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Deisenhofer, J.; Еремина, Р. М.; Pimenov, A.; Гаврилова, Т. П.; Berger, H.; Johnsson, Mats; Lemmens, P.; Nidda, H.-A. Krug von; Loidl, A.; Lee, K.-S.; Whangbo, Myung‐Hwan

doi:10.1103/physrevb.74.174421

Cited by 55 publications

(71 citation statements)

References 42 publications

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“…As expected, θ = 7.7(2) K is a small energy scale, expressing the correlation among the orphan spins. The values for the exchange constants, J a /k B ≈ 200 K and J b ≈ 0.65J a , are close to values determined for others 3D spin-gap systems [26,27]. The size of J b is of the correct magnitude to be effective in decreasing the magnetic response of the trimer.…”

Section: B Susceptibilitysupporting

confidence: 50%

“…However, it is certain that ∆/k B = 3832(92) K is a much too high energy scale to be associated with phonons. This situation was associated with different Jahn-Teller distortions, which are close in energy [26]. Hence, ∆/k B = 3832(92) K would correspond to the energy barrier separating two Jahn-Teller distortions.…”

Section: Electron Spin Resonancementioning

confidence: 99%

“…Experiments on single crystals would allow a proper investigation of the anisotropy of the ESR parameters which would be great importance to confirm the existence of dimers and trimers in the system [26].…”

Section: Electron Spin Resonancementioning

confidence: 99%

“…( b ) mediate temperatures with energy scales given by the exchange constants J a and J b [26][27][28].…”

Section: Electron Spin Resonancementioning

confidence: 99%

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Magnetic dimers and trimers in the disorderedS=32spin systemBaTi1/2Mn1/

Garcia¹,

Kaneko

Granado

et al. 2015

Phys. Rev. B

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We report a structural/magnetic investigation by X-ray absorption spectroscopy (XAS), neutron diffraction, dc-susceptibility (χ dc ) and electron spin resonance (ESR) of the 12R-type perovskite BaTi 1/2 Mn 1/2 O3. Our structural analysis by neutron diffraction supports the existence of structural trimers with chemically disordered occupancy of Mn 4+ and Ti 4+ ions, with the valence of the Mn ions confirmed by the XAS measurements. The magnetic properties are explored by combining dc-susceptibility and X-band (9.4 GHz) electron spin resonance, both in the temperature interval of 2 ≤ T ≤ 1000 K. A scenario is presented under which the magnetism is explained by considering magnetic dimers and trimers, with exchange constants Ja/kB = 200(2) K and J b /kB = 130(10) K, and orphan spins. Thus, BaTi 1/2 Mn 1/2 O3 is proposed as a rare case of an intrinsically disordered S = 3/2 spin gap system with a frustrated ground state.

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Section: B Susceptibilitysupporting

confidence: 50%

Section: Electron Spin Resonancementioning

confidence: 99%

Section: Electron Spin Resonancementioning

confidence: 99%

“…( b ) mediate temperatures with energy scales given by the exchange constants J a and J b [26][27][28].…”

Section: Electron Spin Resonancementioning

confidence: 99%

See 2 more Smart Citations

Magnetic dimers and trimers in the disorderedS=32spin systemBaTi1/2Mn1/

Garcia¹,

Kaneko

Granado

et al. 2015

Phys. Rev. B

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“…of an isolated spin-1/2 dimer with coupling constant J ⊥ [71][72][73], which is activated at low T by the gap ∆ = J ⊥ , has a broad peak at approximately T = 0.62J ⊥ , and falls very slowly to high temperatures. The susceptibility of the unfrustrated ladder [ Fig.…”

Section: B Analytical Thermodynamic Approximationsmentioning

confidence: 99%

Thermodynamic properties of highly frustrated quantum spin ladders: Influence of many-particle bound states

et al. 2016

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Quantum antiferromagnets have proven to be some of the cleanest realizations available for theoretical, numerical, and experimental studies of quantum fluctuation effects. At finite temperatures, however, the additional effects of thermal fluctuations in the restricted phase space of a low-dimensional system have received much less attention, particularly the situation in frustrated quantum magnets, where the excitations may be complex collective (bound or even fractionalized) modes. We investigate this problem by studying the thermodynamic properties of the frustrated two-leg S = 1/2 spin ladder, with particular emphasis on the fully frustrated case. We present numerical results for the magnetic specific heat and susceptibility, obtained from exact diagonalization and quantum Monte Carlo studies, which we show can be rendered free of the sign problem even in a strongly frustrated system and which allow us to reach unprecedented sizes of L = 200 ladder rungs. We find that frustration effects cause an unconventional evolution of the thermodynamic response across the full parameter regime of the model. However, close to the first-order transition they cause a highly anomalous reduction in temperature scales with no concomitant changes in the gap; the specific heat shows a very narrow peak at very low energies and the susceptibility rises abruptly at extremely low temperatures. Unusually, the two quantities have different gaps over an extended region of the parameter space. We demonstrate that these results reflect the presence of large numbers of multi-particle bound-state excitations, whose energies fall below the one-triplon gap in the transition region.

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