An orbital-selective spin liquid in a frustrated heavy fermion spinel LiV2O4

Yasuhiro Shimizu (), Hikaru Takeda, Moe Tanaka, Masayuki Itoh, Seiji Niitaka and Hidenori Takagi
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Yasuhiro Shimizu: Graduate School of Science, Nagoya University
Hikaru Takeda: Graduate School of Science, Nagoya University
Moe Tanaka: Graduate School of Science, Nagoya University
Masayuki Itoh: Graduate School of Science, Nagoya University
Seiji Niitaka: RIKEN Advanced Science Institute
Hidenori Takagi: RIKEN Advanced Science Institute

Nature Communications, 2012, vol. 3, issue 1, 1-5

Abstract: Abstract The pronounced enhancement of the effective mass is the primary phenomenon associated with strongly correlated electrons. In the presence of local moments, the large effective mass is thought to arise from Kondo coupling, the interaction between itinerant and localized electrons. However, in d electron systems, the origin is not clear because of the competing Hund's rule coupling. Here we experimentally address the microscopic origin for the heaviest d fermion in a vanadium spinel LiV2O4 having geometrical frustration. Utilizing orbital-selective 51V NMR, we elucidate the orbital-dependent local moment that exhibits no long-range magnetic order despite persistent antiferromagnetic correlations. A frustrated spin liquid, Hund-coupled to itinerant electrons, has a crucial role in forming heavy fermions with large residual entropy. Our method is important for the microscopic observation of the orbital-selective localization in a wide range of materials including iron pnictides, cobaltates, manganites and ruthnates.

Date: 2012
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DOI: 10.1038/ncomms1979

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