate in superconductivity).…”