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We report here on a new heat treatment to prepare both dense polycrystallineand single crystal MgB2 high quality samples in one single process. Resistivitymeasurements for polycrystalline part of the sample gives a residualresistivity ratio RRR=16.6 and a very low normal state resistivity rho(40K)=0.28 microOhmcm. Both SEM and SQUID study on polycrystals reveal the highquality, dense character and well coupling of grain boundaries. On the otherhand, the high quality single crystals have a unique shape that resembles thehexagonal crystal structure. SQUID measurements reveals very weak flux pinningcharacter implying our single crystals to be very clean. In this study, weconclude that heat treatment is playing a major rule on the characteristics ofboth polycrystalline and single crystal MgB2. Samples are thoroughlycharacterized by x-ray, resistivity, dc SQUID and SEM

A new heat treatment to prepare high-quality polycrystalline and single crystal MgB2in a single process

A new heat treatment to prepare high-quality polycrystalline and single crystal MgB₂in a single process