系统地测量了La0.9Na0.1MnO3单相陶瓷样品的电阻、磁化率、超声声速和衰减随温度的变化关系,发现在245K附近体系发生顺磁绝缘体-铁磁金属相变,同时超声声速出现剧烈的软化现象,其相对变化超过2%.超声衰减也出现一个尖锐的衰减峰.经分析认为这些发生在Curie温度附近的反常超声现象,可能是由自旋-声子和电-声子相互作用共同引起的.
参考文献
| [1] | R Von Helmolt;J Wecker;BHolzapfel;L Schultz,K Samwer .[J].Physical Review Letters,1993,71:2331. |
| [2] | S Jin;T H Tiefel;RRamesh;L. H. Chen .[J].Science,1994,264:413. |
| [3] | K Chahara;T Ohno et al.[J].Applied Physics Letters,1993(63):1990. |
| [4] | E Dagotto;T Hotta;AMoreo .[J].Physics Reports,2001,344:1-153. |
| [5] | C F Zhu;R K Zheng .[J].Journal of Phys:C,1999(11):8505. |
| [6] | C F Zhu;R K Zheng .[J].Physical Review,1999,B59:11169. |
| [7] | H Fujishiro;T Fukase;MIkebe .[J].Journal of the Physical Society of Japan,2001(70):628. |
| [8] | Changfei Zhu;Renkui Zheng;Jinrui Su;Jiang He .Ultrasonic anomalies in La_(0.67)Ca_(0.33)MnO_3 near the Curie temperature[J].Applied physics letters,1999(23):3504-3506. |
| [9] | A P Ramirez;P Schiffer;SWCheong et al.[J].Physical Review Letters,1996,76:3188. |
| [10] | M M Savosta;V A Borodin et al.[J].Physical Review,1998,B57:13379. |
| [11] | S. L. Ye;W. H. Song;J. M. Dai;K. Y. Wang;S. G. Wang;J. J. Du;Y. P. Sun;J. Fang;J. L. Chen;B. J. Gao .Large room-temperature magnetoresistance and phase separation in La_(1-x)Na_(x)MnO_(3) with 0.1≤x≤0.3[J].Journal of Applied Physics,2001(6):2943-2948. |
| [12] | J Vergara;R J Ortega-Hertogs et al.[J].Physical Review,1999,B60:1127. |
| [13] | P M Raccah;J B Goodenough .[J].Physical Review,1967,155:932. |
| [14] | M Rosen .[J].Physical Review,1968,174:504. |
| [15] | M Gottlieb;M Garbuny;CKJones .Physical Acouctic, edited by W.p. Mason and R. N. Thurston[M].New York:Academic Press,1970,VII:2. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%