用固相反应法制备了La0.3Ca0.7Mn1-xWxO3(x=0.04,0.08,0.12)多晶材料,测量了样品的p～T曲线及ESR谱,对ESR谱的归一化强度和线宽进行了研究.结果表明:当x≤0.08时,ρ～T曲线出现弯折点,体系出现电荷有序(CO)相,体系随温度降低发生顺磁(PM)-电荷有序(CO)-反铁磁(AFM)变化;当x=0.12时,ρ～T曲线没有出现弯折点,CO相融化,自旋序主要是顺磁(PM),但存在CO相的残留.x≤0.08样品的线宽在高于Tco的温区几乎不随温度变化,体系处在顺磁态,铁磁关联较弱;在低于Tco的温区,电子的局域化程度增强,线宽随温度的降低而增加.
参考文献
| [1] | A.Venimadhav;M.S.Hedge;V.Prasad et al.[J].Journal of Physics,2000,33D:2921. |
| [2] | N Kida;M Tonouchi .[J].Applied Physics Letters,2001,78:4115. |
| [3] | S Mori;C H Chen;S-W Cheong .[J].Nuture,1998,392:473. |
| [4] | M R Ibarra;J M Teresa;J Blasco et al.[J].J Phys Rev,1997,56B:8252. |
| [5] | M T Fernandez-Diaz;J L Martinez;J M Alonso et al.[J].PHYSICAL REVIEW,2003,59B:1277. |
| [6] | A P Ramarez;P Schiffer;S-W Cheong et al.[J].Physical Review Letters,1996,76:3188. |
| [7] | B Raveau;A Maignan;C Martin .[J].Journal of Solid State Chemistry,1997,130:162. |
| [8] | P V Vanitha;A Arulraj;A R Raju et al.[J].Acad C R Sci Ser Ⅱ b:Mec Phys Chim Astron,1999,2:595. |
| [9] | P V Vanitha;R S Singh;S Natarajan et al.[J].Journal of Solid State Chemistry,1998,137:365. |
| [10] | A Maignan;F Damay;A Bamabe et al.[J].Philos Trans R Soc London Ser A,1998,356:1635. |
| [11] | A Barnabe;M Heivieu;A Maignan et al.[J].Journal of Applied Physics,1998,84:5506. |
| [12] | 刘宁,严国清,蔡之让,郭焕银,彭振生,曲哲,张裕恒.La0.3Ca0.7Mn1-xWxO3体系的电荷序和自旋序[J].科学通报,2005(18):1942-1947. |
| [13] | 彭振生,刘宁,徐素军,童伟.Er低掺杂（0.0≤x≤0.20）对La0.67Sr0.33MnO3输运行为的影响[J].低温物理学报,2004(02):120-125. |
| [14] | W H Tian;W T Zheng;Z D Zhao et al.[J].Chemical Physics Letters,2005,401:585. |
| [15] | J P Joshi;R Gupta;A K Sood et al.[J].Physical Review B:Condensed Matter,2001,65:024410. |
| [16] | R Gupta;J P Joshi;S V Bhat et al.[J].Journal of Physics:Condensed Matter,2000,12:6919. |
| [17] | E O Wollan;W C Koehler .[J].Physical Review,1955,100:545. |
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%