Compositional Control of the Superconducting Properties of LiFeAs

被引：63

作者：

Pitcher, Michael J. ^{[2
]}

Lancaster, Tom ^{[1
]}

Wright, Jack D. ^{[1
]}

Franke, Isabel ^{[1
]}

Steele, Andrew J. ^{[1
]}

Baker, Peter J. ^{[3
]}

Pratt, Francis L. ^{[3
]}

Thomas, William Trevelyan ^{[2
]}

Parker, Dinah R. ^{[2
]}

Blundell, Stephen J. ^{[1
]}

Clarke, Simon J. ^{[2
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[2] Univ Oxford, Inorgan Chem Lab, Dept Chem, Oxford OX1 3QR, England

[3] STFC Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 30期

基金：

英国工程与自然科学研究理事会;

关键词：

II SUPERCONDUCTORS; CRYSTAL-STRUCTURE; PHASE-DIAGRAM; MU-SR; T-C; PRESSURE; DENSITY; CUPRATE; SYSTEMS; METAL;

D O I：

10.1021/ja103196c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The response of the superconducting state and crystal structure of LiFeAs to chemical substitutions on both the Li and the Fe sites has been probed using high-resolution X-ray and neutron diffraction measurements, magnetometry, and muon-spin rotation spectroscopy. The superconductivity is extremely sensitive to composition: Li-deficient materials (Li1-yFe1+yAs with Fe substituting for Li) show a very rapid suppression of the superconducting state, which is destroyed when y exceeds 0.02, echoing the behavior of the Fe1+ySe system. Substitution of Fe by small amounts of Co or Ni results in monotonic lowering of the superconducting transition temperature, T-c, and the superfluid stiffness, rho(s), as the electron count increases. T-c is lowered monotonically at a rate of 10 K per 0.1 electrons added per formula unit irrespective of whether the dopant is Co and Ni, and at higher doping levels superconductivity is completely suppressed. These results and the demonstration that the superfluid stiffness in these LiFeAs-derived compounds is higher than in all of the iron pnictide materials underlines the unique position that LiFeAs occupies in this class.

引用

页码：10467 / 10476

页数：10

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