CINECA IRIS Institutional Research Information System
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
EnglishCu-63,Cu-65 NQR-NMR relaxation measurements in CeCu6-xAux for x=0, x=0.1, and x=0.8 are used to derive insights on temperature (T) and magnetic-field (H) dependences of the spin dynamics around the quantum critical point (QCP). The relaxation rate 2W is related to the k integrated, low energy, generalized susceptibility chi(k,omega,H,T-->0). For x=0 a Fermi-liquid behavior is detected, while for x=0.8 the temperature dependence of 2W is the one expected for a nearly antiferromagnetic metal ordering at T-N=2.2 K. Instead, for x=0.1, around the QCP, a response function of the form suggested by neutron scattering, namely of two-dimensional character with anomalous exponent and (omega/T) scaling, is found to explain the main experimental findings. An effect is observed in the low-temperature range for Hgreater than or similar to1 T, with a crossover to a gapped phase for the spin excitations at a field-dependent temperature.
Scheda prodotto non validato
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo
| Titolo: | Dynamical susceptibility and magnetic field effect at the quantum criticality in CeCu6-xAux from Cu NQR-NMR relaxation | |
| Autori: | ||
| Data di pubblicazione: | 2003 | |
| Rivista: | ||
| Abstract: | Cu-63,Cu-65 NQR-NMR relaxation measurements in CeCu6-xAux for x=0, x=0.1, and x=0.8 are used to derive insights on temperature (T) and magnetic-field (H) dependences of the spin dynamics around the quantum critical point (QCP). The relaxation rate 2W is related to the k integrated, low energy, generalized susceptibility chi(k,omega,H,T-->0). For x=0 a Fermi-liquid behavior is detected, while for x=0.8 the temperature dependence of 2W is the one expected for a nearly antiferromagnetic metal ordering at T-N=2.2 K. Instead, for x=0.1, around the QCP, a response function of the form suggested by neutron scattering, namely of two-dimensional character with anomalous exponent and (omega/T) scaling, is found to explain the main experimental findings. An effect is observed in the low-temperature range for Hgreater than or similar to1 T, with a crossover to a gapped phase for the spin excitations at a field-dependent temperature. | |
| Handle: | http://hdl.handle.net/11571/106022 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
File in questo prodotto:
Copyright © 2021