Studies of the structural stability of an electronic system with a two-fold degenerate band

Ghatak, S.K.; Ray, D.; Tannous, C.

doi:10.1103/physrevb.18.5379

Cited by 37 publications

(14 citation statements)

References 18 publications

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“…9 The importance of the Jahn-Teller effect in manganites is borne out by experimental evidence. 10 A model theoretical study demonstrates that the ferromagnetism and the Jahn-Teller distortion interfere destructively in the e g -band 11 and therefore it can change the resistive behavior. In this work we explore the influence of the Jahn-Teller splitting due to distortion that is induced by average size reduction of the R-ion on electronic transport properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Strain on the Transport Properties of the Manganite

Basak

Chaudhuri

Ghatak

2001

Int. J. Mod. Phys. B

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The effect of strain on the resistivity and thermopower of ferromagnetic manganites has been examined based on the model that incorporates the electron-lattice interaction through the Jahn-Teller effect and an effective hopping determined by nearest neighbor spin-spin correlation of t 2g electrons. The metal insulator transition temperature associated with resistivity decreases with increase in strain. In the presence of large strain the system remains in the semiconducting state. Thermopower (S) is positive and increasing function of strain and it exhibits a maximum with temperature. The temperature where maximum of S appears, shifts towards higher (lower) value in the presence of magnetic field (strain). A large magneto-thermopower that depends on strain is obtained around metal-insulator transition.

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Section: Introductionmentioning

confidence: 99%

Effect of Strain on the Transport Properties of the Manganite

Basak

Chaudhuri

Ghatak

2001

Int. J. Mod. Phys. B

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“…This is the result of band Jahn-Teller effect for two-fold degenerate in e g orbitals obtained earlier [20]. In this case orbital degeneracy is removed by distortion and can create a gap in DOS for δ > bandwidth.…”

Section: Pseudogap In the Normal Statementioning

confidence: 94%

Pseudogap and its influence on normal and superconducting states of cuprates

Chaudhuri¹,

Taraphder²,

Ghatak³

2001

Physica C: Superconductivity

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A model incorporating simultaneous superconducting and lattice instabilities has been studied in detail to estimate the nature of coupling and inter-play between them. The phase diagram is obtained in the temperature-filling plane at different values of the parameters of the model. It is found that a pseudogap develops in the distorted phase that inhibits the appearance of the superconducting transition. The superconducting instability is strongest for the regime of filling where the van Hove singularity in the 2D density of states is close to the chemical potential. The pseudogap, developed in the distorted phase, is a function of temperature via the temperature dependence of the distortion itself. Transport properties, namely resistivity and thermopower are found to be strongly dependent on the variations of the pseudogap.

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“…Therefore, it is expected that the Jahn-Teller distortion would interfere with the superconductivity in such a system. Based on the band Jahn-Teller effect, present in the e g conduction band of copper, the interplay between distortion and superconductivity has been reported earlier [18,19]. In this communication, we present a detailed study of the coexistence of superconductivity and band Jahn-Teller distortion in the two fold degenerate e g band in presence of the f-electron level of the impurity rare-earth ion and the hybridization between the f-electron level and the conduction band.…”

Section: Introductionmentioning

confidence: 90%

“…A common feature of cuprate systems is that there exists the orbital degeneracy in the ground state with the Fermi level located within the degenerate band. The distortion due to the structural transition lifts the orbital degeneracy of the valance band and the electron redistribution between the shifted bands lowers the electronic energy [18,19]. The transition occurs, if the lowering in electronic energy out weights the cost in elastic energy due to distortion.…”

Section: Introductionmentioning

confidence: 97%

“…The transition occurs, if the lowering in electronic energy out weights the cost in elastic energy due to distortion. It has been shown that the cubic to tetragonal transition is possible in narrow e g band systems where the density of states (DOS) at Fermi level in the cubic phase is large [18]. Associated with this transition there is a change in the DOS around the Fermi level.…”

Section: Introductionmentioning

confidence: 98%

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Effects of Jahn‐Teller distortion on the superconducting gap

Rout¹,

Pradhan²,

Behera³

2006

Phys. Status Solidi (c)

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In the present communication we propose a microscopic model to study the interplay between Jahn-Teller distortion and superconductivity in presence of impurity f-electron levels of rare-earth atoms and the hybridization between the impurity and the degenerate conduction electrons of Cu 2+ . The single particle electronic Green's functions are calculated by equations of motion and expressions for lattice strain (e) and superconducting gap (∆) are evaluated. The temperature dependence of ∆ and e are solved self-consistently by numerical methods. Both the gap parameters show mean-field behavior and very strong interaction between them. The superconducting order parameter is suppressed due to the presence of lattice distortion in the system and on the other hand the strain is suppressed in the temperature range of ∆. The effect of position of impurity level ( f )and the hybridization show many anomalous behavior.

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Studies of the structural stability of an electronic system with a two-fold degenerate band

Cited by 37 publications

References 18 publications

Effect of Strain on the Transport Properties of the Manganite

Effect of Strain on the Transport Properties of the Manganite

Pseudogap and its influence on normal and superconducting states of cuprates

Effects of Jahn‐Teller distortion on the superconducting gap

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