title: Enhancement of superconductivity under pressure and the magnetic phase diagram of tantalum disulfide single crystals.
abstract: In low-dimensional electron systems, charge density waves (CDW) and superconductivity are two of the most fundamental collective quantum phenomena. For all known quasi-two-dimensional superconductors, the origin and exact boundary of the electronic orderings and superconductivity are still attractive problems. Through transport and thermodynamic measurements, we report on the field-temperature phase diagram in 2H-TaS2 single crystals. We show that the superconducting transition temperature (Tc) increases by one order of magnitude from temperatures at 0.98 K up to 9.15 K at 8.7 GPa when the Tc becomes very sharp. Additionally, the effects of 8.7 GPa illustrate a suppression of the CDW ground state, with critically small Fermi surfaces. Below the Tc the lattice of magnetic flux lines melts from a solid-like state to a broad vortex liquid phase region. Our measurements indicate an unconventional s-wave-like picture with two energy gaps evidencing its multi-band nature.
authors.affiliation: Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China.|Faculty of science, Physics department, Fayoum University, 63514-Fayoum- Egypt.
authors.forename: M
authors.initials: M
authors.lastname: Abdel-Hafiez
authors.affiliation: Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China.|Department of Physics, South China University of Technology, Guangzhou 510640, China.
authors.forename: X-M
authors.initials: XM
authors.lastname: Zhao
authors.affiliation: Institute of Metal Physics, National Academy of Sciences of Ukraine, 03142 Kyiv, Ukraine.
authors.forename: A A
authors.initials: AA
authors.lastname: Kordyuk
authors.affiliation: Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China.
authors.forename: Y-W
authors.initials: YW
authors.lastname: Fang
authors.affiliation: State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
authors.forename: B
authors.initials: B
authors.lastname: Pan
authors.affiliation: Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China.|State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
authors.forename: Z
authors.initials: Z
authors.lastname: He
authors.affiliation: Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China.
authors.forename: C-G
authors.initials: CG
authors.lastname: Duan
authors.affiliation: Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, China.|Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China.
authors.forename: J
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China.
authors.forename: X-J
authors.initials: XJ
authors.lastname: Chen