Field-induced magnetism in the high-T_c superconductor Ca_2-xNa_xCuO₂Cl₂ with flat CuO₂ planes

2009/10/29 by K. Ohishi, Ohishi, K., I. Yamada +15
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.0910.5585

arxiv created 2009/10/29 · arxiv updated 2009/12/01

Abstract

The internal magnetic field distribution in a mixed state of a cuprate superconductor, Ca_2-xNa_xCuO₂Cl₂ (T_{\rm c}≃28.5 K, near the optimal doping), was measured by muon spin rotation (μSR) technique up to 60 kOe. The μSR linewidth Λ(B) which exhibits excess broadening at higher fields (B>5 kOe) due to field-induced magnetism (FIM), is described by a relation, Λ(B)∝√(B). This suggests that the orbital current and associated quasiparticle excitation plays predominant roles in stabilizing the quasistatic correlation. Moreover, a slowing down of the vortex fluctuation sets in well above T_{\rm c}, as inferred from the trace of FIM observed up to ∼80 K, and develops continuously without a singularity at T_{\rm c} as the temperature decreases.

Related

• Flux line lattice state versus magnetism in electron-doped cuprate superconductor Sr_1-xLa_xCuO₂
• Field-induced electronic phase separation in the high-temperature superconductor La_1.94Sr_0.06CuO_4+y
• Calculations of magnetic field produced by spin-vortex-induced loop currents in Bi₂Sr₂CaCu₂O_8+δ thin films using the particle-number conserving Bogoliubov-de Gennes formalism
• Discovery of slow magnetic fluctuations and critical slowing down in the pseudogap phase of YBa₂Cu₃O_y
• Muon spin rotation study of the intercalated graphite superconductor CaC6 at low temperatures