%0 Journal Article
%A Santoso, Iman
%A Ku, Wei
%A Shirakawa, Tomonori
%A Neuber, Gerd
%A Yin, Xinmao
%A Enoki, M.
%A Fujita, Masaki
%A Liang, Ruixing
%A Venkatesan, T.
%A Sawatzky, George A.
%A Kotlov, Aleksei
%A Yunoki, Seiji
%A Rübhausen, Michael
%A Rusydi, Andrivo
%T Unraveling Local Spin Polarization of Zhang-Rice Singlet in Lightly Hole-Doped Cuprates Using High-Energy Optical Conductivity
%J Physical review / B
%V 95
%N 16
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M PUBDB-2017-01533
%P 165108
%D 2017
%X Unrevealing local magnetic and electronic correlations in the vicinity of charge carriers is crucial in order tounderstand rich physical properties in correlated electron systems. Here, using high-energy optical conductivity(up to 35 eV) as a function of temperature and polarization, we observe a surprisingly strong spin polarizationof the local spin singlet with enhanced ferromagnetic correlations between Cu spins near the doped holesin lightly hole-doped La<sub>1.95</sub>Sr<sub>0.05</sub>Cu<sub>0.95</sub>Zn<sub>0.05</sub>O<sub>4</sub>. The changes of the local spin polarization manifest stronglyin the temperature-dependent optical conductivity at ∼7.2 eV, with an anomaly at the magnetic stripe phase(∼ 25 K), accompanied by anomalous spectral-weight transfer in a broad energy range. Supported by theoreticalcalculations, we also assign high-energy optical transitions and their corresponding temperature dependence,particularly at ∼2.5, ∼8.7, ∼9.7, ∼11.3, and ∼21.8 eV. Our result shows the importance of a strong mixture ofspin singlet and triplet states in hole-doped cuprates and demonstrates a new strategy to probe local magneticcorrelations using high-energy optical conductivity in correlated electron systems.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000402740100001
%R 10.1103/PhysRevB.95.165108
%U https://bib-pubdb1.desy.de/record/320128