Evidence of electromagnetic absorption by collective modes in the heavy fermion superconductor UBe(13).

ar X iv : c on d - m at / 0 30 74 20 17 J ul 2 00 3 Non - Fermi liquid normal state of the Heavy Fermion superconductor UBe 13

Optical conductivity of the heavy fermion superconductor CeCoIn5

The electrodynamic response of the heavy fermion compound CeCoIn5 is studied via infrared spectroscopy. Below 100 K the high temperature Drude-like conductivity evolves into two distinct components. At low energies a narrow mode is observed which is characteristic of the response of heavy quasiparticles. At higher energies a gap structure emerges with 2D;600 cm ~75 meV!. Examination of the fine...

Observation of an unusual magnetic anomaly in the superconducting mixed state of heavy-fermion compound UBe13 by precise dc magnetization measurements.

We have performed precise dc magnetization measurements for a single crystal of UBe(13) down to 0.14 K, up to 80 kOe. We observed a magnetic anomaly in the superconducting (SC) mixed state at a field, named H(Mag)(*) (~ 26 kOe, at 0.14 K), implying that UBe(13) has a magnetically unusual SC state. We studied the magnetization curves of UBe(13), assuming that the H(Mag)(*) anomaly originates fro...

X-ray-absorption spectroscopy study of the heavy-fermion superconductor PrOs4Sb12

X-ray-absorption fine-structure ~XAFS! measurements have been carried out at the Pr L III and Os L III edges on the Pr-based heavy-fermion superconductor PrOs4Sb12 . The x-ray absorption near-edge structure results suggest that the Pr valence is very close to 31 with at most a small amount of Pr @vPr;3.019(3)# , while Os is close to metallic in this material. The extended XAFS results show that...

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  Two decades ago the epoch making discovery of high Tc cuprate superconductivity by Bednorz and Müller shocked the world’s superconductivity community. However, already in 1979 and 1980, the first heavy fermion superconductor CeCu2Si2 and organic superconductor (TMTSF)2PF6 have been discovered respectively. Also we know now that all these superconductors are unconventional and nodal. Further t...