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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: f-Electron Systems and Heavy Fermions

TT 38.5: Vortrag

Mittwoch, 3. April 2019, 10:45–11:00, H23

Switching the propagation vector of the hidden-order phase in Ce3Pd20Si6 with a magnetic field — •Pavlo Y. Portnichenko1, Stanislav E. Nikitin2, Andrey Prokofiev3, Silke Paschen3, Jean-Michel Mignot4, Jacques Ollivier5, Andrey Podlesnyak6, Siqin Meng7,8, Zhilun Lu8, and Dmytro S. Inosov11IFMP, TU Dresden, Germany — 2MPI-CPfS, Dresden, Germany — 3Vienna Univ. of Technology, Austria — 4LLB, France — 5ILL, France — 6SNS, Oak Ridge, USA — 7CIAE, Beijing, China — 8HZB, Berlin, Germany

Hidden-order phases that occur in a number of correlated f-electron systems are among the most elusive states of electronic matter. The heavy-fermion compound Ce3Pd20Si6 exhibits magnetically hidden order that occurs at subkelvin temperatures, known as phase II. Additionally, only in a magnetic field applied parallel to the [001] cubic axis, another field-induced phase II was observed in magnetization measurements, yet the nature of the II-II phase transition has remained a mystery. Here we use inelastic neutron scattering to demonstrate that this transition is associated with a switching in the propagation vector of the antiferroquadrupolar order from (111) to (100) with a simultaneous change in the type of the ordered quadrupole from O20 to Oxy. Despite the absence of magnetic Bragg scattering in the phase II, its propagation vector was revealed by the location of an intense soft mode in the excitation spectrum along the (100) direction, orthogonal to the applied field. Our experiment also reveals collective excitations in the field-polarized paramagnetic phase, after phase II is suppressed.

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