TY - JOUR
T1 - Development of Ferromagnetic Fluctuations in Heavily Overdoped (Bi,Pb)2Sr2CuO6+δ Copper Oxides
AU - Kurashima, Koshi
AU - Adachi, Tadashi
AU - Suzuki, Kensuke M.
AU - Fukunaga, Yasushi
AU - Kawamata, Takayuki
AU - Noji, Takashi
AU - Miyasaka, Hitoshi
AU - Watanabe, Isao
AU - Miyazaki, Masanori
AU - Koda, Akihiro
AU - Kadono, Ryosuke
AU - Koike, Yoji
N1 - Funding Information:
We thank A. Sakuma, Y. Shimizu, H. Tsuchiura, K. Ueda, and H. Yokoyama for informative discussions. We are indebted to M. Ishikuro for his help in the ICP analysis. measurements were partially supported by MEXT KAKENHI Grant No. 23108004 and by the KEK-MSL Inter-University Research Program (Proposals No. 2015A0198 and No. 2016B0121). K. K. thanks the Tohoku University Division for Interdisciplinary Advanced Research and Education for their financial support.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/8/1
Y1 - 2018/8/1
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.121.057002
DO - 10.1103/PhysRevLett.121.057002
M3 - Article
C2 - 30118284
AN - SCOPUS:85051531743
SN - 0031-9007
VL - 121
JO - Physical Review Letters
JF - Physical Review Letters
IS - 5
M1 - 057002
ER -