Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.5: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

High-Pressure Magnetic Measurements of 2H-NbSe2 — •Israel Osmond and Sven Friedemann — HH Wills Laboratory, University of Bristol, UK

With superconductivity often found in the vicinity of ordered states such as charge density waves (CDW) and antiferromagnetism, the ability to tune materials through these states serves as a vital tool in exploring the interplay of these phases with superconductivity. For characterizing a given superconductor, magnetic measurements provide a non-invasive method of studying vortex dynamics and measuring critical temperatures and fields.

Likewise, pressure measurements serve as a continuous tuning parameter across many of these phases. As such, the application of pressure provides a method to both access novel structures not available at ambient pressure, and to explore the competition between phases such as the CDW and superconducting order. This work develops current pressure cell technology compatible with commercial SQUID magnetometers, with both piston cylinder and gemstone anvil type cells.

Previous research into 2H-NbSe2 has shown multiband superconductivity, CDW ordering, and the existence of a quantum critical point beneath the superconducting state. Here, we use the aforementioned pressure cells for magnetic susceptibility measurements, mapping the behaviour of the lower critical field and Tc with pressure and temperature. These provide insight into the multiband nature of superconductivity in this material, and provide evidence for a competition between the CDW and superconducting phases.

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