Nuclear Magnetic Relaxation around the Magnetic Instabilities in Metals

Unconventional superconductivity in PuCoGa5

“…Furthermore, the temperature dependence of T 1 21 in the normal state of PuCoGa 5 is qualitatively different than that observed in conventional BCS superconductors (see Fig. 3b), but has been predicted for a relaxation rate dominated by antiferromagnetic spin fluctuations 16 . Further, the normalized relaxation rates of PuCoGa 5 , high-T c YBa 2 Cu 3 O 7 and CeCoIn 5 scale onto a common curve as a function of the dimensionless parameter T/T c .…”

“…Because of its comparatively simple structure it is often employed as a model system for excitonic (delocalization) effects in photosynthesis research 13 . However, it is not clear to what extent individual spectral features, such as those in the linear FMO absorption spectrum, are caused by differences in site energies (arising from the interaction of the BChl pigments with their local protein environment) or by energy splitting from excitonic coupling (that is, pigment-pigment interaction) [14][15][16] . With twodimensional femtosecond spectroscopy, couplings can be made visible directly.…”

Heavy-fermion formation at the metal-to-insulator transition inGd1−xSrxHeinrich1, Nidda2, Fritsch3 et al. 2001Phys. Rev. B

“…An appropriate expression for the dynamic susceptibility, which takes the itinerant character of the Ti electrons into account, is given by Ishigaki and Moriya [15,16], who developed a theoretical description of nuclear magnetic relaxation around the magnetic instabilities in metals. Their results were also used to explain the NMR relaxation rate in Ca 1−x Sr x RuO 3 [4].…”

“…The reduced inverse 3d susceptibility y is given by an implicit integral equation [15], which has to be iterated numerically. It is characterized by two parameters y 0 and y 1 , respectively: y 0 is proportional to the inverse static susceptibility at zero temperature and therefore vanishes at the magnetic instability.…”

Muon spin relaxation and susceptibility measurements of an itinerant-electron system Sr1−xCaxRuOGat-Malureanu1, Carlo2, Goko3 et al. 2011Phys. Rev. B21090View full textAdd to dashboardCite

“…ates from the linear trend observed for the other ferromagnetic samples. Ishigaki and Moriya 53 showed that T 1 diverges as T −1/3 at the magnetic instability in metals. Among the ferromagnetic systems in the present study, the x = 0.7 system is the closest to the magnetic crossover.…”