Speaker
T. J. Bullard
(UES Inc. Dayton, OH)
Description
Single crystals of Ba(Fe1-xNix)2As2 have been produced for systematic magnetic measurements of the critical current density (Jc) over a range of dopings from
x=0.025 to 0.066 and a range of temperatures from 2 K. Analysis of the field dependent critical current density, Jc, shows strong evidence pointing to a flux pinning mechanism dominated by local variation in the mean free path for all dopings. The values of Jc measured indicate a peak at approximately x=0.049 on the pseudo phase diagram, close to a proposed quantum critical point at x=0.05. Pressure dependent measurements of this sample show anomalous behaviour including a negative pressure relationship and a peak in Jc around 0.65 GPa.
Primary authors
G. Bioletti
(Robinson Research Institute, Victoria University of Wellington, PO Box 33436, Petone 5046, New Zealand)
D. M. Uhrig
(Robinson Research Institute, Victoria University of Wellington, PO Box 33436, Petone 5046, New Zealand)
Michael Susner
(Air Force Research Laboratory)
Timothy Haugan
(U.S. Air Force Research Laboratory)
G. V. M. Williams
(School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand)
S. V. Chong
(School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington,)
T. J. Bullard
(UES Inc. Dayton, OH)
