Development of Ferromagnetic Fluctuations in Heavily Overdoped (Bi,Pb)2Sr2CuO6+δ Copper Oxides

Koshi Kurashima, Tadashi Adachi, Kensuke M. Suzuki, Yasushi Fukunaga, Takayuki Kawamata, Takashi Noji, Hitoshi Miyasaka, Isao Watanabe, Masanori Miyazaki, Akihiro Koda, Ryosuke Kadono, Yoji Koike

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Abstract

We demonstrate the presence of ferromagnetic (FM) fluctuations in the superconducting and nonsuperconducting heavily overdoped regimes of high-temperature superconducting copper oxides, using (Bi,Pb)2Sr2CuO6+δ (Bi-2201) single crystals. Magnetization curves exhibit a tendency to be saturated in high magnetic fields at low temperatures in the heavily overdoped crystals, which is probably a precursor phenomenon of a FM transition at a lower temperature. Muon spin relaxation detects the enhancement of spin fluctuations at high temperatures below 200 K. Correspondingly, the ab-plane resistivity follows a 4/3 power law in a wide temperature range, which is characteristic of metals with two-dimensional FM fluctuations due to itinerant electrons. As the Wilson ratio evidences the enhancement of spin fluctuations with hole doping in the heavily overdoped regime, it is concluded that two-dimensional FM fluctuations reside in the heavily overdoped Bi-2201 cuprates, which is probably related to the decrease in the superconducting transition temperature in the heavily overdoped cuprates.

Original languageEnglish
Article number057002
JournalPhysical Review Letters
Volume121
Issue number5
DOIs
Publication statusPublished - 2018 Aug 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kurashima, K., Adachi, T., Suzuki, K. M., Fukunaga, Y., Kawamata, T., Noji, T., Miyasaka, H., Watanabe, I., Miyazaki, M., Koda, A., Kadono, R., & Koike, Y. (2018). Development of Ferromagnetic Fluctuations in Heavily Overdoped (Bi,Pb)2Sr2CuO6+δ Copper Oxides. Physical Review Letters, 121(5), [057002]. https://doi.org/10.1103/PhysRevLett.121.057002