TY - JOUR
T1 - Field- and temperature-dependent surface resistance of superconducting polycrystalline multiple-phase Hg-Ba-Ca-Cu-O
T2 - Evidence for dirty-limit behavior
AU - Blackstead, H. A.
AU - Pulling, D. B.
AU - Paranthaman, M.
AU - Brynestad, J.
PY - 1995
Y1 - 1995
N2 - Field- and temperature-dependent surface resistance measurements at 12.9 GHz are reported for polycrystalline Hg-Ba-Ca-Cu-O, which was found to consist primarily of the HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ phases. A small amount of a third phase, most likely HgBa2Ca3Cu4O10+δ, was also detected. With variation of the angle Ψ between the applied field and current density, the low-temperature data exhibit large flux-flow resistivity that varies approximately as sin2(Ψ), while at high temperatures, the dominant field- and temperature-dependent response is attributed to isotropic phase-slip losses in intragranular defects. For temperatures just below the transition temperature of the two-layer phase, very small flux flow is evidenced. This result is consistent with an effective Hc2 of unusual size, suggesting a dirty-limit value for Hc2.
AB - Field- and temperature-dependent surface resistance measurements at 12.9 GHz are reported for polycrystalline Hg-Ba-Ca-Cu-O, which was found to consist primarily of the HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ phases. A small amount of a third phase, most likely HgBa2Ca3Cu4O10+δ, was also detected. With variation of the angle Ψ between the applied field and current density, the low-temperature data exhibit large flux-flow resistivity that varies approximately as sin2(Ψ), while at high temperatures, the dominant field- and temperature-dependent response is attributed to isotropic phase-slip losses in intragranular defects. For temperatures just below the transition temperature of the two-layer phase, very small flux flow is evidenced. This result is consistent with an effective Hc2 of unusual size, suggesting a dirty-limit value for Hc2.
UR - http://www.scopus.com/inward/record.url?scp=0040674707&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.51.3783
DO - 10.1103/PhysRevB.51.3783
M3 - Article
AN - SCOPUS:0040674707
SN - 0163-1829
VL - 51
SP - 3783
EP - 3790
JO - Physical Review B
JF - Physical Review B
IS - 6
ER -