1. Uniaxial Strain Effects on Superconducting Transition in Y0.98Ca0.02Ba2Cu4O8
- Author
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Hiroyuki Deguchi, Kaname Matsumoto, Masaki Mito, Hideaki Matsui, Hiroki Goto, Toshinori Ozaki, Yoshihiko Takano, Hiroyuki Takeya, and Hiroshi Hara
- Subjects
Superconductivity ,Magnetic measurements ,Materials science ,Strain (chemistry) ,Condensed matter physics ,Doping ,Hydrostatic pressure ,General Physics and Astronomy ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,law.invention ,Stress (mechanics) ,law ,0103 physical sciences ,Superconducting transition temperature ,Hydrostatic equilibrium ,010306 general physics ,0210 nano-technology - Abstract
The effects of uniaxial strain and hydrostatic pressure on Y0.98Ca0.02Ba2Cu4O8 [called Y0.98(Ca0.02)-124] are investigated via AC magnetic measurements under stress corresponding to a pressure of (at most) 20 GPa. Hydrostatic contraction results in the largest enhancement of the superconducting transition temperature (Tc), whose maximum is 99 K, which is slightly lower than the maximum Tc achieved in YBa2Cu4O8 (called Y-124). The Meissner signal disappears at a hydrostatic pressure of approximately 15 GPa. This pressure region representing the Meissner signal is reduced by the out-of-plane contraction (along the c-axis), whereas it is increased by the in-plane contraction (along the c-plane). In the case of Y-124, both uniaxial contractions result in the disappearance of the Meissner signal at approximately 10 GPa prior to reaching the overdoped region. However, by doping Ca into the Y-site, we could investigate uniaxial strain effects characteristic of the so-called 124 structure without causing the stre...
- Published
- 2016