Uniaxial strain effects on the superconducting transition in Re-doped Hg-1223 cuprate superconductors
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The effects of uniaxial strain and hydrostatic pressure on Hg0.83Re0.18Ba2Ca2.4Cu3.6O14 [Hg0.83(Re0.18)-1223] were investigated by ac magnetic measurements under stress corresponding to a pressure of 20 GPa at maximum. According to a previous thermal study based on the Ehrenfest relation, in-plane contraction should increase the superconducting transition temperature Tc, whereas out-of-plane contraction should decrease Tc. This suggests that the increase in Tc under hydrostatic-pressure contraction must be smaller than that under in-plane contraction. However, the present uniaxial-strain experiments revealed enhancement of Tc under both in-plane and out-of-plane contraction, and the largest enhancement was observed under hydrostatic-pressure contraction. According to a band calculation, all contraction styles induce hole doping from the HgO blocks to the CuO2 blocks, and hydrostatic-pressure contraction yields the largest hole doping among three contractions. This behavior explains well a series of changes in Tc in the stress region of below 8 GPa. More specifically, under hydrostatic-pressure contraction, Tc exhibited an increase, a decrease, and another increase with increasing pressure, and this multistep change is similar to that observed in Bi-2223-type cuprate superconductors, suggesting that it is necessary to distinguish the effect of strain on the middle CuO2 plane in the three-CuO2-plane package from that on the outer planes.
収録刊行物
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- Physical Review B
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Physical Review B 95 (6), 064503-1-064503-10, 2017-02-07
American Physical Society
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詳細情報 詳細情報について
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- CRID
- 1050564288892124800
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- NII論文ID
- 120006596477
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- NII書誌ID
- AA11187113
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- ISSN
- 24699969
- 24699950
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- HANDLE
- 10228/00007104
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- 本文言語コード
- en
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- 資料種別
- journal article
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