New Quantum-Critical-Point related effects in Ce lattice systems;

Article

Summary *

Anomalous physical properties related to quantum critical points are investigated in Ce-systems whose magnetic phase boundaries, TN;Cðx; pÞ; can be traced for at least one decade of temperature. A change from the usual negative curvature to a linear concentration, x, dependence of TN;CðxÞ is observed at x
Xxcr=2 (xcr being the critical concentration). Within the x
oxoxcr region, the usual specific heat temperature dependence Cm=T / Ln ð1=TÞ develops above TN;C; while a nearly constant value of Cm=T maximum is observed besides a scaling of Cm=TðTÞ with DT ¼ T  TN;C: Coincidentally, a significant increase of the zero-point entropy S0ðxÞð¼ RLn 2  Smðx; TÞÞ occurs. Dimensionality and dynamics of the spin fluctuations can be analyzed computing the internal energy and entropy for TXTN and AC-susceptibility results. Consequences for the free-energy evolution within this region and implications of the S0ðxÞ increase are discussed. Information provided by the agent in SIGEVA