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; Ni Ni

doi:10.1103/PhysRevB.93.054522

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, Ni Ni

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Abstract

We report a study of the Ca0.73La0.27FeAs2 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 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.

Original language	English
Article number	054522
Journal	Physical Review B
Volume	93
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.93.054522
State	Published - Feb 26 2016

Funding

Work at UCLA was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES) under Award No. DE-SC0011978. Work at ORNL''s High Flux Isotope Reactor and at ANL''s Advanced Photon Source was sponsored by the Scientific User Facilities Division, BES, DOE. Work at Argonne and Ames was supported by the Materials Sciences and Engineering Division, BES, DOE. Ames Lab is operated for the DOE by Iowa State University under Contract No. DE-AC02-07CH11358. Work at Columbia and TRIUMF was supported by the NSF DMREF DMR-1436095, PIRE project IIA 0968226, and DMR-1105961. Work at Rutgers was supported by the NSF DMREF DMR-1435918. S.J. and C.L. contributed equally to this work.

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10.1103/PhysRevB.93.054522

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Jiang, S., Liu, C., Cao, H., Birol, T., Allred, J. M., Tian, W., Liu, L., Cho, K., Krogstad, M. J., Ma, J., Taddei, K. M., Tanatar, M. A., Hoesch, M., Prozorov, R., Rosenkranz, S., Uemura, Y. J., Kotliar, G., & Ni, N. (2016). Structural and magnetic phase transitions in Ca0.73La0.27FeAs2 with electron-overdoped FeAs layers. Physical Review B, 93(5), Article 054522. https://doi.org/10.1103/PhysRevB.93.054522

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

abstract = "We report a study of the Ca0.73La0.27FeAs2 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 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.",

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

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Jiang, S, Liu, C, Cao, H, Birol, T, Allred, JM, Tian, W, Liu, L, Cho, K, Krogstad, MJ, Ma, J, Taddei, KM, Tanatar, MA, Hoesch, M, Prozorov, R, Rosenkranz, S, Uemura, YJ, Kotliar, G & Ni, N 2016, 'Structural and magnetic phase transitions in Ca0.73La0.27FeAs2 with electron-overdoped FeAs layers', Physical Review B, vol. 93, no. 5, 054522. https://doi.org/10.1103/PhysRevB.93.054522

TY - JOUR

T1 - Structural and magnetic phase transitions in Ca0.73La0.27FeAs2 with electron-overdoped FeAs layers

AU - Jiang, Shan

AU - Liu, Chang

AU - Cao, Huibo

AU - Birol, Turan

AU - Allred, Jared M.

AU - Tian, Wei

AU - Liu, Lian

AU - Cho, Kyuil

AU - Krogstad, Matthew J.

AU - Ma, Jie

AU - Taddei, Keith M.

AU - Tanatar, Makariy A.

AU - Hoesch, Moritz

AU - Prozorov, Ruslan

AU - Rosenkranz, Stephan

AU - Uemura, Yasutomo J.

AU - Kotliar, Gabriel

AU - Ni, Ni

PY - 2016/2/26

Y1 - 2016/2/26

N2 - We report a study of the Ca0.73La0.27FeAs2 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 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.

AB - We report a study of the Ca0.73La0.27FeAs2 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 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.

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ER -

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

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