Reversible tuning of the collapsed tetragonal phase transition in CaFe2As2 by separate control of chemical pressure and electron doping

被引：7

作者：

Zhao, K. ^{[1
]}

Stingl, C. ^{[1
]}

Manna, R. S. ^{[1
]}

Jin, C. Q. ^{[2
,3
,4
]}

Gegenwart, P. ^{[1
]}

机构：

[1] Univ Augsburg, Ctr Elect Correlat & Magnetism, Expt Phys 6, D-86159 Augsburg, Germany

[2] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[4] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 23期

关键词：

SUPERCONDUCTIVITY;

D O I：

10.1103/PhysRevB.92.235132

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Single crystals of Ca(Fe1-xRux)(2)As-2 (0 <= x <= 0.065) and Ca1-yLay (Fe0.973Ru0.027)(2)As-2 (0 <= y <= 0.2) have been synthesized and studied with respect to their structural, electronic, and magnetic properties. The partial substitution of Fe by Ru induces a decrease of the c-axis constant leading for x <= 0.023 to a suppression of the coupled magnetic and structural (tetragonal to orthorhombic) transitions. At x(cr) = 0.023 a first-order transition to a collapsed tetragonal (CT) phase is found, which behaves like a Fermi liquid and which is stabilized by further increase of x. The absence of superconductivity near xcr is consistent with truly hydrostatic pressure experiments on undoped CaFe2As2. Starting in the CT regime at x = 0.027, we investigate the additional effect of electron doping by partial replacement of Ca by La. Most remarkably, with increasing y the CT phase transition is destabilized and the system is tuned back into a tetragonal ground state at y >= 0.08. This effect is ascribed to a weakening of interlayer As-As bonds by electron doping. Upon further electron doping filamentary superconductivity with T-c of 41 K at y = 0.2 is observed.

引用

页数：7

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