A step-like increase of the acoustic absorption (Q-1) is found in La2-xSrxCuO4 (x = 0.019, 0.025, 0.032 and 0.064) below the temperature (Tg) at which NQR and ?SR measurements evidenced the formation of a cluster spin-glass (CSG) state. The sharp maxima appearing in the 139La NQR and ?SR relaxation rates indicate the slowing down of antiferromagnetic fluctuations below the measuring frequency (107-108 Hz in those experiments). The acoustic absorption does not appear to be due to the freezing of magnetic fluctuations, for which one expects a narrow peak; rather, it is attributed to the size change of the antiferromagnetically correlated clusters, produced through magnetoelastic coupling by the vibration stress.
Investigation of the cluster spin-glass transition in La2-xSrxCuO4 by means of anelastic spectroscopy
A. Paolone;F. Cordero;M. Ferretti
2000
Abstract
A step-like increase of the acoustic absorption (Q-1) is found in La2-xSrxCuO4 (x = 0.019, 0.025, 0.032 and 0.064) below the temperature (Tg) at which NQR and ?SR measurements evidenced the formation of a cluster spin-glass (CSG) state. The sharp maxima appearing in the 139La NQR and ?SR relaxation rates indicate the slowing down of antiferromagnetic fluctuations below the measuring frequency (107-108 Hz in those experiments). The acoustic absorption does not appear to be due to the freezing of magnetic fluctuations, for which one expects a narrow peak; rather, it is attributed to the size change of the antiferromagnetically correlated clusters, produced through magnetoelastic coupling by the vibration stress.| File | Dimensione | Formato | |
|---|---|---|---|
|
prod_231650-doc_58060.pdf
solo utenti autorizzati
Descrizione: articolo
Tipologia:
Versione Editoriale (PDF)
Licenza:
NON PUBBLICO - Accesso privato/ristretto
Dimensione
687.03 kB
Formato
Adobe PDF
|
687.03 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
