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arXiv 1805.09288cond-mat.supr-concond-mat.str-el
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高压下RbEuFe4As4和CsEuFe4As4的超导和磁性phase diagram

Superconducting and magnetic phase diagram of RbEuFe4As4 and CsEuFe4As4 at high pressure

Daniel E. Jackson, Derrick VanGennep, Wenli Bi, Dongzhou Zhang, Philipp Materne, Yi Liu, Guang-Han Cao, Samuel T. Weir, Yogesh K. Vohra, James J. Hamlin

摘要:

最近发现的(Rb,Cs)EuFe_4As_4化合物具有超导性(Tc = 35 K)和铁磁性(Tm = 15 K)的独特组合。我们已经进行了一系列的X射线衍射,交流磁化率,直流磁化强度,和电阻率测量RbEuFe 4As 4和CsEuFe 4As 4的压力高达30 GPa。我们发现,超导电性的开始单调抑制压力,而磁转变增强的初始速率dTm/dP = 1.7 K/GPa和1.5 K/GPa的RbEuFe 4As 4和CsEuFe 4As 4,分别。在7 GPa附近,Tc起始和Tm变得相当。在更高的压力下,体超导性的特征逐渐消失。室温X射线衍射测量表明在10 GPa(RbEuFe_4As_4)和12 GPa(CsEuFe_4As_4)下开始从四方晶系(T)转变为半四方晶系(hcT)相。调整Tc和Tm的能力,以符合相对温和的压力突出(Rb,Cs)EuFe 4As 4化合物作为理想的系统,研究超导性和铁磁性的相互作用。

英文摘要:

The recently discovered (Rb,Cs)EuFe4As4 compounds exhibit an unusual combination of superconductivity (Tc = 35 K) and ferromagnetism (Tm = 15 K). We have performed a series of x-ray diffraction, ac magnetic susceptibility, dc magnetization, and electrical resistivity measurements on both RbEuFe4As4 and CsEuFe4As4 to pressures as high as 30 GPa. We find that the superconductivity onset is suppressed monotonically by pressure while the magnetic transition is enhanced at initial rates of dTm/dP = 1.7 K/GPa and 1.5 K/GPa for RbEuFe4As4 and CsEuFe4As4, respectively. Near 7 GPa, Tc onset and Tm become comparable. At higher pressures, signatures of bulk superconductivity gradually disappear. Room temperature x-ray diffraction measurements suggest the onset of a transition from tetragonal (T) to a half collapsed-tetragonal (hcT) phase at 10 GPa (RbEuFe4As4) and 12 GPa (CsEuFe4As4). The ability to tune Tc and Tm into coincidence with relatively modest pressures highlights (Rb,Cs)EuFe4As4 compounds as ideal systems to study the interplay of superconductivity and ferromagnetism.

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