Tuning Crystal Field Potential by Orbital Dilution in Strongly Correlated d4 Oxides

Brzezicki, Wojciech; Forte, Filomena; Noce, Canio; Cuoco, Mario; Oleś, Andrzej M.

doi:10.1007/s10948-019-05386-0

Cited by 4 publications

(3 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hideo Aoki [92] This is a typical scenario near a Lifshitz transition for the appearing of a new Fermi surface spot described for organics [86] and predicted also for pressurized sulfur hydrides [93][94][95]. Advances on quantum mechanics of orbital physics which is today a hot topic have been obtained by Oleś group showing orbital dilution in d 4 oxides by tuning crystal field potential [96] and magnetic properties of crystalline and ferroelectric layered rare-earth-titanate by Kuznetsov et al [97]. Strain Induced orbital dynamics across the metal insulator transition in thin VO 2 films [98] provide further information on nanoscale phase separation in the correlation-driven insulator-metal transition in vanadium dioxide [99][100][101][102].…”

Section: The Superstripes 2019 Conferencementioning

confidence: 92%

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Bianconi

2020

J Supercond Nov Magn

View full text Add to dashboard Cite

While in XX century the theory of superconductivity has focused on a homogeneous metal with a rigid lattice which can be reduced to a single effective conduction band in the dirty limit. Today in the XXI century, the physics of superconductivity is focusing on complexity of quantum matter where novel quantum functionalities with lattice inhomogeneity at nanoscale (between 1 nm and 100 nm) and at mesoscopic scale (in the range 100-10000 nm), where the electronic structure need to be described by multiple Fermi surfaces and multiple gaps in the superconducting phase in the clean limit. The present issue of Journal of superconductivity and Novel magnetism collects papers presented at the

show abstract

Section: The Superstripes 2019 Conferencementioning

confidence: 92%

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Bianconi

2020

J Supercond Nov Magn

View full text Add to dashboard Cite

show abstract

“…Doping with Mn impurities leads to substitution of with configurations, having local S = 3/2 and without an orbital degree of freedom (doublon). It has been recently demonstrated that the – spin–orbital exchange driven by Coulomb correlations yields an orbital reconstruction around the impurity sites 24 , 25 . In particular it acts as an effective crystal field potential , which tends to promote the doublon to the ( , ) sector (see Fig.…”

Section: Theoretical Analysismentioning

confidence: 99%

Guiding antiferromagnetic transitions in Ca$$_{2}$$RuO$$_{4}$$

Porter

Forte

Granata

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Understanding and controlling the transition between antiferromagnetic states having different symmetry content with respect to time-inversion and space-group operations are fundamental challenges for the design of magnetic phases with topologically nontrivial character. Here, we consider a paradigmatic antiferromagnetic oxide insulator, Ca$$_{2}$$ 2 RuO$$_{4}$$ 4 , with symmetrically distinct magnetic ground states and unveil a novel path to guide the transition between them. The magnetic changeover results from structural and orbital reconstruction at the transition metal site that in turn arise as a consequence of substitutional doping. By means of resonant X-ray diffraction we track the evolution of the structural, magnetic, and orbital degrees of freedom for Mn doped Ca$$_{2}$$ 2 RuO$$_{4}$$ 4 to demonstrate the mechanisms which drive the antiferromagnetic transition. While our analysis focuses on a specific case of substitution, we show that any perturbation that can impact in a similar way on the crystal structure, by reconstructing the induced spin–orbital exchange, is able to drive the antiferromagnetic reorganization.

show abstract

“…The existence of the mixing Cr 3+ /Cr 4+ states in the octahedral oxygen co-ordinations of CuCrO 2 delafossite caused strong correlation for the orbitals and the spin degeneracy of the charge carriers as a result of the crystal field. 20 This influenced the thermopower property of the CuCrO 2 material. The transition delafossite oxide compounds formed a phase in the preparation temperature of 1000-1100 • C. 21 The specific significance of the mixed valence transition CuCrO 2 was applied in data storage, temperature sensors, thermoelectric, p-type transparent conducting devices, dye-sensitized solar cells, photoelectrodes, energy storage, and electrode for lithium-ion batteries.…”

Section: Introductionmentioning

confidence: 99%

The effect of phase transition of crednerite/delafossite CuMn₁₋_xCr_xO₂ on optical, thermal, and power factor properties

2021

View full text Add to dashboard Cite

This study aims to investigate the effect of the phase transition of CuMn 1−x Cr x O 2 compound on the Jahn-Teller effect which in turn affects the optical, thermal, and thermoelectric power factor properties. The CuMn 1−x Cr x O 2 samples were synthesized by a solid-state reaction method. The ab initio computation was applied to evaluate the electronic and optical properties in order to confirm the experiment data. The appearance of the phase transition from crednerite CuMnO 2 to delafossite CuCrO 2 was confirmed by X-ray diffraction (XRD) and the ab initio computation through displaying the mixed crednerite/delafossite phase; and, the existence of the Jahn-Teller effect was confirmed by the X-ray photoelectron spectroscopy (XPS) technique exhibiting the occurrence of mixedstate Mn 3+ /Mn 4+ ions. The results obtained from XRD, XPS, and the ab initio computation implied the decrease of the Jahn-Teller behavior with increased x content under the influence of the phase transition from the crednerite phase to the delafossite phase of CuMn 1−x Cr x O 2 . Surprisingly, the Jahn-Teller distortion reduction caused an increase in the energy gap of the optical property, electrical resistivity, and activation energy in thermally activated band conduction. The effect suffered the specific heat behavior by being separated into two groups of crednerite and delafossite, and enhanced the small polaron behavior by increasing the activation energy of thermally activated band conduction. The phase transition reduced the results of thermal conductivity, thermopower, and thermoelectric power factor properties. In other words, the effect of the phase transition from the crednerite CuMnO 2 phase to the delafossite CuCrO 2 phase on CuMn 1−x Cr x O 2 compound reduced the Jahn-Teller effect with increased

show abstract

Tuning Crystal Field Potential by Orbital Dilution in Strongly Correlated d4 Oxides

Cited by 4 publications

References 55 publications

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Guiding antiferromagnetic transitions in Ca$$_{2}$$RuO$$_{4}$$

The effect of phase transition of crednerite/delafossite CuMn₁₋_xCr_xO₂ on optical, thermal, and power factor properties

Contact Info

Product

Resources

About

Tuning Crystal Field Potential by Orbital Dilution in Strongly Correlated d4 Oxides

Cited by 4 publications

References 55 publications

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Superconductivity in Quantum Complex Matter: the Superstripes Landscape

Guiding antiferromagnetic transitions in Ca$$_{2}$$RuO$$_{4}$$

The effect of phase transition of crednerite/delafossite CuMn1−xCrxO2 on optical, thermal, and power factor properties

Contact Info

Product

Resources

About

The effect of phase transition of crednerite/delafossite CuMn₁₋_xCr_xO₂ on optical, thermal, and power factor properties