ULTRASONIC ANOMALY AT NEEL POINT AT T = 2.23 K IN GDBA2CU3O6.4 SINGLE-CRYSTALстатья
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 19 февраля 2018 г.
Аннотация:Results of ultrasound velocity measurements for GdBa2Cu3O7−x single crystal (x=0.6) at 2–300 K are presented. It is found that this system is undergoing the antiferromagnetic (AF) ordering of the rare earth (RE) ions Gd at TN = 2.23 K. This transition corresponds to the relative variation of the 10 longitudinal velocity ΔS1/S1∼2–3% and sound attenuation increase about ten times. We suppose that the AF ordering of Gd ions is due to the superexchange (SE) between Gd3+ ions via oxygen ones. The second anomaly detected at ∼200 K appears as a kink on temperature dependence of ultrasound velocity and as a footstep on attenuation curve.