Elastic Instability of the Orthorhombic Antiferromagnetic Phase of 122-Pnictides Under Pressure
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- 作者：Michael Widom ; Khandker Quader
- 关键词：122 ; Pnictides ; Elastic instability ; Metastable OR ; Pressure
- 刊名：Journal of Superconductivity Incorporating Novel Magnetism
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：29
- 期：3
- 页码：685-689
- 全文大小：291 KB
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Khandker Quader (2)
1. Department of Physics, Carnegie-Mellon University, Pittsburgh, PA, 15213, USA
2. Department of Physics, Kent State University, Kent, OH, 44242, USA - 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Superconductivity, Superfluidity and Quantum Fluids
Magnetism and Magnetic Materials
Condensed Matter
Characterization and Evaluation Materials - 出版者：Springer New York
- ISSN：1557-1947
文摘
A-122 pnictides (A an alkaline earth element) possess striped antiferromagnetic states of orthorhombic (OR) symmetry and nonmagnetic states of tetragonal (T) symmetry. Based on total energy calculations, we show that the T = 0 K pressure-driven transition from OR to T states occurs at a pressure, P H, where the tetragonal enthalpy drops below the orthorhombic. The OR state remains metastable up to a higher pressure, P M > P H. We find anomalies in magnetism and orthorhombicity as P → P M and a trend towards elastic instability.