A platform for research: civil engineering, architecture and urbanism
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Abstract The proximity of heavy fermion systems to a spin-density wave instability is studied by modeling the magnetic-field dependence of the low-temperature specific heat of CeAl 3 using a ‘temperature-dependent Kondo temperature’ approach. Evidence is extracted for the existence of two temperature scales, of which the lower one, dominating the temperature dependence below 0.5°K is associated with spin density wave fluctuations. The properties of the critical point at zero temperature that may exist for systems that can undergo a spin-density wave-Kondo lattice transition as a function of externally driven parameters such as field or pressure, are discussed in terms of a phenomenological field theory for coupling of slave boson phase fluctuations with paramagnons. We suggest that the conservation of an ‘isotopic charge’ leads to a relevant operator that makes a Gaussian fixed point unstable for any space dimension.
Abstract The proximity of heavy fermion systems to a spin-density wave instability is studied by modeling the magnetic-field dependence of the low-temperature specific heat of CeAl 3 using a ‘temperature-dependent Kondo temperature’ approach. Evidence is extracted for the existence of two temperature scales, of which the lower one, dominating the temperature dependence below 0.5°K is associated with spin density wave fluctuations. The properties of the critical point at zero temperature that may exist for systems that can undergo a spin-density wave-Kondo lattice transition as a function of externally driven parameters such as field or pressure, are discussed in terms of a phenomenological field theory for coupling of slave boson phase fluctuations with paramagnons. We suggest that the conservation of an ‘isotopic charge’ leads to a relevant operator that makes a Gaussian fixed point unstable for any space dimension.
Phase Diagram of the Kondo Lattice
Doniach, S. (author)
1987-01-01
7 pages
Article/Chapter (Book)
Electronic Resource
English
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