Publisher's Note: Theory of superconductor-ferromagnet point-contact spectra: The case of strong spin polarization [Phys. Rev. B81, 094508 (2010)]

Evidence for spin mixing in holmium thin film and crystal samples

“…Theoretical calculations of the expected Andreev conductance spectra in the presence of the LRSTPE [34][35][36][37] indicate that spin mixing at the S/F interface leads to an enhancement of the sub-gap conductance, either via a direct increase in the conductance 34 or via the formation of Andreev bound states 36 . A number of experimental reports have shown possible signatures of the LRSTPE [38][39][40] , although it remains to be determined what the 'signature' of the LRSTPE is in the Andreev reflection spectra.…”

Inverse proximity effect and influence of disorder on triplet supercurrents in strongly spin-polarized ferromagnets

“…Their functional dependence on k || was investigated extensively in Ref. 24. In order to discuss various symmetry components of the induced triplet pair correlations, We use the following decomposition of the quasiclassical Green functions:…”

“…[11][12][13][14][15] The systems under investigation varied largely in terms of materials and fabrication, the common idea being that a breaking of spin-rotation symmetry around the bulk magnetization axis must somehow be enforced at the superconductor (SC)-ferromagnet (FM) contacts -which is in line with the general theoretical concepts behind this effect 1,[17][18][19][20][21] . In this article, we elaborate on our earlier work concerning long-range triplet supercurrents 22 , where we used a recent extension of the quasiclassical Green function technique 23 , that allows us to consider ferromagnets whose exchange splitting J is of the same order of magnitude as the Fermi energy E F consistently within quasiclassical theory 22,24 . In the following we include additional relevant effects like the suppression of the superconducting energy gap in proximity to the interfaces, the induced magnetization in the superconductor close to the ferromagnet, and disorder in the FM bulk.…”

Andreev spectroscopy of CrO 2 thin films on TiO 2 and Al 2 O 3

“…Here we examine the spectroscopic information from single S/F, Pb/CrO 2 contacts using CrO 2 thin films grown on Al 2 O 3 or TiO 2 substrates [11,12]. We do this in the context of the Mazin modified Blonder-Tinkham-Klapwijk (BTK) [13,14] and the more recent LRSTPE spin mixing model (SMM) [3,15] and find that the latter suggests that CrO 2 has strong intrinsic spin mixing properties independent of the substrate on which it is grown.…”

“…[3], the value of P was assumed to be fixed to 100% while the misalignment angle, α, was fixed at π/2 as described in refs. [3,15] and used in [3]. For fitting to the Mazin modified BTK model, the fit parameters were the polarisation, P , Z BTK and r s .…”