Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

9-1-2011

Journal or Book Title

Physical Review B

Volume

84

Issue

10

First Page

104444

DOI

10.1103/PhysRevB.84.104444

Abstract

The effects of chemical doping by P, Yb, Co, and Cu, and hydrostatic pressure on CaFe4As3, were studied on single-crystalline samples. While the former two dopants substitute the nonmagnetic ions, the latter two partially occupy the Fe sites within the magnetic sublattice. The incommensurate spin density wave (IC-SDW) ordering at TN∼ 88 K in CaFe4As3 changes only by up to ∼40% with doping and applied pressure. Thus the IC-SDW state appears more robust than in the layered Fe pnictides. The commensurate SDW (C-SDW) state below T2∼ 26 K is suppressed in the Co-doped series, while it moves up in temperature in the P-, Yb-, and Cu-doped compounds. A new magnetic phase transition is observed at an intermediate temperature T3 in Ca(Fe1−xCox)4As3. Resistivity and magnetization measurements on CaFe4As3 were performed under hydrostatic pressure up to 5 GPa, showing a systematic decrease of TN and a domelike phase boundary at T2 up to pc∼ 2.10 GPa. At higher pressures, a possible structural phase transition occurs, marked by a slowly increasing transition temperature. A phase diagram is shown to compare the effects of chemical doping and pressure.

Comments

This article is published as Zhao, Liang L., S. K. Kim, Gregory T. McCandless, Milton S. Torikachvili, P. C. Canfield, Julia Y. Chan, and E. Morosan. "Effects of chemical doping and pressure on CaFe 4 As 3." Physical Review B 84, no. 10 (2011): 104444. DOI: 10.1103/PhysRevB.84.104444. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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