Structural and magnetic phase transitions in ${\mathrm{Ca}}_{0.73}{\mathrm{La}}_{0.27}{\mathrm{FeAs}}_{2}$ with electron-overdoped FeAs layers

Structural and magnetic phase transitions in ${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ with electron-overdoped FeAs layers

Shan Jiang, Chang Liu, Huibo Cao, Turan Birol, Jared M. Allred, Wei Tian, Lian Liu, Kyuil Cho, Matthew J. Krogstad, Jie Ma, Keith M. Taddei, Makariy A. Tanatar, Moritz Hoesch, Ruslan Prozorov, Stephan Rosenkranz, Yasutomo J. Uemura, Gabriel Kotliar, and Ni Ni

Phys. Rev. B 93, 054522 – Published 26 February 2016

Abstract

We report a study of the ${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ single crystals. We unravel a monoclinic to triclinic phase transition at 58 K, and a paramagnetic to stripe antiferromagnetic phase transition at 54 K, below which spins order $45^{\circ}$ away from the stripe direction. Furthermore, we demonstrate this material is substantially structurally untwinned at ambient pressure with the formation of spin rotation walls (S walls). Finally, in addition to the central-hole and corner-electron Fermi pockets usually appearing in Fe pnictide superconductors, angle-resolved photoemission measurements resolve a fermiology where an extra electron pocket of mainly As chain character exists at the Brillouin zone edge.

Received 21 May 2015
Revised 28 December 2015
Publisher error corrected 29 February 2016

DOI:https://doi.org/10.1103/PhysRevB.93.054522

Physics Subject Headings (PhySH)

Antiferromagnetism Nematic order Superconductivity

Pnictides

Angle-resolved photoemission spectroscopy

Condensed Matter, Materials & Applied Physics

Corrections

29 February 2016

Erratum

Publisher's Note: Structural and magnetic phase transitions in ${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ with electron-overdoped FeAs layers [Phys. Rev. B 93, 054522 (2016)]

Shan Jiang, Chang Liu, Huibo Cao, Turan Birol, Jared M. Allred, Wei Tian, Lian Liu, Kyuil Cho, Matthew J. Krogstad, Jie Ma, Keith M. Taddei, Makariy A. Tanatar, Moritz Hoesch, Ruslan Prozorov, Stephan Rosenkranz, Yasutomo J. Uemura, Gabriel Kotliar, and Ni Ni

Phys. Rev. B 93, 099902 (2016)

Authors & Affiliations

Shan Jiang¹, Chang Liu², Huibo Cao³, Turan Birol⁴, Jared M. Allred⁵, Wei Tian³, Lian Liu⁶, Kyuil Cho⁷, Matthew J. Krogstad^5,8, Jie Ma³, Keith M. Taddei^5,8, Makariy A. Tanatar⁷, Moritz Hoesch⁹, Ruslan Prozorov⁷, Stephan Rosenkranz⁵, Yasutomo J. Uemura⁶, Gabriel Kotliar⁴, and Ni Ni^1,*

¹Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, California 90095, USA
²Department of Physics, South University of Science and Technology of China, Shenzhen, Guangdong 518055, China
³Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁴Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
⁵Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4845, USA
⁶Department of Physics, Columbia University, New York, New York 10027, USA
⁷Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
⁸Physics Department, Northern Illinois University, DeKalb, Illinois 60115, USA
⁹Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom

^*Corresponding author: nini@physics.ucla.edu

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Vol. 93, Iss. 5 — 1 February 2016

