The Study of Spin Gap Effect of the Eu-Ba-Cu-O Sytem
碩士 === 淡江大學 === 物理學系 === 86 === Spin gap effect on bulk system of Eu/sub 1+x/Ba/sub 2-x/Cu/sub 3/ O/sub delta/(x=0~0.4) were achieved by, rather than adjusting the oxygen deficiency,alternatively substituting Eu/sub 3+/ for Ba/sub 2+/ to co...
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ndltd-TW-086TKU011980102015-10-13T17:34:45Z http://ndltd.ncl.edu.tw/handle/36222637309070066850 The Study of Spin Gap Effect of the Eu-Ba-Cu-O Sytem 銪鋇銅氧系超導體之自旋能隙研究 HSIAO, POWEN 蕭博文 碩士 淡江大學 物理學系 86 Spin gap effect on bulk system of Eu/sub 1+x/Ba/sub 2-x/Cu/sub 3/ O/sub delta/(x=0~0.4) were achieved by, rather than adjusting the oxygen deficiency,alternatively substituting Eu/sub 3+/ for Ba/sub 2+/ to control hole number.But thesamples were determined to be of impure phases, and the underdoping states under investigation were assumed to be of saturated oxygen concentration. In this study pure phase samples was first obtained through adjusting the molar number of Cu in the preparation process, where X-raypower diffraction analysis and EDAX were used to monitor the status of thesample. The relations between annealing time and oxygen concentration for samples of various underdoping state was found by weight measuring method, where the annealing time decreases from twenty -five days to three days as the doping concentration increases. However that spin gap temperature for most samples were determined to be above 230K was not predicted by RVB theory. This discrepancy was due possibly to the inhomogeneity of the bulk samplerevealed by magnetic measurements. Chien F. Z. 錢凡之 1998 學位論文 ; thesis 80 zh-TW |
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碩士 === 淡江大學 === 物理學系 === 86 === Spin gap effect on bulk system of Eu/sub 1+x/Ba/sub 2-x/Cu/sub
3/ O/sub delta/(x=0~0.4) were achieved by, rather than adjusting
the oxygen deficiency,alternatively substituting Eu/sub 3+/ for
Ba/sub 2+/ to control hole number.But thesamples were determined
to be of impure phases, and the underdoping states under
investigation were assumed to be of saturated oxygen
concentration. In this study pure phase samples was first
obtained through adjusting the molar number of Cu in the
preparation process, where X-raypower diffraction analysis and
EDAX were used to monitor the status of thesample. The relations
between annealing time and oxygen concentration for samples of
various underdoping state was found by weight measuring method,
where the annealing time decreases from twenty -five days to
three days as the doping concentration increases. However that
spin gap temperature for most samples were determined to be
above 230K was not predicted by RVB theory. This discrepancy was
due possibly to the inhomogeneity of the bulk samplerevealed by
magnetic measurements.
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author2 |
Chien F. Z. |
author_facet |
Chien F. Z. HSIAO, POWEN 蕭博文 |
author |
HSIAO, POWEN 蕭博文 |
spellingShingle |
HSIAO, POWEN 蕭博文 The Study of Spin Gap Effect of the Eu-Ba-Cu-O Sytem |
author_sort |
HSIAO, POWEN |
title |
The Study of Spin Gap Effect of the Eu-Ba-Cu-O Sytem |
title_short |
The Study of Spin Gap Effect of the Eu-Ba-Cu-O Sytem |
title_full |
The Study of Spin Gap Effect of the Eu-Ba-Cu-O Sytem |
title_fullStr |
The Study of Spin Gap Effect of the Eu-Ba-Cu-O Sytem |
title_full_unstemmed |
The Study of Spin Gap Effect of the Eu-Ba-Cu-O Sytem |
title_sort |
study of spin gap effect of the eu-ba-cu-o sytem |
publishDate |
1998 |
url |
http://ndltd.ncl.edu.tw/handle/36222637309070066850 |
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