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...

Full description

Bibliographic Details
Main Authors: HSIAO, POWEN, 蕭博文
Other Authors: Chien F. Z.
Format: Others
Language:zh-TW
Published: 1998
Online Access:http://ndltd.ncl.edu.tw/handle/36222637309070066850
id ndltd-TW-086TKU01198010
record_format oai_dc
spelling 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
collection NDLTD
language zh-TW
format Others
sources NDLTD
description 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.
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
work_keys_str_mv AT hsiaopowen thestudyofspingapeffectoftheeubacuosytem
AT xiāobówén thestudyofspingapeffectoftheeubacuosytem
AT hsiaopowen yǒubèitóngyǎngxìchāodǎotǐzhīzìxuánnéngxìyánjiū
AT xiāobówén yǒubèitóngyǎngxìchāodǎotǐzhīzìxuánnéngxìyánjiū
AT hsiaopowen studyofspingapeffectoftheeubacuosytem
AT xiāobówén studyofspingapeffectoftheeubacuosytem
_version_ 1717781107301154816