Dependence of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>and transport properties on the Cu valence in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">HgBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub

Fukuoka, A.; Tokiwa‐Yamamoto, A.; Itoh, Makoto; Usami, R.; Adachi, Seiji; Tanabe, K.

doi:10.1103/physrevb.55.6612

Cited by 92 publications

(45 citation statements)

References 29 publications

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“…( g , h ) Estimation of hole concentration ( p ) for Hg1212 ( g ) and Hg1223 ( h ) from a fitting curve (line) using the data in ref. 13 (solid circle). Squared symbols are data of present study.…”

Section: Figurementioning

confidence: 99%

High pressure effects revisited for the cuprate superconductor family with highest critical temperature

et al. 2015

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How to enhance the superconducting critical temperature (Tc) has been a primary issue since the discovery of superconductivity. The highest Tc reported so far is 166 K in HgBa2Ca2Cu3O8+δ (Hg1223) at high pressure of 23 GPa, as determined with the reduction onset, but not zero, of resistivity. To clarify the possible condition of the real maximum Tc, it is worth revisiting the effects of pressure on Tc in the highest Tc family. Here we report a systematic study of the pressure dependence of Tc in HgBa2CaCu2O6+δ (Hg1212) and Hg1223 with the doping level from underdoped to overdoped. The Tc with zero resistivity is probed with a cubic-anvil-type apparatus that can produce hydrostatic pressures. Variation, not only increase but also decrease, of Tc in Hg1212 and Hg1223 with pressure strongly depends on the initial doping levels. In particular, we confirm a maximum Tc of 153 K at 22 GPa in slightly underdoped Hg1223.

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Section: Figurementioning

confidence: 99%

High pressure effects revisited for the cuprate superconductor family with highest critical temperature

et al. 2015

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“…Assuming the valences of Hg 2+ , Se 6+ , Sr 2+ , Y 3+ , Ca 2+ and O 2À , we obtain a Cu valence of 2.14 from charge neutrality. This value falls in the underdoped region reported by Fukuoka et al [59]. The oxygen content for the as-prepared sample with the same x of 0.5 was also refined as z ¼ 6.83(4) by Rietveld analysis.…”

Section: Article In Pressmentioning

confidence: 97%

Sol–gel synthesis, structural and superconducting properties of (Hg1−ySey)Sr2(Y1−xCax)Cu2O6+δ

Kandyel

2008

Journal of Solid State Chemistry

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“…2). The increase of the transition temperature was evident with the increase of annealing time due to the increased oxygen content in the superconducting phase [23].…”

Section: Fig 2 R(t ) Dependences Of Films Prepared At 800mentioning

confidence: 99%

Role of the mercury pressure during reaction synthesis of Hg(Re)-based superconducting films

Valeriánová¹,

Chromík

Odier

et al. 2007

Open Physics

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Thin films of mercury based superconductors were prepared on the R-plane sapphire with a CeO 2 buffer layer using a two step process involving the deposition of the Hg-free precursor and ex situ mercuration in the sealed quartz tube. For the thin film preparation, a method with no contact between the mercury source and the precursor film was used for mercuration. We studied the influence of the basic parameters of the mercuration (annealing time, temperature and partial pressure of the mercury) regarding the composition and superconducting properties of prepared Hg-based films to determine appropriate conditions for this mercuration method. We found out that an increased partial pressure of mercury inhibited the creation of the parasitic Re-based phase and supported the crystallization of the superconducting phase. The advantage of this mercuration method is higher reproducibility as well as its capability to prepare high quality thin large areas films.

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Dependence ofTcand transport properties on the Cu valence inHgBa2

Cited by 92 publications

References 29 publications

High pressure effects revisited for the cuprate superconductor family with highest critical temperature

High pressure effects revisited for the cuprate superconductor family with highest critical temperature

Sol–gel synthesis, structural and superconducting properties of (Hg1−ySey)Sr2(Y1−xCax)Cu2O6+δ

Role of the mercury pressure during reaction synthesis of Hg(Re)-based superconducting films

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