TY  - JOUR
AU  - Santoso, Iman
AU  - Ku, Wei
AU  - Shirakawa, Tomonori
AU  - Neuber, Gerd
AU  - Yin, Xinmao
AU  - Enoki, M.
AU  - Fujita, Masaki
AU  - Liang, Ruixing
AU  - Venkatesan, T.
AU  - Sawatzky, George A.
AU  - Kotlov, Aleksei
AU  - Yunoki, Seiji
AU  - Rübhausen, Michael
AU  - Rusydi, Andrivo
TI  - Unraveling Local Spin Polarization of Zhang-Rice Singlet in Lightly Hole-Doped Cuprates Using High-Energy Optical Conductivity
JO  - Physical review / B
VL  - 95
IS  - 16
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - PUBDB-2017-01533
SP  - 165108
PY  - 2017
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000402740100001
DO  - DOI:10.1103/PhysRevB.95.165108
UR  - https://bib-pubdb1.desy.de/record/320128
ER  -