Structural and magnetic phase transitions in Ca0.73Le0.27FeAs2 with electron-overdoped FeAs layers

被引：40

作者：

Jiang, Shan ^{[1
,2
]}

Liu, Chang ^{[3
]}

Cao, Huibo ^{[4
]}

Birol, Turan ^{[5
]}

Allred, Jared M. ^{[6
]}

Tian, Wei ^{[4
]}

Liu, Lian ^{[7
]}

Cho, Kyuil ^{[8
,9
]}

Krogstad, Matthew J. ^{[6
,10
]}

Ma, Jie ^{[4
]}

Taddei, Keith M. ^{[6
,10
]}

Tanatar, Makariy A. ^{[8
,9
]}

Hoesch, Moritz ^{[11
]}

Prozorov, Ruslan ^{[8
,9
]}

Rosenkranz, Stephan ^{[6
]}

Uemura, Yasutomo J. ^{[7
]}

Kotliar, Gabriel ^{[5
]}

Ni, Ni ^{[1
,2
]}

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[2] Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USA

[3] South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China

[4] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[5] Rutgers State Univ, Dept Phys & Astron, POB 849, Piscataway, NJ 08854 USA

[6] Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA

[7] Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA

[8] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[9] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[10] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

[11] Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxon, England

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 05期

基金：

美国国家科学基金会;

关键词：

IRON; NEUTRON; STATES;

D O I：

10.1103/PhysRevB.93.054522

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 degrees 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.

引用

页数：5

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