Pressure Dependence of Superconductivity of Iron Chalcogenides

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Presentation transcript:

Pressure Dependence of Superconductivity of Iron Chalcogenides Shimizu group M1 Hidenori Fujita

Contents Introduction My experiment Conclusion & Future work High pressure Superconductor KxFe2-ySe2 My experiment High pressure experiment Sample & Data Conclusion & Future work

introduction High Pressure 1 GPa = 10,000 atm 　≅ 100,000 m (water depth) 360 GPa ≅ center of the earth http://www.jsanet.or.jp/qanda/text/q1_03.html 100,000m http://www.spring8.or.jp/ja/news_publications/research_highlights/no_57/

introduction High Pressure Pressure can change crystal structure atomic distance, structure type ….. etc. Molecule Insulator pressurization monatomic metal (金属単原子)

Introduction Superconductivity (SC)超伝導 Zero resistance Meissner effect Emerge at low temperature Application Superconducting magnet SQUID Transmission line …. etc. http://www.kek.jp/ja/NewsRoom/Highlights/20110512133324/ http://www.st-h.ed.jp/oldpage/club-page/kaken/physics/katudou/tyoudenndou.html

Introduction Pressure dependence of SC Transition temperature can change with pressure Journal of the Physical Society of Japan Vol. 78, No. 6, June, 2009, 063705 http://www.jst.go.jp/pr/announce/20080424/

Introduction History of Tc Highest ≅ 170 K (under high pressure in HgBa2Ca2Cu3O8+δ(Hg-1223) ) Iron based superconductor Tc < 60 K Chalcogenide & pnictide

Introduction KxFe2-ySe2 Tc of KxFe2-ySe2 decrease by applying pressure SC phase re-emerge at higher pressure (at 11GPa) doi:10.1038/nature10813

Motivation Research…. difference of sample (amount of K) Previous research : K0.8Fe1.7Se2 behavior at high pressure

My experiment High pressure experiment Apply pressure with Diamond Anvil Cell

My experiment High pressure experiment How to measure the electrical resistance

My experiment Sample 1 Property and condition K0.66Fe1.78Se2 Run 1 (amount of K is few) Run 2

My experiment Sample 1 Results Run 1 Run 2

My experiment Sample 1 Results 10GPa~の拡大 今回の測定では転移温度の減少は確認できましたがSC2-phaseの確認はできませんでした。こちらは10GPa以降の電気抵抗の様子ですが、先行研究のようなドロップは見られていません。

(original composition) My experiment Sample 2 Property and condition K0.8Fe2Se2 (original composition)

My experiment Sample 2 Results

My experiment Sample 1 Results

Sample 1 Sample 2

Conclusion & Future work SC1-phase remains SC2-phase didn’t appear Future work Change the amount of Fe Continue to research at high pressure

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