Thermally activated flux motion in optimally electron-doped (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 and Ca10(Pt3As8)((Fe0.92Pt0.08)2As2)5 single crystals

Difference in anisotropic vortex pinning in pristine and proton-irradiated (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 single crystals

“…In addition, the TAFM experiment was performed under the same conditions in the Ca8.5La1.5(Pt3As8)(Fe2As2)5 single crystal irradiated with protons. For the B//c-axis, both pristine and proton irradiated samples showed magnetic field dependence on the zero-temperature activation energy of U0 ~ B -α , similar to the previously reported results 27 . Interestingly, in proton irradiated samples with more point defects, the magnitude of U0 increased over the entire magnetic field region compared to that in pristine samples.…”

“…(4). For the pristine and proton irradiated samples, Compared with iron-based superconductors showing similar Tc, the magnitude of U0(B) in our sample is significantly larger, which means that strong pinning occurred in our sample 27,[36][37][38] . Since the coherence length in the direction perpendicular to the c-axis is about 20 Å, which is about 2.5 times larger than the lattice constants a and b, as discussed above, the normal component region with zero…”

“…For the study of Tc enhancement as well as the delicate relationship between electronic structure and superconductivity, many experiments such as transport 13,18 , APRES 12,19 , pressure effect 20 , infrared spectroscopy [21][22][23] , upper critical field 11,18,24 , penetration depth 25,26 and thermally activated flux motion (TAFM) 27 have been performed. Recently, TAFM experiments 27 have already been performed for La-doped Ca10-3-8 in the B//c-axis direction up to B=6 T. The result of TAFM analysis for this experiment showed the magnetic field dependence of U0 ~ B -α on the zero-temperature activation energy in the entire measured magnetic field region, which was suggested to be due to the entanglement of vortex lines pinned to the point defect. To understand this more clearly in this paper, we performed TAFM experiments in two directions of B//c-axis and B//ab-plane up to 13 T for Ca8.5La1.5(Pt3As8)(Fe2As2)5 single crystal.…”

Physical properties of superconducting Ca10(Pt4As8)((Fe0.92Pt0.08)2As2)5 crystal and comprehensive cognition on the transition temperature for Ca10-3(4)-8

“…To comprehend the transport properties in Ca10-3-8 and Ca10-4-8 systems, it is necessary to understand: 1, the electronic properties of both the Pt n−δ As 8 and Fe 1−x Pt x As layers, 2, the relationship between T c and variables n, x and δ. In figure 12(a), we plot T c versus total Pt concentration (n-δ+10x) of Ca 10 (Pt n−δ As 8 )((Fe 1−x Pt x ) 2 As 2 ) 5 available in the literature [1][2][3][7][8][9][10][11][12].…”

Optical Properties in The Hole-Doped Ca8.5Na1.5(Pt3As8)(Fe2As2)5 Single Crystal

“…To study the delicate relationship between electronic structure and superconductivity, various experiments such as transport 1,12 , ARPES 11,13 , upper critical field 10,12,14 , thermally activated vortex pinning 15 , pressure effect 16 , penetration depth 17,18 , infrared spectroscopy experiments [19][20][21] , etc. have already been performed in the Ca10-3-8 family.…”