Single crystals of CaFe2(As1-xPx) 2 are found to exhibit the tetragonal (T) to collapsed-tetragonal (cT) transition at TcT100 K for x0.05. The c-axis shrinks by ~9% below TcT, which substantially diminishes the interband nesting between the hole and electron bands. In sharp contrast to the superconducting T phase of AFe2(As1-xPx)2 (A= Ba, Sr), where the anomalous non-Fermi liquid transport properties are observed, the resistivity, Hall coefficient, and magnetoresistance data in the Ca-based system all indicate that the standard Fermi liquid behaviors are recovered abruptly below TcT, and the superconductivity disappears completely. The simultaneous disappearance of the superconductivity and the non-Fermi liquid transport enlightens the essential role of interband-associated fluctuations to the superconductivity in Fe pnictides.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2011 Feb 11|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics