Peak Effect in Single Crystal MgB2 Superconductor for H∥c-Axis

M. Pissas; S. Lee; A. Yamamoto; S. Tajima

doi:10.1103/PhysRevLett.89.097002

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Peak Effect in Single Crystal MgB2 Superconductor for H∥c-Axis

M. Pissas, S. Lee, A. Yamamoto, S. Tajima

DOI 10.1103/PhysRevLett.89.097002 · Physical Review Letters

T1

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Abstract

We have studied the phase diagram of the MgB2 superconductor using a single crystal for the H∥c-axis. For the first time we report the existence of peak effect in the screening current in the MgB2 for the H∥c-axis. In the magnetic field regime 10<H<13.5 kOe the local fundamental diamagnetic moment displays a very narrow diamagnetic step. For higher fields this step is transformed to a peak (peak effect) and, finally, for H<10 kOe the diamagnetic step is transformed to a gradual transition.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38.3	Pressure not reported	onset