Anomalies in ultrasonic velocity and attenuation in Nd<sub>0.67sub>Sr<sub>0.33sub>MnO<sub>3sub> perovskite

详细信息	查看全文 | 推荐本文 |

• 作者：Rajendran ; V. ; Kumaran ; S. Muthu ; Sivasubramanian ; V. ; Jayakumar ; T. ; Raj ; Baldev
• 关键词：62.65.+k ; 63.90.+t ; 71.38.&minus ; k ; 75.30.Kz ; Nd<sub>0.67sub>Sr<sub>0.33sub>MnO<sub>3sub> perovskite ; Ultrasonic velocity ; Attenuation ; Ferromagnetic phase transition temperature ; Charge ordering temperature ; Electron&ndash ; phonon interaction ; Spin&
• 刊名：Physica B
• 出版年：2003
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：August, 2003
• 卷：336
• 期：3-4
• 页码：261-266
• 文件大小：191 K

摘要

Temperature dependence of ultrasonic and electrical properties of Nd<sub>0.67sub>Sr<sub>0.33sub>MnO<sub>3sub> perovskite has been investigated based on the proposed phase diagram employing ultrasonic parameters. We demonstrate the ferromagnetic state below ferromagnetic phase transition temperature T<sub>Csub> (s/glyphs/BQ4.GIF>234K) and a transition from charge disordered ferromagnetic (FM) metal to charge ordered antiferromagnetic (AFM) insulating state around charge ordering temperature T<sub>COsub> (s/glyphs/BQ4.GIF>194K). The existence of spin&ndash;phonon interaction caused by a linear magnetostriction and electron&ndash;phonon interaction originating from the Jahn&ndash;Teller effect have been discussed based on the observed anomalies in ultrasonic parameters, which arise from the competition between ferromagnetic and antiferromagnetic interactions.