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Scanning SQUID Study of Vortex Manipulation by Local Contact

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Published on: February 1, 2017

Ordered, disordered, and coexistent stable vortex lattices in NbSe2 single crystals.

G Pasquini¹, D Pérez Daroca, C Chiliotte

¹Departamento de Física, FCEyN, Universidad de Buenos Aires, Pabellon 1, Ciudad Universitaria, Buenos Aires, Argentina. pasquini@df.uba.ar

Physical Review Letters

|July 23, 2008

Summary

The peak effect in type II superconductors involves vortex lattice (VL) order-disorder transitions. This study reveals distinct VL configurations, including ordered, disordered, and intermediate states, clarifying the physics of the peak effect.

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Area of Science:

Condensed Matter Physics
Superconductivity Research
Materials Science

Background:

The peak effect (PE) in type II superconductors is linked to vortex lattice (VL) order-disorder transitions, though its physics is debated.
Metastabilities often obscure stationary VL configurations, complicating PE studies.

Purpose of the Study:

To investigate the underlying physics of the peak effect in type II superconductors.
To access and examine stationary vortex lattice configurations by avoiding reorganization.

Main Methods:

Utilized shaking and thermal protocols on NbSe2 single crystals.
Employed linear ac susceptibility measurements to probe VL configurations without inducing reorganization.

Main Results:

Identified three distinct temperature-dependent regions for VL configurations.
Observed maximally ordered VL for TT2(H).
Discovered intermediate, temperature-dependent disorder in the T1

Conclusions:

The peak effect region likely involves a coexistence of ordered and disordered vortex lattice states.
Provides a clearer understanding of the vortex lattice behavior associated with the peak effect in superconductors.