Extremely high sensitivity to uniaxial stress in pressure induced superconductivity of BaFe2As2
arXiv:1003.0913 · doi:10.1103/PhysRevB.81.224511
Abstract
We have performed electrical resistivity measurements on single crystal BaFe2As2 under high pressure P up to 16 GPa with a cubic anvil apparatus, and up to 3 GPa with a modified Bridgman anvil cell. The samples were obtained from the same batch, which was grown with a self-flux method. A cubic anvil apparatus provides highly hydrostatic pressure, and a modified Bridgman anvil cell, which contains liquid pressure transmitting medium, provides quasi hydrostatic pressure. For highly hydrostatic pressure, the crystal phase and magnetic transition temperature decreases robustly with P and disappears at around 10 GPa. The superconducting phase appears adjacent to magnetic phase in narrow pressure region between 11 and 14 GPa. The tiny difference of hydrostaticity between the cubic anvil apparatus and modified Bridgman anvil cell induces a drastic effect on the phase diagram of BaFe2As2. This result indicates that small uniaxial stress along c-axis strongly suppresses the structural/antiferromagnetic ordering and stabilizes superconductivity at much lower pressure.
5 pages, 5 figures
References in corpus (14)
- Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
- Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
- The superconductivity at 18 K in LiFeAs system
- Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family
- Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
- Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)
- Pressure induced superconductivity in CaFeAs
- Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures
- Superconductivity at 17 K in (Fe2P2)(Sr4Sc2O6): a new superconducting layered pnictide oxide with a thick perovskite oxide layer
- The Absence of Superconductivity in Single Phase CaFe2As2 under Hydrostatic Pressure
- Neutron diffraction on antiferromagnetic ordering in single-crystal BaFe2As2
- Abrupt Emergence of Pressure-Induced Superconductivity of 34 K in SrFe2As2: A Resistivity Study under Pressure
- Effect of pressure on the structural phase transition and superconductivity in (B$_{1-x}K_x)Fe_2As_2 (x = 0 and 0.45) and SrFe_2As_2 single crystals
- Suppression of Magnetic Order by Pressure in BaFe2As2