Crystal growth by Bridgman and Czochralski method of the ferromagnetic quantum critical material YbNi4P2

• Successful single crystal growth of YbNi4P2 by Bridgman and Czochralski method.
• Large and inclusion free single crystals grown from levitating melt.
• Single crystals exhibit RR1.8K=17.

The tetragonal YbNi4P2 is one of the rare examples of compounds that allow the investigation of a ferromagnetic quantum critical point. We report in detail on two different methods which have been used to grow YbNi4P2 single crystals from a self-flux. The first, a modified Bridgman method, using a closed crucible system yields needle-shaped single crystals oriented along the [001]-direction. The second method, the Czochralski growth from a levitating melt, yields large single crystals which can be cut in any desired orientation. With this crucible-free method, samples without flux inclusions and a resistivity ratio at 1.8 K of RR1.8K=17 have been grown.