Anomalous scaling behavior of the dynamical spin susceptibility of Ce0.925La0.075Ru2Si2 | |
Article | |
关键词: QUANTUM-CRITICAL-POINT; INELASTIC NEUTRON-SCATTERING; FERMION COMPOUND CERU2SI2; MAGNETIC INSTABILITY; TRANSPORT-PROPERTIES; LIQUID BEHAVIOR; HEAVY-ELECTRON; FLUCTUATIONS; DEPENDENCE; PRESSURE; | |
DOI : 10.1103/PhysRevB.70.174401 | |
来源: SCIE |
【 摘 要 】
Inelastic neutron scattering measurements have been performed on single crystals of the heavy-fermion compound Ce0.925La0.075Ru2Si2 in broad energy [0.1,9.5 meV] and temperature [40 mK,294 K] ranges in order to address the question of scaling behavior of the dynamical spin susceptibility at the quantum critical point of an itinerant magnetic system. For two wave vectors Q corresponding to uncorrelated and antiferromagnetically correlated spin fluctuations, it is found that the dynamical spin susceptibility chi(')(Q,E,T) is independent of temperature below a cutoff temperature T-Q: the spin fluctuation amplitude saturates at low temperatures contrarily to its expected divergence at a quantum critical point. Above T-Q, a Q-dependent scaling behavior of the form Tchi(')(Q,E,T)=C(Q)f[E/(a(Q)T(Q)(beta))] with beta(Q)<1 is obtained. This scaling does not enter the general framework of quantum phase transition theories, since it is obtained in a high-temperature range, where Kondo spin fluctuations depend strongly on temperature.
【 授权许可】
Free