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X Montiel - One of the best experts on this subject based on the ideXlab platform.

  • tunable Critical Field in rashba superconductor thin films
    Physical Review B, 2021
    Co-Authors: L Olde A B Olthof, J R Weggemans, Graham Kimbell, J W A Robinson, X Montiel
    Abstract:

    Strong intrinsic or interfacial spin-orbit coupling (SOC) can enable a thin-film superconductor to exceed the paramagnetic limit. For Rashba-type SOC, we show that the superconducting thermodynamic properties of a finite-size thin film are strongly sample-size dependent due to the creation of edge states; for example, in the case of geometrically anisotropic thin films, the Critical Field is found to be tunable through the direction of an externally applied in-plane magnetic Field. These findings open perspectives for the development of superconducting spin-orbitronic devices.

O N Shevtsova - One of the best experts on this subject based on the ideXlab platform.

D Eckert - One of the best experts on this subject based on the ideXlab platform.

  • upper Critical Field and irreversibility line in superconducting mgb2
    Solid State Communications, 2001
    Co-Authors: G. Fuchs, K. Nenkov, K H Muller, A Handstein, V N Narozhnyi, D Eckert, M Wolf, L Schultz
    Abstract:

    Abstract The upper Critical Field Hc2(T) of sintered pellets of the recently discovered MgB2 superconductor was investigated by transport, ac susceptibility and dc magnetization measurements in magnetic Fields up to 16 T covering a temperature range between T c ∽39 K and T=3 K ∽0.1T c . The temperature dependence of the upper Critical Field, Hc2(T), shows a positive curvature near Tc similar to that found for the borocarbides YNi2B2C and LuNi2B2C indicating that MgB2 is in the clean limit. The irreversibility line was consistently determined from dc magnetization measurements and from the imaginary component of ac susceptibility. The irreversibility Field was found to increase up to 8.5 T at 10 K.

  • The upper Critical Field in superconducting MgB2
    Journal of Alloys and Compounds, 2001
    Co-Authors: K H Muller, G. Fuchs, K. Nenkov, A Handstein, V N Narozhnyi, D Eckert
    Abstract:

    The upper Critical Field Hc2(T) of sintered pellets of the recently discovered MgB2 superconductor was investigated by transport, ac susceptibility and dc magnetization measurements in magnetic Fields up to 16 T covering a temperature range between Tc∼39 K and T=3 K∼0.1Tc. The Hc2 data from ac susceptibility are consistent with resistance data and represent the upper Critical Field of the major fraction of the investigated sample which increases up to Hc2(0)=13 T at T=0 corresponding to a coherence length of ξo=5.0 nm. A small fraction of the sample exhibits higher upper Critical Fields which were measured both resistively and by dc magnetization measurements. The temperature dependence of the upper Critical Field, Hc2(T), shows a positive curvature near Tc and at medium temperatures indicating that MgB2 is in the clean limit. The Hc2(T) dependence can be described within a broad temperature region 0.3Tc

  • upper Critical Field and irreversibility line in superconducting mgb_2
    arXiv: Superconductivity, 2001
    Co-Authors: G. Fuchs, K. Nenkov, K H Muller, A Handstein, V N Narozhnyi, D Eckert, M Wolf, L Schultz
    Abstract:

    The upper Critical Field Hc2(T) of sintered pellets of the recently discovered MgB_2 superconductor was investigated by transport, ac susceptibility and dc magnetization measurements in magnetic Fields up to 16 T covering a temperature range between Tc ~ 39 K and T = 3 K ~ 0.1Tc. The temperature dependence of the upper Critical Field, Hc2(T), shows a positive curvature near Tc similar to that found for the borocarbides YNi_2B_2C and LuNi_2B_2C indicating that MgB_2 is in the clean limit. The irreversibility line was consistently determined from dc magnetization measurements and from the imaginary component of ac susceptibility. The irreversibility Field was found to increase up to 8.5 T at 10 K.

Jean-pascal Brison - One of the best experts on this subject based on the ideXlab platform.

  • Pressure dependence of superconducting Critical temperature and upper Critical Field of 2H-NbS2
    Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013
    Co-Authors: V.g. Tissen, Jean-pascal Brison, M.r. Osorio, N.m. Nemes, M. Garcia-hernandez, Laurent Cario, Pierre Rodiere, Sebastian Vieira, H. Suderow
    Abstract:

    We present measurements of the superconducting Critical temperature T-c and upper Critical Field H-c2 as a function of pressure in the transition metal dichalcogenide 2H-NbS2 up to 20 GPa. We observe that Tc increases smoothly from 6 K at ambient pressure to about 8.9 K at 20 GPa. This range of increase is comparable to the one found previously in 2H-NbSe2. The temperature dependence of the upper Critical Field H-c2(T) of 2H-NbS2 varies considerably when increasing the pressure. At low pressures, H-c2(0) decreases, and at higher pressures both T-c and H-c2(0) increase simultaneously. This points out that there are pressure induced changes of the Fermi surface, which we analyze in terms of a simplified two-band approach.

  • The upper Critical Field of CeCoIn5
    New Journal of Physics, 2011
    Co-Authors: Ludovic Howald, Georg Knebel, Dai Aoki, Gerard Lapertot, Jean-pascal Brison
    Abstract:

    We present a detailed analysis of the upper Critical Field for CeCoIn5 under high pressure. We show that, consistent with other measurements, this system shows a decoupling between the maximum of the superconducting transition temperature Tc and the maximum pairing strength. We propose a model in which, in order to account for the discrepancy in pressure between the maximum of the upper Critical Field and the maximum of Tc, we introduce magnetic pair-breaking effects, already widely suggested by other measurements. We found that within the Eliashberg frame work, the unusual shape of Hc2(T) can be completely reproduced when magnetic pair breaking is taken into account. Surprisingly, we found that the maximum of pair breaking and of pair coupling coincide in pressure, suggesting that both mechanisms originate from quantum Criticality. Our model implies that CeCoIn5 is the first compound of its family that shows clear decoupling between the maximum of Tc and quantum Criticality.

Takehiko Ishiguro - One of the best experts on this subject based on the ideXlab platform.

  • in plane anisotropy of upper Critical Field in sr2ruo4
    Physical Review Letters, 2000
    Co-Authors: Y Maeno, S Nishizaki, Takashi Akima, Takehiko Ishiguro
    Abstract:

    : We investigated the behavior of the spin-triplet superconductor Sr2RuO4 ( T(c) approximately 1.5 K) under the magnetic Fields parallel to the quasi-two-dimensional plane. The upper Critical Field H(c2) exhibits a clear fourfold anisotropy of about 3% at 0.35 K. Furthermore, we detected an additional transition feature below H(c2) in both the ac susceptibility and the specific heat. These second-transition features as well as the pronounced in-plane H(c2) anisotropy disappear above 0.8 K or under intentional Field misalignment of less than 1 degrees. Most of these characteristics are consistent with the predicted emergence of the second superconducting phase with a line-node gap.