Lisa Maria Paulius

Superconducting transition and phase diagram of single-crystal MgB2

The superconducting phase diagram of

Superconducting phase diagram of single-crystal MgB2

{\mathrm{MgB}}_{2}

Scanning SQUID susceptometers with sub-micron spatial resolution

was determined from magnetization, magnetotransport, and single-crystal specific-heat measurements. A zero-temperature in-plane coherence length of 9.4 nm is determined. The superconducting anisotropy \ensuremath{\gamma} increases from a value around 2 near

Effects of successive proton irradiation on the peak effect in YBa2Cu3O7−δ single crystals

{T}_{c}

The effect of disorder on the critical points in the vortex phase diagram of YBCO

to above 4.5 at 22 K. For

Effects of proton irradiation on the high-temperature superconducting system Y1−xPrxBa2Cu3O7−δ

H\ensuremath{\parallel}c

The response of small SQUID pickup loops to magnetic fields

a pronounced peak effect in the critical current occurs at the upper critical field. Evidence for a surface superconducting state is presented for

Using radiation damage to increase critical currents in high temperature superconductors

H\ensuremath{\parallel}c

Determining the vibrations between sensor and sample in SQUID microscopy

that might account for the widespread in reported values of \ensuremath{\gamma}.

Phase Diagram of Single Crystal MgB2

Abstract The superconducting phase diagram of single-crystal MgB 2 has been determined using magnetization, magneto-transport and specific heat measurements. A value of 9.4 nm is found for the zero-temperature in-plane coherence length. The superconducting anisotropy coefficient, γ , increases monotonously from a value around 2 near T c to 4.5 at low temperature. The current dependence and angular dependence of the resistive transitions give evidence for a surface superconducting state for H ∥ c which might account for the wide spread in reported values of the superconducting anisotropy.