Magetoresistance of RuO_2-based resistance thermometers below 0.3 K.pdfVIP

下载本文档

5
0
约 6页
2017-04-13 发布于江苏
举报
版权申诉

Magetoresistance of RuO_2-based resistance thermometers below 0.3 K.pdf

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

Magetoresistance of RuO_2-based resistance thermometers below 0.3 K

a r X i v : c o n d - m a t / 0 0 0 7 3 9 9 v 3 [ c o n d - m a t .d i s - n n ] 1 3 A u g 2 0 0 1 Magnetoresistance of RuO2-based resistance thermometers below 0.3 K Michio Watanabe,1? Masashi Morishita,2 and Youiti Ootuka2 1Dept. Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan 2Institute of Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan (Received 11 July 2000; accepted 26 March 2001) We have determined the magnetoresistance of RuO2-based resistors (Scientific Instruments (SI) RO-600) between 0.05 and 0.3 K in magnetic fields up to 8 T. The magnetoresistance is negative around 0.5 T and then becomes positive at larger fields. The magnitude of the negative magnetore- sistance increases rapidly as the temperature is lowered, while that of the positive magnetoresistance has smaller temperature dependence. We have also examined the temperature dependence of the re- sistance below 50 mK in zero magnetic field. It is described in the context of variable-range-hopping (VRH) conduction down to 15 mK. Hence, the resistors can be used as thermometers down to at least 15 mK. I. INTRODUCTION As promising low-temperature thermometers, RuO2- based thick-film chip resistors have been introduced (for example [1]). The advantages of such resistors are repro- ducibility and reasonably small magnetoresistance. In order to implement the accuracy of the thermometry in magnetic fields, a lot of works has been devoted to the magnetoresistance measurements of RuO2-based resis- tors [2–11]. Unfortunately, the magnetoresistance seems to be dependent on the detail of the manufacturing pro- cess. In the case of commercial resisters, results vary even in the sign of the magnetoresistance depending upon the manufacturing company as summarized in [8, Table 1]. Recently RuO2-based resistors produced by Scientific Instruments Inc. (SI) are used in many laboratories. However, there is no substantial publication on their ma