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- W2064975414 abstract "We report the results of a study of superconducting proximity effects in clean ferromagnet/ferromagnet/superconductor (${mathrm{F}}_{1}{mathrm{F}}_{2}mathrm{S}$) heterostructures, where the pairing state in S is a conventional singlet $s$-wave. We numerically find the self-consistent solutions of the Bogoliubov-de Gennes (BdG) equations and use these solutions to calculate the relevant physical quantities. By linearizing the BdG equations, we obtain the superconducting transition temperatures ${T}_{c}$ as a function of the angle $ensuremath{alpha}$ between the exchange fields in ${mathrm{F}}_{1}$ and ${mathrm{F}}_{2}$. We find that the results for ${T}_{c}(ensuremath{alpha})$ in ${mathrm{F}}_{1}{mathrm{F}}_{2}mathrm{S}$ systems are clearly different from those in ${mathrm{F}}_{1}mathrm{S}{mathrm{F}}_{2}$ systems, where ${T}_{c}$ monotonically increases with $ensuremath{alpha}$ and is highest for antiparallel magnetizations. Here, ${T}_{c}(ensuremath{alpha})$ is in general a nonmonotonic function, and often has a minimum near $ensuremath{alpha}ensuremath{approx}{80}^{ensuremath{circ}}$. For certain values of the exchange field and layer thicknesses, the system exhibits reentrant superconductivity with $ensuremath{alpha}$: it transitions from superconducting to normal, and then returns to a superconducting state again with increasing $ensuremath{alpha}$. This phenomenon is substantiated by a calculation of the condensation energy. We compute, in addition to the ordinary singlet pair amplitude, the induced odd triplet pairing amplitudes. The results indicate a connection between equal-spin triplet pairing and the singlet pairing state that characterizes ${T}_{c}$. We find also that the induced triplet amplitudes can be very long ranged in both the S and F sides and characterize their range. We discuss the average density of states for both the magnetic and the S regions, and its relation to the pairing amplitudes and ${T}_{c}$. The local magnetization vector, which exhibits reverse proximity effects, is also investigated." @default.
- W2064975414 created "2016-06-24" @default.
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- W2064975414 date "2012-07-31" @default.
- W2064975414 modified "2023-09-23" @default.
- W2064975414 title "Proximity effects and triplet correlations in ferromagnet/ferromagnet/superconductor nanostructures" @default.
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- W2064975414 doi "https://doi.org/10.1103/physrevb.86.014523" @default.
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