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Fermi surface and order parameter driven vortex lattice structure transitions in twin-free YBa2Cu3O7.

J S White¹, V Hinkov, R W Heslop

¹School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom.

Physical Review Letters

|April 28, 2009

Summary

We observed new vortex lattice structures in YBa2Cu3O7 using neutron scattering. These structures change with magnetic field, revealing insights into superconductivity and Fermi surface effects.

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Area of Science:

Condensed matter physics
Superconductivity
Materials science

Background:

Understanding the vortex lattice (VL) structure in high-temperature superconductors is crucial for explaining their superconducting properties.
YBa2Cu3O7 is a model system for studying vortex matter due to its unique properties.

Purpose of the Study:

To investigate the intrinsic vortex lattice structure in detwinned YBa2Cu3O7.
To identify phase transitions and structural changes in the vortex lattice under varying magnetic fields.

Main Methods:

Small-angle neutron scattering (SANS) was employed to study the vortex lattice.
Experiments were conducted at low temperatures (2 K) and high magnetic fields (up to 10.8 T).

Main Results:

A new distorted hexagonal vortex lattice phase was stabilized at intermediate fields due to suppressed pinning.
First-order transitions were observed at 2.0(2) T and 6.7(2) T, indicating changes in vortex lattice symmetry and distortion.
The transition at 6.7(2) T suggests a crossover from Fermi surface anisotropy dominance to order-parameter anisotropy control.

Conclusions:

The study reveals complex vortex lattice phase behavior in YBa2Cu3O7, influenced by both Fermi surface and order-parameter anisotropy.
The findings provide critical insights into the fundamental physics governing superconductivity in cuprates.