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Paper Abstract and Keywords
Presentation 2017-10-04 15:00
Development of Superconducting Tunnel Junction Detector using Hafnium for COBAND experiment
Kenichi Takemasa, Shinhong Kim, Yuji Takeuchi, Takashi Iida, Chisa Asano, Rena Wakasa, Akihiro Kasajima, Hironobu Kanno (Univ. of Tsukuba), Coband experiment collaborator SCE2017-21
Abstract (in Japanese) (See Japanese page) 
(in English) We are developing Superconducting Tunnel Junction detector using hafnium (Hf-STJ) as a far-infrared single photon detector for COsmic BAckground Neutrino Decay search (COBAND) experiment. We have successfully produced a superconductor-insulator-superconductor structure using hafnium. However, it is found to suffer from a large leakage current and needs modification of the Hf-STJ to reduce it. Rough surface of hafnium layer makes defect of insulator. We modified the sputtering condition to make smooth hafnium layer, then we obtained two new sputtering conditions. These conditions have surface RMS of 2.5 nm and 0.93 nm respectively. We have developed two Hf-STJs using these two parameters respectively. We report characteristics of these Hf-STJs.
Keyword (in Japanese) (See Japanese page) 
(in English) Superconducting Tunnel Junction / Neutrino / Hafnium / / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 223, SCE2017-21, pp. 1-4, Oct. 2017.
Paper # SCE2017-21 
Date of Issue 2017-09-27 (SCE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SCE  
Conference Date 2017-10-04 - 2017-10-05 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SCE 
Conference Code 2017-10-SCE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Development of Superconducting Tunnel Junction Detector using Hafnium for COBAND experiment 
Sub Title (in English)  
Keyword(1) Superconducting Tunnel Junction  
Keyword(2) Neutrino  
Keyword(3) Hafnium  
Keyword(4)  
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1st Author's Name Kenichi Takemasa  
1st Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
2nd Author's Name Shinhong Kim  
2nd Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
3rd Author's Name Yuji Takeuchi  
3rd Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
4th Author's Name Takashi Iida  
4th Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
5th Author's Name Chisa Asano  
5th Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
6th Author's Name Rena Wakasa  
6th Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
7th Author's Name Akihiro Kasajima  
7th Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
8th Author's Name Hironobu Kanno  
8th Author's Affiliation University of Tsukuba (Univ. of Tsukuba)
9th Author's Name Coband experiment collaborator  
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Speaker Author-1 
Date Time 2017-10-04 15:00:00 
Presentation Time 25 minutes 
Registration for SCE 
Paper # SCE2017-21 
Volume (vol) vol.117 
Number (no) no.223 
Page pp.1-4 
#Pages 4 
Date of Issue 2017-09-27 (SCE) 

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