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31.
P. G. Pagliuso N. J. Curro N. O. Moreno M. F. Hundley J. D. Thompson J. L. Sarrao Z. Fisk 《Physica B: Condensed Matter》2002,320(1-4):370-375
We discuss systematic trends in the high-temperature physical properties of the heavy Fermion superconductors (HFS) CeCoIn5 (Tc=2.3 K, γ=300 mJ/molK2), CeIrIn5 (Tc=0.4 K, γ=750 mJ/molK2), and CeRhIn5 (Pc=16 kbar, Tc=2.1 K, γ=400 mJ/molK2) in terms of crystalline-electrical-field effects(CEF). We suggest the possibility that the interplay between the symmetry of the CEF ground-state (or low-T CEF scheme of levels) and the f–s hybridization could generate spin fluctuations relevant to the superconducting pairing mechanism in these materials. This hypothesis may provide insight into the fact that some crystal structures appear to favor superconductivity. Further, CeMIn5 (M=Co, Ir, Rh) appear to be structural relatives of the cubic heavy Fermion superconductor CeIn3, but with much higher Tc's. We argue that structural layering inherent in the tetragonal CeMIn5 crystal structure determines the magnetic and electronic anisotropy responsible for the enhanced Tc's. We also describe similarities and differences between these compounds and the high-Tc cuprates. 相似文献
32.
Movshovich R Jaime M Thompson JD Petrovic C Fisk Z Pagliuso PG Sarrao JL 《Physical review letters》2001,86(22):5152-5155
Low temperature specific heat and thermal conductivity measurements on the ambient pressure heavy fermion superconductors CeIrIn5 and CeCoIn5 reveal power law temperature dependences of these quantities below T(c). The low temperature specific heat in both CeIrIn5 and CeCoIn5 includes T2 terms, consistent with the presence of nodes in the superconducting energy gap. The thermal conductivity data present a T-linear term consistent with the universal limit (CeIrIn5), and a low temperature T3 variation in the clean limit (CeCoIn5), also in accord with prediction for an unconventional superconductor with lines of nodes. 相似文献
33.
Holanda LM Vargas JM Iwamoto W Rettori C Nakatsuji S Kuga K Fisk Z Oseroff SB Pagliuso PG 《Physical review letters》2011,107(2):026402
Electron spin resonance (ESR) can probe conduction electrons (CE) and local moment (LM) spin systems in different materials. A CE spin resonance (CESR) is observed in metallic systems based on light elements or with enhanced Pauli susceptibility. LM ESR can be seen in compounds with paramagnetic ions and localized d or f electrons. Here we report a remarkable and unprecedented ESR signal in the heavy-fermion superconductor β-YbAlB? [S. Nakatsuji et al., Nature Phys. 4, 603 (2008)] which behaves as a CESR at high temperatures and acquires characteristics of the Yb3? LM ESR at low temperature. This dual behavior strikes as an in situ unique observation of the Kondo quasiparticles in a quantum critical regime. The proximity to a quantum critical point may favor the appearance of this dual character of the ESR signal in β-YbAlB?. 相似文献