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arXiv · 1406.7593

Lattice distortion and stripe-like antiferromagnetic order in Ca10(Pt3As8)(Fe2As2)5

A. Sapkota·G. S. Tucker·M. Ramazanoglu·W. Tian·N. Ni·R. J. Cava·R. J. McQueeney·A. I. Goldman·A. Kreyssig
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Abstract

Ca10(Pt3As8)(Fe2As2)5 is the parent compound for a class of Fe-based high-temperature superconductors where superconductivity with transition temperatures up to 30 K can be introduced by partial element substitution. We present a combined high-resolution high-energy x-ray diffraction and elastic neutron scattering study on a Ca10(Pt3As8)(Fe2As2)5 single crystal. This study reveals the microscopic nature of two distinct and continuous phase transitions to be very similar to other Fe-based high-temperature superconductors: an orthorhombic distortion of the high-temperature tetragonal Fe-As lattice below T_S = 110(2) K followed by stripe-like antiferromagnetic ordering of the Fe moments below T_N = 96(2) K. These findings demonstrate that major features of the Fe-based high-temperature superconductors are very robust against variations in chemical constitution as well as structural imperfection of the layers separating the Fe-As layers from each other and confirms that the Fe-As layers primarily determine the physics in this class of material.

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A. Sapkota, G. S. Tucker, M. Ramazanoglu, W. Tian, N. Ni, R. J. Cava, R. J. McQueeney, A. I. Goldman, A. Kreyssig. 2014-06-30. Lattice distortion and stripe-like antiferromagnetic order in Ca10(Pt3As8)(Fe2As2)5. https://doi.org/10.1103/physrevb.90.100504

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