Small Angle Neutron Scattering and Magnetization Measurements in the Cubic (K,Ba)BiO3 Superconductor

I. Joumard; J. Marcus; T. Klein; R. Cubitt

doi:10.1103/PhysRevLett.82.4930

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Small Angle Neutron Scattering and Magnetization Measurements in the Cubic (K,Ba)BiO3 Superconductor

I. Joumard, J. Marcus, T. Klein, R. Cubitt

DOI 10.1103/PhysRevLett.82.4930 · Physical Review Letters

T1

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Abstract

We report on both small angle neutron scattering and magnetization measurements in the cubic (K,Ba)BiO3 superconductor. We show that the flux lines are ordered into a hexagonal lattice at low field ( B<Be∼0.6T) and that the diffracted intensity continuously drops to zero as the magnetic field is increased towards Be. This intensity fall is attributed to a static Debye-Waller factor associated with disorder induced longitudinal fluctuations of the vortex lines. We show that Be lies close to the onset of the anomalous “peak effect” in magnetization measurements, suggesting that this peak is related to the change in the structure of the vortex solid.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(K,Ba)BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure not reported	unknown
(K,Ba)BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23.3	Pressure not reported	unknown