TY - JOUR
T1 - Glassy vortex behavior in superconducting SrPd 2Ge 2 single crystals
AU - Sung, N. H.
AU - Jo, Y. J.
AU - Cho, B. K.
PY - 2012/7
Y1 - 2012/7
N2 - In this study we report the vortex-glass behavior of superconducting ternary germanide SrPd 2Ge 2 single crystals with a ThCr 2Si 2-type structure. We observed flux trapping and its nonexponential decay with time after the magnetic field was turned off at T=2K. In addition, we found that the diamagnetism in the zero field cooling (ZFC) mode below T c was irreversible, depending on the temperature and field history, whereas the diamagnetism in the field-cooled warming (FCW) mode was reversible if the applied magnetic field was parallel to the c-axis. An irreversibility line T r(H) was determined by the ZFC and FCW measurements at various magnetic fields, and the temperature dependence of T r(H) was found to agree with the de AlmeidaThouless relation, H=H 0[1T r(H)/T c(0)] γ, where γ=3/2. Including these vortex-glass behaviors, we discuss the critical current density, J c(T), determined from isothermal magnetization measurements at various temperatures, and the pinning potential, determined from the slope of an Arrhenius plot, lnR(T,B) versus 1/T.
AB - In this study we report the vortex-glass behavior of superconducting ternary germanide SrPd 2Ge 2 single crystals with a ThCr 2Si 2-type structure. We observed flux trapping and its nonexponential decay with time after the magnetic field was turned off at T=2K. In addition, we found that the diamagnetism in the zero field cooling (ZFC) mode below T c was irreversible, depending on the temperature and field history, whereas the diamagnetism in the field-cooled warming (FCW) mode was reversible if the applied magnetic field was parallel to the c-axis. An irreversibility line T r(H) was determined by the ZFC and FCW measurements at various magnetic fields, and the temperature dependence of T r(H) was found to agree with the de AlmeidaThouless relation, H=H 0[1T r(H)/T c(0)] γ, where γ=3/2. Including these vortex-glass behaviors, we discuss the critical current density, J c(T), determined from isothermal magnetization measurements at various temperatures, and the pinning potential, determined from the slope of an Arrhenius plot, lnR(T,B) versus 1/T.
UR - http://www.scopus.com/inward/record.url?scp=84861635178&partnerID=8YFLogxK
U2 - 10.1088/0953-2048/25/7/075002
DO - 10.1088/0953-2048/25/7/075002
M3 - Article
AN - SCOPUS:84861635178
SN - 0953-2048
VL - 25
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
IS - 7
M1 - 075002
ER -