2001/08/14 by H. Kitano, Haruhisa Kitano, R. Inoue +12 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1209/epl/i2001-00537-2
published as Europhysics Letters, vol.56, 434 (2001) · 7 pages, 4 figure, to be published in Europhysics Letters
arxiv created 2001/08/14 · openalex publication_date 2001/11/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We have measured the temperature and frequency dependence of the microwave and millimeter wave conductivity σ 1 ( T ,ω) along both the ladder ( c -axis) and the leg ( a -axis) directions in Sr 14 Cu 24 O 41 . Below a temperature T * ( ∼ 170 K), we observed a stronger frequency dependence in σ 1 c ( T ,ω) than that in σ 1 a ( T ,ω), forming a small resonance peak developed between 30 GHz and 100 GHz. We also observed nonlinear dc conduction along the c -axis at rather low electric fields below T *. These results suggest some collective excitation contributes to the c -axis charge dynamics of the slightly hole-doped ladders of Sr 14 Cu 24 O 41 below T *.