Angle dependence of <i>H</i><sub>c2</sub> with crossover between the orbital and paramagnetic limits in 2D NbSe<sub>2</sub>
ORAL
Abstract
Transition metal dichalcogenides (TMDs) are layered materials of abundant variety, providing emergent two-dimensional (2D) physical phenomena such as 2D superconductivity in few-layer NbSe2. In the previous APS March Meeting, we reported layer-by-layer MBE growth of NbSe2 thin films on insulating sapphire substrates [1], achieving relatively high Tc comparable to that of bulk in the thick-enough regime. With reducing thickness, superconducting properties turned out to exhibit 2D-like behavior, realizing Ising superconductivity with large-area samples. In this presentation, we will present the experimental data on the angle dependence of Hc2 in a bilayer NbSe2 film measured with a 55 T pulsed magnet at 3He temperature. We observed cusp-like angle dependence of Hc2 around the parallel magnetic fields even far below Tc despite that Hc2 is purely dominated by the paramagnetic effect in this regime. In order to explain those results, we will propose a generalized Ginzburg-Landau model by taking into account the paramagnetic effect, which well describes the results with a microscopic physical picture. [1] H. Matsuoka et al, APS March Meeting 2018, K35.00009.
–
Presenters
-
Hideki Matsuoka
- Univ of Tokyo
- Department of Applied Physics, The University of Tokyo