The magnetic, spectroscopic and thermal properties of KDyMo<sub>2</sub>O<sub>8</sub>

Cooke, A H; Davidson, M M; England, N.J.; Leask, M. J. M.; Lowry, J B; Tropper, A.C.; Wells, M. R.

doi:10.1088/0022-3719/9/20/005

Cited by 24 publications

(17 citation statements)

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“…To explain that gapped behavior a 1D spin subsystem with staggered effective g factors has been stadied [5,13,14]. The low-temperature, low-field electron spin resonance (ESR) [4,[6][7][8][9] exhibited two inequivalent magnetic centers. On the other hand, the higher-field ESR treatment reported only a single magnetic center [15].…”

Section: Received July 25 2000mentioning

confidence: 99%

“…The essence of our study is following. Let the configuration of ligands, which surround two neighboring magnetic ions along the chain direction, possesses small shifts (distortions) of opposite signs (antiferrodistortions [8]). Such distortions will immediately produce a change of the crystalline electric fields of the ligands.…”

Section: Received July 25 2000mentioning

confidence: 99%

“…Some of magnetic compounds with the essential coupling between spin, orbital, and elastic subsystems manifest paramagnetic spin behavior with two essentially inequivalent magnetic centers at low temperatures (which are higher, though, than the temperature of the phase transition to magnetically ordered 3D state). Often the latter has not been observed [4][5][6][7][8][9]. For higher temperatures the inequivalence between the two magnetic centers smears out.…”

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confidence: 99%

“…Low-lying spin excitations are gapless for these low-dimensional systems in the absence of an external magnetic field. However,in an external field the lowtemperature specific heat of some of those systems reveals the emergence of a spin gap induced by an external magnetic field [8,11,12]. To explain that gapped behavior a 1D spin subsystem with staggered effective g factors has been stadied [5,13,14].…”

mentioning

confidence: 99%

“…For higher temperatures the inequivalence between the two magnetic centers smears out. The presence of inequivalent magnetic centers in low-dimensional quantum spin systems is usually connected with slightly different local surrounding of two types of magnetic ions and involves either staggered g factors of the magnetic ions [4] (another case pertains to two anisotropic g tensors canted with respect to the principal axis [8] or the Dzyaloshinskii-Moriya coupling in crystals without mirror magnetic symmetry [10]. Low-lying spin excitations are gapless for these low-dimensional systems in the absence of an external magnetic field.…”

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confidence: 99%

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Magnetoelastic effects in low-dimensional magnetic systems

Zvyagin

Zvyagina

2001

Low Temperature Physics

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We consider a new realization of magnetoelastic interactions in low-dimensional magnetic systems. We show that low-dimensional spin systems are unstable with respect to the spontaneous appearance of alternating distortions of the positions of the three-dimensional nonmagnetic atoms (ligands), that surround the magnetic ions. Those distortions are supplemented by the spontaneous onset of alternating effective g factors of the magnetic ions in the phase with short-range interactions. We discuss the possibility of observing the effect in an uniform external magnetic field, which in the situation considered produces both magnetization and staggered magnetization of the magnetic subsystem. The connection of the proposed theory with recent experiments on effectively low-dimensional magnetic systems (organic spin chains, heavy-fermion compounds, rare-earth molybdates) is discussed. PACS: 75.10.Jm, 71.70.Fk, 71.70.Ej Interest in electron systems with substantial coupling between the charge, spin, and orbital degrees of freedom of the electronic and elastic subsystems of a crystal has grown considerably during the last decade. The prime examples of the manifestation of such cooperative effects are the phenomena of collosal magnetoresistance of manganites, non-Fermiliquid behavior of some heavy-fermion compounds, spin-Peierls and charge ordering behaviors in inorganic systems and unconventional superconductivity [1]. The Jahn-Teller effect [2] is probably the oldest known manifestation of such a coupling. Here the degeneracy of the orbital states of a molecule is removed by the deformation of the latter. The cooperative Jahn-Teller effect reveals itself in a structural phase transition. It has been observed in a number of compounds [3]. In the spin-Peierls transition also the degeneracy of the electronic (spin, not orbital) subsystem of a onedimensional (1D) spin chain is removed due to the coupling with a longitudinal phonon of the 3D crystal lattice. A spin gap is opened for the lowlying spin excitation. On the other hand, the corresponding phonon mode possesses softening (Kohn anomaly). Some of magnetic compounds with the essential coupling between spin, orbital, and elastic subsystems manifest paramagnetic spin behavior with two essentially inequivalent magnetic centers at low temperatures (which are higher, though, than the temperature of the phase transition to magnetically ordered 3D state). Often the latter has not been observed [4][5][6][7][8][9]. For higher temperatures the inequivalence between the two magnetic centers smears out. The presence of inequivalent magnetic centers in low-dimensional quantum spin systems is usually connected with slightly different local surrounding of two types of magnetic ions and involves either staggered g factors of the magnetic ions [4] (another case pertains to two anisotropic g tensors canted with respect to the principal axis [8] or the Dzyaloshinskii-Moriya coupling in crystals without mirror magnetic symmetry [10]. Low-lying spin excitations are gapless for these low-di...

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Section: Received July 25 2000mentioning

confidence: 99%

Section: Received July 25 2000mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Magnetoelastic effects in low-dimensional magnetic systems

Zvyagin

Zvyagina

2001

Low Temperature Physics

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Metamagnetoelastic and Metamagnetoelectric Behaviour of the Jahn‐Teller Antiferroelastics

Kaplan

1982

Physica Status Solidi (b)

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It is shown. that the magnetic field induced structural phase transition from the antiferrodistortional to the ferrodistortional phase is possible in Jahn-Teller antiferroelastics. The phase transition under consideration is simultaneously the crystal transition from the ferroelectric into the antiferroelectric state. The anomalously sharp change of the crystal strain and polarization is realized in the rmge of the critical magnetic fields. Such a behaviour of crystal strain and poliuiLation is nnmcd metamagnetoelasticity and metamagnetoelectricity, respectively. The properties of the ESR spectra of the system under consideration are analysed. The possibilities of experimental observation of the predicted effects are discussed.

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