Field induced phases in UPtSi2


Field induced phases in UPtSi2

Schulze Grachtrup, D.; Süllow, S.; Bleckmann, M.; Willenberg, B.; Mydosh, J.; Skourski, Y.; Rakoto, H.; Bartkowiak, M.; Sheikin, I.

Tetragonal UPtSi2 has recently been characterized as moderately mass enhanced antiferromagnetic compound, which in various physical properties and in low magnetic fields reveals a resemblance to URuSi2 [1-3]. In contrast to URuSi2 with the order parameter still unknown, UPtSi2 was shown to order antiferromagnetically below TN = 32 K in zero magnetic field [1]. Here, we present an extensive study of the behaviour of UPtSi2 in high magnetic fields. We have examined single crystalline UPtSi2 with resistivity and magnetization measurements in pulsed and static magnetic fields up to 50 T. Initially, and as it is typical for antiferromagnets, in these measurements we find the antiferromagnetic phase transition at TN = 32 K in zero field to shift downwards with increasing field for both crystallographic axes. However, below ~15 K and for magnetic fields B parallel to the a axis we see this transition to split up, forming a new and distinct high field phase between ~38 T and 45 T. Similarly, with the magnetic field applied parallel to the c axis we also find a splitting resulting in a new high field phase between 24 T and 31 T. Moreover, below 5 K our measurements along c axis show even more structure, indicating the presence of at least one more high field phase between 29 T and 33 T. Altogether, our data reveal a rich high field magnetic phase diagram, which closely resembles the observations made for URuSi2 [4]

  • Poster
    RHMF 09 (Research in High Magnetic Fields 2009), 22.-25.07.2009, Dresden, Deutschland

Permalink: https://www.hzdr.de/publications/Publ-13050
Publ.-Id: 13050