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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64702完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳政維(Jeng-Wei Chen) | |
| dc.contributor.author | Ding-En Lin | en |
| dc.contributor.author | 林鼎恩 | zh_TW |
| dc.date.accessioned | 2021-06-16T22:57:40Z | - |
| dc.date.available | 2012-08-10 | |
| dc.date.copyright | 2012-08-10 | |
| dc.date.issued | 2012 | |
| dc.date.submitted | 2012-08-09 | |
| dc.identifier.citation | 1. E.V. Sampathkumaran, S. Majumdar. , W. Schneider, S. L. Molodtsov, C. Laubschat, Physica B 312-313, 152 (2002).
2. S. Baran, J. Leciejewicz, M. Slaski, A. Szytula, B. Penc, Y. Ding, N. Stusser, J. Alloys Compounds 256, L18 (1997). 3. T. Nishioka, Y. Tabata, T. Taniguchi, Y. Miyako, J. Phys. Soc. Jpn. 69, 1012 (2000). 4. D.P. Rojas, L.C.J. Pereira, E.B. Lopes, J.C. Waerenborgh, L.M. da Silva, F.G. Gandra, A.N. Medina, J. Alloys Compounds 432, 34 (2007). 5. D. Huo, J. Sakurai, T. Kuwai, Y. Isikawa, Phys. Rev. B 64, 224405 (2001). 6. E Gratz, A S Markosyan, J. Phys. Cond 13, 385 (2001) 7. J.A. Mydosh, Spin Glasses: An Experimental Introduction (Taylor & Francis, London, 1993). 8. J. Kondo, Prog. Theor. Phys. 32, 37 (1964). 72 9. A.C. Hewson, The Kondo Problem to Heavy Fermions (Cambridge University Press, 1993). 10. I. Das and E. V. Sampathkumaran, Phys. Rev. B 49, 6 (1994). 11. J de la Venta, Ali C Basaran, T Grant, A J S Machado, M R Suchomel, R T Weber, Z Fisk and Ivan K Schuller, Supercond. Sci. Technol. 24 075017 (2011). 12. A. Iandelli, A. Palensona, J. Less. Comm. Metals 25, 333 (1971). 13. C. Kittel, Interoduction to Solid State Physics 6th ed (John Wiley & Sons,1986). 14. A.V. Morozkin, Jinlei Yao and Y. Mozharivskyj, Journal of Solid State Chemistry (2012). 15. M. Imai, T. Aoyagi, T. Kimura, Intermetallics 16, 96 (2008). 16. A.Y. Takeuchi, S.F. da Cunha, J. Alloys Compounds 226, 126 (1995). 17. P. Svoboda. M. Divis, E. Gratz, R. Cerny, and L. Dobiasova, Phys. Stat. Sol. A 123, K149 (1991). 18. A. M. Stewart, Phys. Rev. B 6, 1985 (1972). 19. I. Lupsa, T. Petrisor, Modern Physics Letters B, 23, 1345 (2008). 20. H. Oesterreicher, J. Phys. Chem. Solids, 34 1267 (1973). 21. H. Oesterreicher, W. E. Wallace, J. Less. Comm. Metal, 13, 91 (1967). | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64702 | - |
| dc.description.abstract | The crystal structure, electrical resistivity (ρ) and magnetic susceptibility (χdc of the R2CoAl3 (R = Y and rare earth element) compounds are investigated. Powder X-ray diffraction patterns reveal that all the samples crystallize in the cubic MgCu2 type structure except Ho and Er and lattice parameters are found to decrease monotonically from 8.1A to 7.7 A with increasing the atomic number of R. Structure transforms from cubic to hexagonal in Ho and Er sample The ρ(T) curve of La2CoAl3 drops to zero at 6 K and the diamagnetic behavior observed in χdc(T) curve confirms the presence of bulk superconductivity with Tc=6K and ΔTc=1K. Above the superconducting transition temperature the ρ(T) curve exhibit a metallic behavior. The ρ(T) curves of R2CoAl3 (R =Sm, Tb, Ho, and Er ) compounds shows the etallic behavior with local minima at low temperature. The χdc(T) vurves for all samples studied follow the Curie-Weiss behavior for T > 150 K except Sm, with the obtained value of effective moments μeff slightly larger than the moment of the corresponding R3+ ions. The occurrence of anomaly in the χdc(T) curves and a drop off in the ρ(T) curve at the corresponding temperatures indicate that antiferromagnetic transition occurs in R2CoAl3 (R = Ce, Pr and Nd) and ferromagnetic transition in Sm2CoAl3 and Tb2CoAl3 compounds. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T22:57:40Z (GMT). No. of bitstreams: 1 ntu-101-R99222068-1.pdf: 4240845 bytes, checksum: 6a6e61a40cf8c8b6c2d05ae355f805bf (MD5) Previous issue date: 2012 | en |
| dc.description.tableofcontents | 致謝.......................................................i
Abstract .................................................ii Table of content.........................................iii List of Figures .......................................... v List of Tables...........................................vii Chapter 1 Introduction ................................... 1 a. Overview .............................................. 1 b. Spin-glass behavior ................................... 5 c. Kondo effect .......................................... 7 d. Superconductivity ..................................... 9 Chapter 2 Experimental Detail............................ 11 a. Sample preparation ................................... 11 b. X-ray diffraction..................................... 13 c. Electrical resistivity measurement ................... 14 d. Susceptibility and magnetization measurement.......... 15 e. 3He cryostat.......................................... 16 Chapter 3 Theoretical Model ............................. 19 a. The electrical resistivity of metals ................. 19 b. Magnetic susceptibility .............................. 23 Chapter 4 Results and discussions ....................... 25 a. Y2CoAl3 .............................................. 25 b. La2CoAl3 ............................................. 30 c. Ce2CoAl3...............................................34 d. Pr2CoAl3...............................................38 e. Nd2CoAl3 ..............................................42 f. Sm2CoAl3 ..............................................43 g. Gd2CoAl3 ..............................................51 h. Tb2CoAl3...............................................55 i. Ho2CoAl3 ..............................................59 j. Er2CoAl3 ..............................................63 Chapter 5 Summary . ......................................67 a. Crystallographic structures ...........................67 b. Electrical resistivity ................................69 c. Magnetic susceptibility................................70 References. ..............................................71 | |
| dc.language.iso | en | |
| dc.subject | 超導現象 | zh_TW |
| dc.subject | 近藤效應 | zh_TW |
| dc.subject | 自旋玻璃 | zh_TW |
| dc.subject | superconductivity | en |
| dc.subject | Kondo effect | en |
| dc.subject | spin galss | en |
| dc.title | R2CoAl3(R=Y and 鑭系元素)三元稀土化合物之物性研究 | zh_TW |
| dc.title | Structure, Electrical and Magnetic Properties of R2CoAl3
(R = Y and rare-earth ions) compounds | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 100-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 林昭吟,陳洋元 | |
| dc.subject.keyword | 超導現象,近藤效應,自旋玻璃, | zh_TW |
| dc.subject.keyword | superconductivity,Kondo effect,spin galss, | en |
| dc.relation.page | 73 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2012-08-09 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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