High pressure study on LaFeAsO with different Tc

Wei Yi; Chao Zhang; Liling Sun; Zhi-an Ren; Wei Lu; Xiaoli Dong; Zhengcai Li; Guangcan Che; Jie Yang; Xiaoli Shen; Xi Dai; Zhong Fang; Fang Zhou; Zhongxian Zhao

doi:10.1209/0295-5075/84/67009

High pressure study on LaFeAsO with different Tc

Superconductivity 2015-05-13 v3

Authors: Wei Yi , Chao Zhang , Liling Sun , Zhi-an Ren , Wei Lu , Xiaoli Dong , Zhengcai Li , Guangcan Che , Jie Yang , Xiaoli Shen , Xi Dai , Zhong Fang , Fang Zhou , Zhongxian Zhao

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

We report studies on pressure dependence of superconducting transition temperature (Tc) of LaFeAsO, LaFeAs(O0.5F0.5) and LaFeAs(O0.89F0.11) samples. In-situ resistance measurements under high pressure showed that the Tc of these three compounds increases with pressure initially, reaches a maximum value and then decreases with further increasing pressure, although the Tc at ambient pressure are different. The onset Tc of LaFeAsO is ~50 K at 1.5 GPa, which is the highest record in La-based oxypnicited system. The significant change in Tc induced by pressure is attributed to the orbital degeneracy and the electron density of state at the Fermi level.

Keywords

high-pressure phase transitions high-temperature superconductivity

Cite

@article{arxiv.0809.4702,
  title  = {High pressure study on LaFeAsO with different Tc},
  author = {Wei Yi and Chao Zhang and Liling Sun and Zhi-an Ren and Wei Lu and Xiaoli Dong and Zhengcai Li and Guangcan Che and Jie Yang and Xiaoli Shen and Xi Dai and Zhong Fang and Fang Zhou and Zhongxian Zhao},
  journal= {arXiv preprint arXiv:0809.4702},
  year   = {2015}
}

Comments

13 pages, 4 figures

High pressure study on LaFeAsO with different Tc

Abstract

Keywords

Cite

Comments

Related papers