TY - JOUR
T1 - The low temperature microwave properties of GdBa₂Cu₃O₇₋δ and Sr₂RuO₄
AU - Gough, Colin
AU - Ormeno, Rodrigo
AU - Hein, Matthias
AU - Sibley, Andrew
AU - Wingfield, JJ
AU - Powell, J
AU - Porch, Adrian
AU - Yang, Guang
AU - Maeno, Y
AU - Mao, ZQ
PY - 2001/1/1
Y1 - 2001/1/1
N2 - Measurements of the microwave surface resistance R-s and reactance X-s of GdBa2Cu3O7-delta and Sr2RuO4 single crystals are reported in the temperature range 0.4 to 25 K at frequencies from 10 to 20 GHz, using a hollow dielectric resonator technique. The GdBa2Cu3O7-delta measurements are interpreted in terms of antiferromagnetic alignment of the Gd spins, resulting in a Neel transition at 2.25 K, with a strongly temperature spin relaxation time both above and below the transition. Above T-c = 1.45 K, the normal state surface impedance of the suspected p-wave superconductor Sr2RuO4 agrees rather well with that expected from de measurements; however, below T-c, we observe an unusual increase in the surface reactance, which we attribute to a long electron relaxation time. Using a two-fluid model, we obtain a normal fluid component that decreases almost linearly with temperature and extrapolates to a finite low-temperature value.
AB - Measurements of the microwave surface resistance R-s and reactance X-s of GdBa2Cu3O7-delta and Sr2RuO4 single crystals are reported in the temperature range 0.4 to 25 K at frequencies from 10 to 20 GHz, using a hollow dielectric resonator technique. The GdBa2Cu3O7-delta measurements are interpreted in terms of antiferromagnetic alignment of the Gd spins, resulting in a Neel transition at 2.25 K, with a strongly temperature spin relaxation time both above and below the transition. Above T-c = 1.45 K, the normal state surface impedance of the suspected p-wave superconductor Sr2RuO4 agrees rather well with that expected from de measurements; however, below T-c, we observe an unusual increase in the surface reactance, which we attribute to a long electron relaxation time. Using a two-fluid model, we obtain a normal fluid component that decreases almost linearly with temperature and extrapolates to a finite low-temperature value.
UR - http://www.scopus.com/inward/record.url?scp=18044400735&partnerID=8YFLogxK
U2 - 10.1023/A:1007836323126
DO - 10.1023/A:1007836323126
M3 - Article
VL - 14
SP - 73
EP - 79
JO - Journal of Superconductivity
JF - Journal of Superconductivity
IS - 1
ER -