Order parameter of the mysterious high field phase in Ce3Pd20Si6
Heavy-fermion metal Ce3Pd20Si6 exhibits an antiferroquadrupolar phase and an antiferromagnetic phase. According to the phase diagram, the boundary between the PM and a hidden-order phase phase II, becomes strongly anisotropic in magnetic fields. We have previously identified phase II as a slightly incommensurate AFQ order by the appearance of field-induced magnetic satellites near the (111) Bragg peak. Despite the absence of magnetic Bragg scattering in phase II`, its ordering vector was revealed later by the location of an intense magnetic mode. The question remains whether the phase II` exists only for fields applied along [001]. We did torque magnetometry measurement in a rotating magnetic field at the NHMFL. We discovered that the phase II` persists for almost all field directions. A new high-field phase transition for field directions close to [112] was also found. In this proposal we suggest to look for the order parameter as well as low-energy magnetic excitations as a function of the applied magnetic field along [112] using ThALES, which can give us valuable clues to understanding the nature of the recently found transition.
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PORTNICHENKO Pavlo; BOEHM Martin; Dmytro Inosov; MAZZA Federico and STEFFENS Paul. (2021). Order parameter of the mysterious high field phase in Ce3Pd20Si6. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-03-1743
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