TY - JOUR
T1 - High pressure studies on Fe-pnictide superconductors
AU - Chu, C. W.
AU - Lorenz, B.
N1 - Funding Information:
This work is supported in part by the T.L.L. Temple Foundation, the John J. and Rebecca Moores Endowment, the State of Texas through TCSUH, the US Air Force Office of Scientific Research, and the LBNL through the US Department of Energy.
PY - 2009
Y1 - 2009
N2 - A review of high pressure studies on Fe-pnictide superconductors is given. The pressure effects on the magnetic and superconducting transitions are discussed for different classes of doped and undoped FeAs-compounds: ROFeAs (R = rare-earth), AeFe2As2 (Ae = Ca, Sr, Ba), and AFeAs (A = Li, Na). Pressure tends to decrease the magnetic transition temperature in the undoped or only slightly doped compounds. The superconducting Tc increases with low pressure for underdoped FeAs-pnictides, remains approximately constant for optimal doping, and decreases linearly in the overdoped range. The undoped LaOFeAs and AeFe2As2 become superconducting under pressure although non-hydrostatic pressure condition seems to play a role in CaFe2As2. The superconductivity in the (undoped) AFeAs is explained as a chemical pressure effect due to the volume contraction caused by the small ionic size of the A-elements. The binary FeSe shows the largest pressure coefficient of Tc in the Se-deficient superconducting phase.
AB - A review of high pressure studies on Fe-pnictide superconductors is given. The pressure effects on the magnetic and superconducting transitions are discussed for different classes of doped and undoped FeAs-compounds: ROFeAs (R = rare-earth), AeFe2As2 (Ae = Ca, Sr, Ba), and AFeAs (A = Li, Na). Pressure tends to decrease the magnetic transition temperature in the undoped or only slightly doped compounds. The superconducting Tc increases with low pressure for underdoped FeAs-pnictides, remains approximately constant for optimal doping, and decreases linearly in the overdoped range. The undoped LaOFeAs and AeFe2As2 become superconducting under pressure although non-hydrostatic pressure condition seems to play a role in CaFe2As2. The superconductivity in the (undoped) AFeAs is explained as a chemical pressure effect due to the volume contraction caused by the small ionic size of the A-elements. The binary FeSe shows the largest pressure coefficient of Tc in the Se-deficient superconducting phase.
UR - http://www.scopus.com/inward/record.url?scp=65649130495&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=65649130495&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2009.03.030
DO - 10.1016/j.physc.2009.03.030
M3 - Article
AN - SCOPUS:65649130495
SN - 0921-4534
VL - 469
SP - 385
EP - 395
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 9-12
ER -