Anomalous microwave conductivity due to collective transport in the pseudogap state of cuprate superconductors

作者：Kusko C^*; Zhai Z; Hakim N; Markiewicz RS; Sridhar S; Colson D; Viallet Guillen V; Forget A; Nefyodov YA; Trunin MR; Kolesnikov NN; Maignan A; Daignere A; Erb A

来源：Physical Review B, 2002, 65(13): 132501.

DOI：10.1103/PhysRevB.65.132501

The microwave surface impedance Z(s) = R-s + iX(s) of HgBa2Ca2Cu3O8+delta, HgBa2CuO4+delta, Tl2Ba2CuO6+delta, and underdoped YBa2Cu3O6.5 is found to be anomalous in that R-s(T>T-c) not equal X-s(T>T-c) in the pseudogap state. This implies plasmonlike response and negative permittivities epsilon'(omega)<0 at microwave frequencies indicating non-Fermi-liquid transport in the ab plane. The anomalous microwave response is shown to arise from a collective mode characterized by a plasma frequency ω(pCM)&SIM;0.1 eV and extremely low damping &UGamma;(CM)&SIM;10(-5)-10(-4) eV, distinctly different from those observed at optical frequencies.

• 出版日期2002-4-1
• 单位东北大学