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Phase-Slip Processes in Superconducting Films: AC Josephson Effect and New Phase Transition

100%
Dmitriev V., Zolochevskii I., Bezuglyi E., Kondrashev D.
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EN
The resistive direct current state in wide thin superconducting films as the phase transition from superconducting to normal state is investigated in the absence of external magnetic field. We showed that the states of a wide film with increasing transport current appear in the following order: the superconducting state; the resistive vortex state; the critical state; the new vortex-free resistive state with phase-slip lines; the normal state. We detected the Shapiro current steps on the current-voltage characteristic of the wide film, which arise due to interaction of intrinsic Josephson radiation of phase-slip lines with external microwave irradiation.
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Superconductivity and Magnetism of Dy_{1-x}Y_xRh_4B_4: Candidate for Spin-Triplet Cooper Pairing

76%
Dmitriev V., Zaleski A., Khlybov E., Rybaltchenko L., Khristenko E., Ishchenko L., Terekhov A.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
83-90
EN
In this work for the first time we give the evidence that compound Dy_{1-x}Y_x Rh_4B_4 with the tetragonal body-centered crystal structure LuRu_4B_4 is the ferrimagnetic at temperatures T_{Cur}<40 K, ferrimagnetic superconductor at T_C <10 K and antiferromagnetic superconductor at T_N <3 K. No reentrant behavior was found down to T = 0.32 K. For the first time by means of a method of microcontact spectroscopy of the Andreev reflection in point contact Ag-Dy_{0.8}Y_{0.2}Rh_4B_4 the value and temperature and field dependences of superconducting gap parameter∆(T, H) in Dy_{0.8}Y_{0.2}Rh_4B_4 were determined. The value of the ratio 2∆(0)/kT_C is about 4. Some unusual features of∆(T, H) dependences were observed, which give the evidence that the Dy_{1-x}Y_xRh_4B_4 is a candidate for spin-triplet Cooper pairing of charges with the parallel spins.
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Andreev Reflection Study of the Superconductor Mo_3Sb_7

76%
Dmitriev V., Rybaltchenko L., Khristenko E., Ishchenko L., Bukowski Z., Troć R.
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EN
The point-contact Andreev-reflection measurements on the new paramagnetic superconductor Mo_3Sb_7 were carried out. It was found that the order parameter ∆ is strongly anisotropic varying over a very wide range depending on the contact orientation when the maximum ∆_{max} exceeds at least 40 times the minimum ∆_{min} in spite of the invariable T_c that cannot be typical of conventional superconductors. For these and other reasons we suggest that Mo_3Sb_7 is not a trivial BCS (s-wave) superconductor but rather has some unconventional pairing symmetry.
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