Tunnel effects in polyatomic systems with electronic degeneracy and pseudodegeneracy

Берсукер, И. Б.; Vekhter, B.J.; Ogurtsov, I. Ya.

doi:10.1070/pu1975v018n08abeh004913

Cited by 28 publications

(23 citation statements)

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“…This emergent six-fold g-factor anisotropy cannot be understood simply based on the theory for the single-ion dynamic JT effect [27][28]. Is it the fingerprint of a spin-orbital entangled state, where Cu spins form fluctuated singlet dimers which drive the dynamical Jahn Teller effect?…”

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confidence: 99%

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Observation of the orbital quantum dynamics in the spin-12hexagonal antiferromagnetBa3CuSb2
Han
¹
,
Hagiwara
²
,
Nakano
³

et al. 2015
Phys. Rev. B
21
3
31
0
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Abstract:We explore orbital dynamics in the spin liquid candidate Ba 3 CuSb 2 O 9 using multi-frequency electron spin resonance. We prepared two high quality single crystals. The crystal with a slight copper deficiency shows a structural phase transition at around 200 K due to the cooperative Jahn-Teller effect, accompanied with orbital ordering. In contrast, the crystal with almost perfect stoichiometry shows no orbital ordering down to the lowest temperature of 1.5 K. Dramatic change in the g-factor anisotropy as a function of frequency and temperature demonstrates orbital quantum fluctuations at a nearly constant time scale of ~ 100 ps below 20 K, evidencing the emergence of an orbital liquid state in this quantum spin liquid compound.

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confidence: 99%

“…Using single ion approximation [28], we estimate the characteristic frequency of the dynamic JT effect  JT by the relation  JT =  C g 2 /g 1 ≈ 0.095* C [20]. As shown in Fig.…”

mentioning

confidence: 99%

Observation of the orbital quantum dynamics in the spin-12hexagonal antiferromagnetBa3CuSb2
Han
¹
,
Hagiwara
²
,
Nakano
³

et al. 2015
Phys. Rev. B
21
3
31
0
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“…To summarize, it is worth to note that in classical papers (e.g. [4]) the cooperative JahnTeller pseudoeect is explained as a result of ordering of local distortions of the dipole-unstable unit cells. This part of the theory is described with accounting of the site symmetry of the JahnTeller centers, while the interaction between these centers is modeled without taking into account the crystal symmetry.…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, the vibronic coupling is a mechanism of the ferroelectric order-disorder phase transition in wide band-gap crystals with JahnTeller's centers. However, in this case one deals with a cooperative JahnTeller eect, in contrast to the JahnTeller eect in molecules [4]. The interaction in wide band-gap crystals, like in narrow band-gap ones, is observed mainly between the nearby electron states, or degenerate states which form the top of the valence band.…”

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confidence: 99%

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Electron-Phonon Interaction as a Mechanism of Phase Transition in the CuInP₂S₆Crystal

Bercha¹,

Bercha²,

Глухов³

et al. 2014

Acta Phys. Pol. A

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Studies on the phases of CuInP2S6 crystal exhibiting phase transitions of the order-disorder type are performed.A possibility for the cooperative JahnTeller eect to occur in this crystal is analyzed. For this purpose, the procedure of constructing the potential energy matrix is generalized for the case of crystal and it is illustrated by the construction of the adiabatic potentials for Γ5−Γ5 vibronic coupling for the proto-and paraelectric phases of CuInP2S6. The structure of the obtained potentials is analyzed together with the discussion on the appearance of spontaneous polarization in this crystal.

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Electron‐Lattice Interaction Parameters Determined from Absorption and MCD Spectra of the F Centers in CsCl and CsBr

Muramatsu

1988

Physica Status Solidi (b)

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Electron-Lattice Interaction P a r a m e t e r s Determined from Absorption and MCD Spectra of the F Centers in CsCl and CsBr BY S. MURAMATSU Nearly twenty y e a r s ago, much attention was payed to optical properties of F centers in the cesium halides from a n interest in interplay between large spinorbit and electron-lattice interactions /1 to 4/. The moment method for analyzing the effect of applied perturbations on the properties of the p-like excited states of the F centers was developed by Henry et al. (HSS) /1/ and used to extract important information about the electron-lattice (EL) interaction.

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Tunnel effects in polyatomic systems with electronic degeneracy and pseudodegeneracy

Cited by 28 publications

References 1 publication

Observation of the orbital quantum dynamics in the spin-12hexagonal antiferromagnetBa3CuSb2
Han
¹
,
Hagiwara
²
,
Nakano
³

et al. 2015
Phys. Rev. B
21
3
31
0
View full text Add to dashboard Cite

Observation of the orbital quantum dynamics in the spin-12hexagonal antiferromagnetBa3CuSb2
Han
¹
,
Hagiwara
²
,
Nakano
³

et al. 2015
Phys. Rev. B
21
3
31
0
View full text Add to dashboard Cite

Electron-Phonon Interaction as a Mechanism of Phase Transition in the CuInP₂S₆Crystal

Electron‐Lattice Interaction Parameters Determined from Absorption and MCD Spectra of the F Centers in CsCl and CsBr

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Tunnel effects in polyatomic systems with electronic degeneracy and pseudodegeneracy

Cited by 28 publications

References 1 publication

Observation of the orbital quantum dynamics in the spin-12hexagonal antiferromagnetBa3CuSb2Han1, Hagiwara2, Nakano3 et al. 2015Phys. Rev. B213310View full textAdd to dashboardCite

Observation of the orbital quantum dynamics in the spin-12hexagonal antiferromagnetBa3CuSb2Han1, Hagiwara2, Nakano3 et al. 2015Phys. Rev. B213310View full textAdd to dashboardCite

Electron-Phonon Interaction as a Mechanism of Phase Transition in the CuInP2S6Crystal

Electron‐Lattice Interaction Parameters Determined from Absorption and MCD Spectra of the F Centers in CsCl and CsBr

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Resources

About

Observation of the orbital quantum dynamics in the spin-12hexagonal antiferromagnetBa3CuSb2
Han
¹
,
Hagiwara
²
,
Nakano
³

et al. 2015
Phys. Rev. B
21
3
31
0
View full text Add to dashboard Cite

Observation of the orbital quantum dynamics in the spin-12hexagonal antiferromagnetBa3CuSb2
Han
¹
,
Hagiwara
²
,
Nakano
³

et al. 2015
Phys. Rev. B
21
3
31
0
View full text Add to dashboard Cite

Electron-Phonon Interaction as a Mechanism of Phase Transition in the CuInP₂S₆Crystal