Journal Article

PUBDB-2017-01533

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Unraveling Local Spin Polarization of Zhang-Rice Singlet in Lightly Hole-Doped Cuprates Using High-Energy Optical Conductivity

Santoso, I. (Corresponding author)Extern* ; Ku, W. ; Shirakawa, T. ; Neuber, G.CFEL*Extern* ; Yin, X.Extern* ; Enoki, M. ; Fujita, M.Extern* ; Liang, R. ; Venkatesan, T. ; Sawatzky, G. A. ; Kotlov, A.DESY* ; Yunoki, S. ; Rübhausen, M. ; Rusydi, A.Extern*

2017
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevB.95.165108  doi:10.3204/PUBDB-2017-01533

Abstract: 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 $La_{1.95}Sr_{0.05}Cu_{0.95}Zn_{0.05}O_4$. 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.

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Contributing Institute(s):

1. DOOR-User (DOOR)
2. PETRA III Extension (FS-PEX)
3. UNI/INF (CFEL-AO)

Research Program(s):

1. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)

Experiment(s):

1. DORIS Beamline I (DORIS III)

Appears in the scientific report 2017

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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