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

Shimizu, Yasuhiro; Takeda, Hikaru; Tanaka, Midori; Itoh, Masatoshi; Niitaka, Seiji; Takagi, H.

doi:10.1038/ncomms1979

Cited by 38 publications

(31 citation statements)

References 27 publications

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“…There the formal valence of V ion is 3.5, and the one of Fe on B sites is 2.5 (the valence of Fe ions on A sites is 3), i.e., they have to exist in equal combinations of V 3+ and V 4+ , or Fe 2+ and Fe 3+ . Notice, however, that recent studies contradict the direct application of the ice (tetrahedron) rule to LiV 2 O 4 and Fe 3 O 4 [61,62,63,64,65,66,67,68,69,70,71,72,73,74,75]. For the recent reviews on spinel materials consult, e.g., [76,77,78,79].…”

Section: Ice Modelsmentioning

confidence: 99%

“…Among spinels with different cations at B-sites we can distinguish the situation, in which the valency of ions is different from integer, like in the first non-rare-earth based heavy-fermion system LiV 2 O 4 see, e.g., [61,62,63,64,65,66,67,68,69,70], or in, probably, the oldest known magnetic material, magnetite, Fe 3 O 4 see, e.g., [1,58,59]. There the formal valence of V ion is 3.5, and the one of Fe on B sites is 2.5 (the valence of Fe ions on A sites is 3), i.e., they have to exist in equal combinations of V 3+ and V 4+ , or Fe 2+ and Fe 3+ .…”

Section: Ice Modelsmentioning

confidence: 99%

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New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

Zvyagin

2013

Low Temperature Physics

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During recent years the interest to frustrated magnets has grown considerably. Such systems reveal very peculiar properties which distinguish them from standard paramagnets, magnetically ordered regular systems (like ferro-, ferri-, and antiferromagnets), or spin glasses. In particular great amount of attention has been devoted to the socalled spin ices, in which magnetic frustration together with the large value of the single-ion magnetic anisotropy of a special kind, yield peculiar behavior. One of the most exciting features of spin ices is related to low-energy emergent excitations, which, from many viewpoints can be considered as analogies of Dirac's monopoles. In this article we review the main achievements of theory and experiment in this field of physics.

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Section: Ice Modelsmentioning

confidence: 99%

Section: Ice Modelsmentioning

confidence: 99%

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

Zvyagin

2013

Low Temperature Physics

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“…Instead, powder inelastic neutron scattering (INS), nuclear magnetic resonance, and muon spin resonance (μSR) detect spin fluctuations below ∼80 K down to 20 mK, which increase to antiferromagnetic (AF) short-range fluctuations described by Q ≃ 0.6 Å −1 below T Ã [7][8][9], where the magnitude of the momentum p ¼ ℏQ. The 0.6-Å −1 nesting structure is also obtained by band calculations [10].…”

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confidence: 97%

Spin-Orbit Fluctuations in Frustrated Heavy-Fermion MetalLiV2O4

et al. 2014

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Spin fluctuations were studied over a wide momentum (ℏQ) and energy (E) space in the frustrated d-electron heavy-fermion metal LiV_{2}O_{4} by time-of-flight inelastic neutron scattering. We observed the overall Q-E evolutions near the characteristic Q=0.6 Å^{-1} peak and found another weak broad magnetic peak around 2.4 Å^{-1}. The data are described by a simple response function, a partially delocalized magnetic form factor, and antiferromagnetic short-range spatial correlations, indicating that heavy-fermion formation is attributable to spin-orbit fluctuations with orbital hybridization.

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“…29,30 Alternatively, multiple peaks observed for B 0 ||θ 0 become single above 450 K. A difference of T c in the two measurements arises from thermal hysteresis of the first-order transition. Such a switching of the magic angle indicates a change in the symmetry axis of the d orbital across T c .…”

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confidence: 99%

Orbital reformation with vanadium trimerization ind2triangular lattice LiVO2revealed by51V NMR

et al. 2013

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LiVO 2 is a model system of the valence bond solid (VBS) in 3d 2 triangular lattice. The origin of the VBS formation has remained controversial. We investigate the microscopic mechanism by elucidating the d orbital character via on-site 51 V NMR measurements in a single crystal up to 550 K across a structural transition temperature T c . The Knight shift, K, and nuclear quadrupole frequency, δν, show that the 3d orbital with local trigonal symmetry are reconstructed into a d yz d zx orbital order below T c . Together with the NMR spectra with three-fold rotational symmetry, we confirm a vanadium trimerization with d-d σ bonds. The Knight shift extracts the large Van-Vleck orbital susceptibility, χ VV = 3.6 × 10 −4 , in a paramagnetic state above T c , which is comparable to the spin susceptibility. The results suggest that orbitally induced Peierls transition in the proximity of the frustrated itinerant state is the dominant driving force of the trimerization transition. PACS numbers: 71.30.+h, 75.40.Gb Valence bond ordering in two-and three-dimensional systems is a manifestation of geometrical frustration.1 Across Mott transition, a valence bond solid (VBS) phase resides nearby unconventional metal 2,3 and superconducting phases 3 in triangular lattice systems. The VBS transition can accompany by d orbital orders with versatile textures, depending on lattice geometry and band filling. 4-9 However, d orbital orders governed by frustrated intersite interactions are not apparent from lattice distortions and need to be detected by microscopic probes. Here we show a tool for detailed characterization of d 2 orbital ordering in a model material LiVO 2 with the triangular lattice.ABX 2 (A:alkali metal; B: transition metal; X: chalcogen ion) with an ordered lock-type structure is a prototype of triangular-lattice antiferromagnet. 9 For Ti 3+ and V 3+ , t 2g orbital degrees of freedom play crucial roles in determining magnetic ground states. Among ABX 2 , LiVO 2 has been extensively investigated as a candidate of VBS.10-14 The crystal structure is comprised of the triangular lattice of V 3+ (3d 2 ) ions in a rhombohedral R3c structure [ Fig. 1(a)]. A trigonal elongation of VO 6 along the c axis splits the t 2g sublevel into a lower a 1g singlet and an upper e15 Calculated orbital occupations are almost equivalent in the a 1g and e ′ g orbitals due to the small trigonal field of 25 meV compared to the bandwidth.15 Below a first-order structural transition temperature T c ∼ 450-500 K, a superlattice Fig. 1(a)] appears in x-ray and electron diffraction measurements.11-14 Recent pair distribution function analyses of synchrotron data propose lowersymmetry lattice distortions depending on the layers. 16 Although the way of displacements of vanadium ions is compatible to trimerization, 12,13,16 the orbital character has not been accessible by the diffraction measurements due to Li deficiency and crystal twinning. Thus, the origin of the spin-singlet state in LiVO 2 remains controversial and to be elucidated via direct obse...

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

Cited by 38 publications

References 27 publications

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

Spin-Orbit Fluctuations in Frustrated Heavy-Fermion MetalLiV2O4

Orbital reformation with vanadium trimerization ind2triangular lattice LiVO2revealed by51V NMR

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