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Figure 1
${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ : (a) Electric resistivity $ρ_{∥ a b}$ ( $I ∥ a b$ ) and $ρ_{⊥ a b}$ ( $I ⊥ a b$ ) vs $T$ . Inset: Top view of the Fe and spacer As sublattices. The structure subtlety is exaggerated. Orange ball: Fe. Gray ball: As in the spacer layers. The orange and blue lines indicate Fe-Fe bonds with bond lengths of $L_{1}, L_{2}, L_{3}$ , and $L_{4}$ . $L_{1} + L_{3} = L_{2} + L_{4}$ if $γ = 90^{\circ}$ . The dashed lines enclose the unit cell. (b) Susceptibility $χ_{∥ a b}$ and $χ_{⊥ a b}$ vs $T$ . (c) The neutron intensity of the nuclear ${(0, 2, 0)}^{N}$ and the magnetic ${(1 / 2, 1 / 2, 1 / 2)}^{M}$ peaks vs $T$ . (d) Heat capacity $C_{p} / T$ and $d ρ_{∥ a b} / d T$ vs $T$ . (e) The neutron intensity of the ${(1 / 2, 1 / 2, 1 / 2)}^{M}$ peak at 55 K and 54 K with offset. (f) The magnetically ordered volume fraction $V$ and transverse relaxation rate $σ$ in zero-field muon spin rotation ( $ZF μ SR$ ) asymmetry spectra vs $T$ . (g) The neutron intensity of the ${(0, 2, 0)}^{N}$ peak at 200 K and 4.5 K. (h) The polarized optical image at 290 K. (i) The polarized optical image at 5 K.
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Figure 2
(a) The synchrotron x-ray $μ$ vs $2 θ$ diffractograms of the ${(2, 2, 0)}^{A}$ and ${(2, - 2, 0)}^{B}$ peaks from the growth domains A and B of ${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ , respectively. $μ$ is a rotation of the crystal along an axis perpendicular to the x-ray beam. (b) The cartoon comparison of the magnetic and crystal structures between ${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ and ${BaFe}_{2} {As}_{2}$ in a single growth domain. Orange ball: Fe. Blue arrow: Spin direction. Orange ribbon: Spin stripe along which the spins order in parallel. The dashed lines enclose the 2-Fe cell. (c) Splitting of the two reflections as determined by Gaussian fits. Inset: $d Δ d / d T$ vs $T$ .
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Figure 3
(a) The two-dimensional (2D) contour of the angle-resolved photoemission spectroscopy (ARPES) Fermi surface (FS) of ${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ at $K_{z} \sim π / c$ in the 2-Fe/cell representation. Red and orange circles: Two hole pockets at the center $Γ$ point. Blue ovals: Electron pockets at the corner $M$ point. Purple lines: Extra electron pocket arising from the As chains at the $X$ point. (b) The second derivative of ARPES $k - E$ maps. Two hole pockets at $Γ$ points can be clearly identified in the $Y - Γ$ cut. (c) The spectral function $A (k, ω)$ of ${Ca}_{0.7} {La}_{0.3} {FeAs}_{2}$ from DMFT. The red color represents the projection of the orbital character onto the in-plane $p$ orbitals of the As chain atoms. (d) The 2D contour of the DMFT FS of CaLa112 ( $x = 0$ and 0.3) at $K_{z} \sim π / c$ . (e), (f) The 3D DMFT FS of (e) CaLa112 ( $x = 0.3$ ) and (f) CaLa112 ( $x = 0.0$ ) in the 2-Fe/cell representation.
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Physical Review B

covering condensed matter and materials physics

Structural and magnetic phase transitions in ${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ with electron-overdoped FeAs layers

Shan Jiang, Chang Liu, Huibo Cao, Turan Birol, Jared M. Allred, Wei Tian, Lian Liu, Kyuil Cho, Matthew J. Krogstad, Jie Ma, Keith M. Taddei, Makariy A. Tanatar, Moritz Hoesch, Ruslan Prozorov, Stephan Rosenkranz, Yasutomo J. Uemura, Gabriel Kotliar, and Ni Ni

Phys. Rev. B 93, 054522 – Published 26 February 2016

Abstract

Physics Subject Headings (PhySH)

Corrections

Erratum

Publisher's Note: Structural and magnetic phase transitions in ${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ with electron-overdoped FeAs layers [Phys. Rev. B 93, 054522 (2016)]

Shan Jiang, Chang Liu, Huibo Cao, Turan Birol, Jared M. Allred, Wei Tian, Lian Liu, Kyuil Cho, Matthew J. Krogstad, Jie Ma, Keith M. Taddei, Makariy A. Tanatar, Moritz Hoesch, Ruslan Prozorov, Stephan Rosenkranz, Yasutomo J. Uemura, Gabriel Kotliar, and Ni Ni

Phys. Rev. B 93, 099902 (2016)

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Physical Review B

covering condensed matter and materials physics

Structural and magnetic phase transitions in Ca0.73La0.27FeAs2 with electron-overdoped FeAs layers

Shan Jiang, Chang Liu, Huibo Cao, Turan Birol, Jared M. Allred, Wei Tian, Lian Liu, Kyuil Cho, Matthew J. Krogstad, Jie Ma, Keith M. Taddei, Makariy A. Tanatar, Moritz Hoesch, Ruslan Prozorov, Stephan Rosenkranz, Yasutomo J. Uemura, Gabriel Kotliar, and Ni Ni

Phys. Rev. B 93, 054522 – Published 26 February 2016

Abstract

Physics Subject Headings (PhySH)

Corrections

Erratum

Publisher's Note: Structural and magnetic phase transitions in Ca0.73La0.27FeAs2 with electron-overdoped FeAs layers [Phys. Rev. B 93, 054522 (2016)]

Shan Jiang, Chang Liu, Huibo Cao, Turan Birol, Jared M. Allred, Wei Tian, Lian Liu, Kyuil Cho, Matthew J. Krogstad, Jie Ma, Keith M. Taddei, Makariy A. Tanatar, Moritz Hoesch, Ruslan Prozorov, Stephan Rosenkranz, Yasutomo J. Uemura, Gabriel Kotliar, and Ni Ni

Phys. Rev. B 93, 099902 (2016)

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Structural and magnetic phase transitions in ${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ with electron-overdoped FeAs layers

Publisher's Note: Structural and magnetic phase transitions in ${Ca}_{0.73} {La}_{0.27} {FeAs}_{2}$ with electron-overdoped FeAs layers [Phys. Rev. B 93, 054522 (2016)]