| Autor: |
White JS, Heslop RW, Holmes AT, Forgan EM, Hinkov V, Egetenmeyer N, Gavilano JL, Laver M, Dewhurst CD, Cubitt R, Erb A |
| Rok vydání: |
2011 |
| Zdroj: |
PHYSICAL REVIEW B |
| DOI: |
10.1103/PhysRevB.84.104519 |
| Popis: |
The vortex lattice (VL) in the high ? superconductor YBa2Cu3O7 at 2 K and with the magnetic field parallel to the crystal c axis undergoes a sequence of transitions between different structures as a function of applied magnetic field. However from structural studies alone it is not possible to determine precisely the system anisotropy that governs the transitions between different structures. To address this question here we report new small angle neutron scattering measurements of both the VL structure at higher temperatures and the field and temperature dependence of the VL form factor. Our measurements demonstrate how the influence of anisotropy on the VL which in theory can be parameterized as nonlocal corrections becomes progressively important with increasing magnetic field and suppressed by increasing the temperature toward Tc. The data indicate that nonlocality due to different anisotropies plays an important role in determining the VL properties. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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