Theoretical and experimental developments in quantum spin liquid in geometrically frustrated magnets: a review

Shaginyan, V. R.; Stephanovich, V. A.; Msezane, A. Z.; Japaridze, G. S.; Clark, John W.; Amusia, M. Ya.; Кириченко, Е. В.

doi:10.1007/s10853-019-04128-w

Cited by 25 publications

(37 citation statements)

References 117 publications

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“…In Os 0.55 Cl 2 it may be that a low concentration of local structural arrangements associated with the distribution of trivalent, tetravalent, and vacant Os sites produce Schottky anomalies with more complicated energy level schemes and degeneracies that are responsible for the observed behavior, although the power law temperature dependence below the peak noted below may argue against this. Comparing the data in Figure 5a-c with the literature reveals behavior particularly similar to the quantum spin liquids ZnCu 3 (OH) 6 Cl 2 43,49 and YbMgGaO 4 44,45 .…”

Section: Resultssupporting

confidence: 65%

Chemical disorder and spin-liquid-like magnetism in the van der Waals layered 5d transition metal halide Os0.55Cl2

et al. 2019

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Single crystals of the van der Waals layered 5d transition metal compound Os0.55Cl2 were grown and characterized by x-ray diffraction, magnetization and heat capacity measurements, and atomic resolution electron microscopy. The crystals are stable in air and easily cleaved. The structure is derived from the CdCl 2 structure type, with triangular layers of transition metal sites coordinated by edge sharing octahedra of Cl and separated by a van der Waals gap. On average only 55% of the metal sites are occupied by Os, and evidence for short and long ranged vacancy order is observed by diffraction and real space imaging. Magnetization data indicate magnetocrystalline anisotropy due to spin-orbit coupling, antiferromagnetic correlations, and no sign of magnetic order or spin freezing down to 0.4 K. Heat capacity measurements in applied magnetic fields show only a broad, field-dependent anomaly. The magnetic susceptibility and heat capacity obey power laws at low temperature and low field with exponents close to 0.5. The power law behaviors of the low-temperature heat capacity and magnetic susceptibility suggest gapless magnetic fluctuations prevent spin freezing or ordering in Os0.55Cl2. Divergence of the magnetic Gruneisen parameter indicate nearness to a magnetic quantum critical point. Similarities to behaviors of spin liquid materials are noted, and in total the results suggests Os0.55Cl2 may be an example of a quantum spin liquid in the limit of strong chemical disorder.

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Section: Resultssupporting

confidence: 65%

Chemical disorder and spin-liquid-like magnetism in the van der Waals layered 5d transition metal halide Os0.55Cl2

et al. 2019

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“…We note that the same behavior is seen in the frustrated magnet ZnCu 3 (OH) 6 Cl 2 , which hosts a quantum spin liquid and demonstrates LFL behavior at T < 400 mK [35]. The scaling behavior is expected to be violated in the LFL region, whereas it would be restored with growing temperatures T > 400 mK [36,37]. It is seen from Fig.…”

Section: Violation Of Scaling Behaviorsupporting

confidence: 67%

Universal $T/B$ scaling behavior of heavy fermion compounds

Shaginyan,

Msezane,

Clark

et al. 2020

Preprint

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We address manifestations of T /B scaling behavior of heavy-fermion (HF) compounds, where T and B are respectively temperature and magnetic field. Using experimental data and the fermion condensation theory, we show that this scaling behavior is typical of HF compounds including HF metals, quasicrystals, and quantum spin liquids. We demonstrate that such scaling behavior holds down to the lowest temperature and field values, so that T /B varies in a wide range, provided the HF compound is located near the topological fermion condensation quantum phase transition (FCQPT). Due to the topological properties of FCQPT, the effective mass M * exhibits a universal behavior, and diverges as T goes to zero. We also explain how to extract the universal scaling behavior from experimental data collected on different heavy-fermion compounds. As an example, we consider the HF metal YbCo2Ge4, and show that its scaling behavior is violated at low temperatures. Our results obtained show good agreement with experimental facts.

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“…We argue here, that existing microscopic approaches,-based either on model calculations within Hubbard and Kondo models or simulations (constructed actually from more sophisticated versions of the latter models) cannot describe adequately the appearance and destruction of asymmetric conductivity in solids. We speculate that the presented FC theory, which is based on general topological and symmetry arguments, can be well considered to be a candidate to explain not only the above discussed but many other properties of seemingly different physical objects from a uniform point of view [1,[11][12][13][14]19,[50][51][52]. To the best of our knowledge, the effective theories of gravity, even their quantum versions, cannot explain the baryon asymmetry, the existence of time arrow, the large entropy and other yet unexplained problems of contemporary cosmology and large-scale astronomy.…”

Section: Discussionmentioning

confidence: 99%

Violation of the Time-Reversal and Particle-Hole Symmetries in Strongly Correlated Fermi Systems: A Review

et al. 2020

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In this review, we consider the time reversal T and particle-antiparticle C symmetries that, being most fundamental, can be violated at microscopic level by a weak interaction. The notable example here is from condensed matter, where strongly correlated Fermi systems like heavy-fermion metals and high Tc superconductors exhibit C and T symmetries violation due to so-called non-Fermi liquid (NFL) behavior. In these systems, tunneling differential conductivity (or resistivity) is a very sensitive tool to experimentally test the above symmetry break. When a strongly correlated Fermi system turns out to be near the topological fermion condensation quantum phase transition (FCQPT), it exhibits the NFL properties, so that the C symmetry breaks down, making the differential tunneling conductivity to be an asymmetric function of the bias voltage V. This asymmetry does not take place in normal metals, where Landau Fermi liquid (LFL) theory holds. Under the application of magnetic field, a heavy fermion metal transits to the LFL state, and σ(V) becomes symmetric function of V. These findings are in good agreement with experimental observations. We suggest that the same topological FCQPT underlies the baryon asymmetry in the Universe. We demonstrate that the most fundamental features of the nature are defined by its topological and symmetry properties.

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Theoretical and experimental developments in quantum spin liquid in geometrically frustrated magnets: a review

Cited by 25 publications

References 117 publications

Chemical disorder and spin-liquid-like magnetism in the van der Waals layered 5d transition metal halide Os0.55Cl2

Chemical disorder and spin-liquid-like magnetism in the van der Waals layered 5d transition metal halide Os0.55Cl2

Universal $T/B$ scaling behavior of heavy fermion compounds

Violation of the Time-Reversal and Particle-Hole Symmetries in Strongly Correlated Fermi Systems: A Review

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