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Structural collapse and superconductivity in rare-earth-doped CaFe2As2
Physical Review B
Aliovalent rare earth substitution into the alkaline earth site of CaFe2As2 single-crystals is used to fine-tune structural, magnetic and electronic properties of this iron-based superconducting system. Neutron and single crystal x-ray scattering experiments indicate that an isostructural collapse of the tetragonal unit cell can be controllably induced at ambient pressures by choice of substituent ion size. This instability is driven by the interlayer As-As anion separation, resulting in andoi:10.1103/physrevb.85.024525 fatcat:vhwweyhprrddfbbtgdiviwztq4