Phase diagram of Ba 1-xK xFe 2As 2

S. Avci, O. Chmaissem, D. Y. Chung, S. Rosenkranz, E. A. Goremychkin, J. P. Castellan, I. S. Todorov, J. A. Schlueter, H. Claus, A. Daoud-Aladine, D. D. Khalyavin, Mercouri G Kanatzidis, R. Osborn

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Abstract

We report the results of a systematic investigation of the phase diagram of the iron-based superconductor Ba 1-xK xFe 2As 2 from x = 0 to x = 1.0 using high-resolution neutron and x-ray diffraction and magnetization measurements. The polycrystalline samples were prepared with an estimated compositional variation of Δx 0.01, allowing a more precise estimate of the phase boundaries than reported so far. At room temperature, Ba 1-xK xFe 2As 2 crystallizes in a tetragonal structure with the space group symmetry of I4/mmm, but at low doping, the samples undergo a coincident first-order structural and magnetic phase transition to an orthorhombic (O) structure with the space group Fmmm and a striped antiferromagnet (AF) with the space group F cmm′m′. The transition temperature falls from a maximum of 139 K in the undoped compound to 0 K at x = 0.252, with a critical exponent as a function of doping of 0.25(2) and 0.12(1) for the structural and magnetic order parameters, respectively. The onset of superconductivity occurs at a critical concentration of x = 0.130(3), and the superconducting transition temperature grows linearly with x until it crosses the AF/O phase boundary. Below this concentration, there is microscopic phase coexistence of the AF/O and superconducting order parameters, although a slight suppression of the AF/O order is evidence that the phases are competing. At higher doping, superconductivity has a maximum T c of 38 K at x = 0.4 that falls to 3 K at x = 1.0. We discuss reasons for the suppression of the spin density wave order and the electron-hole asymmetry in the phase diagram.

Original languageEnglish
Article number184507
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number18
DOIs
Publication statusPublished - May 7 2012

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Phase diagrams
Doping (additives)
phase diagrams
Phase boundaries
Superconductivity
Superconducting transition temperature
superconductivity
transition temperature
retarding
Spin density waves
Magnetization
Neutrons
x ray diffraction
Diffraction
Phase transitions
asymmetry
exponents
iron
neutrons
X rays

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Avci, S., Chmaissem, O., Chung, D. Y., Rosenkranz, S., Goremychkin, E. A., Castellan, J. P., ... Osborn, R. (2012). Phase diagram of Ba 1-xK xFe 2As 2 Physical Review B - Condensed Matter and Materials Physics, 85(18), [184507]. https://doi.org/10.1103/PhysRevB.85.184507

Phase diagram of Ba 1-xK xFe 2As 2 . / Avci, S.; Chmaissem, O.; Chung, D. Y.; Rosenkranz, S.; Goremychkin, E. A.; Castellan, J. P.; Todorov, I. S.; Schlueter, J. A.; Claus, H.; Daoud-Aladine, A.; Khalyavin, D. D.; Kanatzidis, Mercouri G; Osborn, R.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 18, 184507, 07.05.2012.

Research output: Contribution to journalArticle

Avci, S, Chmaissem, O, Chung, DY, Rosenkranz, S, Goremychkin, EA, Castellan, JP, Todorov, IS, Schlueter, JA, Claus, H, Daoud-Aladine, A, Khalyavin, DD, Kanatzidis, MG & Osborn, R 2012, 'Phase diagram of Ba 1-xK xFe 2As 2 ', Physical Review B - Condensed Matter and Materials Physics, vol. 85, no. 18, 184507. https://doi.org/10.1103/PhysRevB.85.184507
Avci S, Chmaissem O, Chung DY, Rosenkranz S, Goremychkin EA, Castellan JP et al. Phase diagram of Ba 1-xK xFe 2As 2 Physical Review B - Condensed Matter and Materials Physics. 2012 May 7;85(18). 184507. https://doi.org/10.1103/PhysRevB.85.184507
Avci, S. ; Chmaissem, O. ; Chung, D. Y. ; Rosenkranz, S. ; Goremychkin, E. A. ; Castellan, J. P. ; Todorov, I. S. ; Schlueter, J. A. ; Claus, H. ; Daoud-Aladine, A. ; Khalyavin, D. D. ; Kanatzidis, Mercouri G ; Osborn, R. / Phase diagram of Ba 1-xK xFe 2As 2 In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 85, No. 18.
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AU - Claus, H.

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N2 - We report the results of a systematic investigation of the phase diagram of the iron-based superconductor Ba 1-xK xFe 2As 2 from x = 0 to x = 1.0 using high-resolution neutron and x-ray diffraction and magnetization measurements. The polycrystalline samples were prepared with an estimated compositional variation of Δx 0.01, allowing a more precise estimate of the phase boundaries than reported so far. At room temperature, Ba 1-xK xFe 2As 2 crystallizes in a tetragonal structure with the space group symmetry of I4/mmm, but at low doping, the samples undergo a coincident first-order structural and magnetic phase transition to an orthorhombic (O) structure with the space group Fmmm and a striped antiferromagnet (AF) with the space group F cmm′m′. The transition temperature falls from a maximum of 139 K in the undoped compound to 0 K at x = 0.252, with a critical exponent as a function of doping of 0.25(2) and 0.12(1) for the structural and magnetic order parameters, respectively. The onset of superconductivity occurs at a critical concentration of x = 0.130(3), and the superconducting transition temperature grows linearly with x until it crosses the AF/O phase boundary. Below this concentration, there is microscopic phase coexistence of the AF/O and superconducting order parameters, although a slight suppression of the AF/O order is evidence that the phases are competing. At higher doping, superconductivity has a maximum T c of 38 K at x = 0.4 that falls to 3 K at x = 1.0. We discuss reasons for the suppression of the spin density wave order and the electron-hole asymmetry in the phase diagram.

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