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320 Handbook on the Physics and Chemistry of Rare Earths n≈1 Tpg SC CeCoIn5 n = 1.5 ± 0.1 TFL n=2 3 2 1 012345 AFM NFL PG SC FL 0 Pc0 P(GPa) Upper panel: Temperature–pressure phase diagram of CeCoIn5 determined by electri- cal resistivity. A QCP is expected at PQPT1⁄43.5GPa but it emerges from a FL state instead of an NFL. Lower panel: Proposed schematic of various T–P phases. Note that the AFM only appears at negative pressures and the speculations of a pseudogap. According to Sidorov, V.A., Nicklas, M., Pagliuso, P.G., Sarrao, J.L., Bang, Y., Balatsky, A.V., Thompson, J.D., 2002. Super- conductivity and quantum criticality in CeCoIn5. Phys. Rev. Lett. 89 (15), 157004. with the antiferromagnetic order, suggesting possible inhomogeneous phases. In order to probe the AFM and SC on a local scale, NMR was employed to study the extent of these phases (Urbano et al., 2007). Here, the results are interpreted in terms of local droplets of magnetism surrounding the Cd impu- rities. With a sufficient concentration of droplets, that is, cadmium, a percola- tive transition occurs toward true long-range AFM within the coexistent SC matrix. Further details concerning the dangers of disorder caused by impurity doping is discussed by Seo et al. (2014). Currently their droplet model is probed by nuclear quadrupole resonance (NQR) on a local scale. A cartoon illustration of the pressure dependence of the AFM droplets is shown in Fig. 15. This nucleation interpretation emphasizes the annulling effect of dis- ordered ligand doping on the quantum criticality. For instead of a homoge- neous QPT, we now create a freezing of magnetic fluctuations generating an inhomogeneous glassy ground state. In summary: the doped system seems to display not a proper QPT but rather a frozen quantum glass. Another compound, CeRhIn5, is antiferromagnetic with TN % 3.8 K as determined by C/T, w, and r measurements. Neutron scattering has detected FIG. 14 P P* T T(K)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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