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Magnetic excitations in the unconventional superconductor PrOs$$_4$$Sb$$_{12}$$

非従来型超伝導体PrOs$$_4$$Sb$$_{12}$$における磁気励起

Raymond, S.*; 桑原 慶太郎*; 金子 耕士  

Raymond, S.*; Kuwahara, Keitaro*; Kaneko, Koji

PrOs$$_4$$Sb$$_{12}$$ is a Heavy Fermion (HF) superconductor ($$T_c$$= 1.85 K) that recently attracted a lot of attention due to the realization of strong interplay between electronic, multipolar and lattice properties and the related different possible mechanisms of electron pairing. Above 4 T, a Field Induced Ordered Phase (FIOP) occurs with a primar quadrupolar order parameter. The occurrence of an ordered phase in the vicinity of the superconducting pocket of the (H-T) phase diagram leads to the suggestion that quadrupolar fluctuations participate in the pairing by analogy with the scenario of magnetic mediated pairing for the Ce and U HF compounds. The observed magnetic excitation clearly softens at the wave-vector $$Q$$ = (1, 0, 0), which is the same as the modulation vector of the FIOP and its intensity is smaller than that around the zone center. This results directly evidences that this excitonic behavior is derived mainly from non-magnetic quadrupolar interactions.

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