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Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa2CuO4+δ
Serena Eley1,2, Roland Willa3,4, Mun K Chan5
1Department of Physics, Colorado School of Mines, Golden, CO, 80401, USA. serenaeley@mines.edu.
Scientific Reports
|June 26, 2020
Summary
This study investigates vortex dynamics in HgBa2CuO4+δ superconductors, revealing glassy behavior and crossovers in vortex motion. Findings show how vortex dynamics change with temperature and magnetic fields.
Area of Science:
- Condensed Matter Physics
- Superconductivity Research
Background:
- HgBa2CuO4+δ is a model system for studying highly anisotropic superconductors.
- Understanding vortex dynamics is crucial for superconductor applications.
Purpose of the Study:
- To extensively study vortex dynamics in HgBa2CuO4+δ.
- To construct a detailed vortex phase diagram.
- To investigate the effects of anisotropy on vortex behavior.
Main Methods:
- Magnetization measurements (M) over a wide range of temperatures (T) and fields (H).
- Analysis of vortex creep rates S(T, H) = |dlnM(T, H)/dlnt|.
- Construction of a vortex phase diagram.
Main Results:
- Temperature-dependent vortex penetration field (Hp(T)), second magnetization peak (Hsmp(T)), and irreversibility field (Hirr(T)) decay exponentially at low temperatures.
- Abrupt changes in behavior observed at high temperatures (T/Tc > 0.5).
- Evidence of glassy behavior with collective creep of 2D pancake vortices.
- Observation of crossovers from elastic dynamics to plastic flow, tuned by temperature and time.
Conclusions:
- The second magnetization peak coincides with the elastic-to-plastic crossover at low temperatures.
- The mechanism governing vortex dynamics changes at higher temperatures.
- Anisotropy significantly influences vortex behavior in HgBa2CuO4+δ.
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