Magnetic field effect on Fe-induced short-range magnetic correlation and electrical conductivity in Bi 1.75 Pb 0.35 Sr 1.90 </mml:mrow…
2010; American Physical Society; Volume: 82; Issue: 6 Linguagem: Inglês
10.1103/physrevb.82.064507
ISSN1550-235X
AutoresShuichi Wakimoto, Haruhiro Hiraka, K. Kudo, D. Okamoto, Terukazu Nishizaki, Kazuhisa Kakurai, Tao Hong, A. Zheludev, J. M. Tranquada, Norio Kobayashi, Kazuyoshi Yamada,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoWe report electrical resistivity measurements and neutron diffraction studies under magnetic fields of Bi$_{1.75}$Pb$_{0.35}$Sr$_{1.90}$Cu$_{0.91}$Fe$_{0.09}$O$_{6+y}$, in which hole carriers are overdoped. This compound shows short-range incommensurate magnetic correlation with incommensurability $\delta=0.21$, whereas a Fe-free compound shows no magnetic correlation. Resistivity shows an up turn at low temperature in the form of $ln(1/T)$ and shows no superconductivity. We observe reduction of resistivity by applying magnetic fields (i.e., a negative magnetoresistive effect) at temperatures below the onset of short-range magnetic correlation. Application of magnetic fields also suppresses the Fe induced incommensurate magnetic correlation. We compare and contrast these observations with two different models: 1) stripe order, and 2) dilute magnetic moments in a metallic alloy, with associated Kondo behavior. The latter picture appears to be more relevant to the present results.
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