Electron-phonon coupling in charge-transfer and crystal-field states of Jahn-Teller<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">CuCl</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mi mathvariant="normal">−</mml:mi></mml:mrow></mml:msubsup></mml:mrow></mml:math>systems

Valiente, Rafael; Rodrı́guez, F.

doi:10.1103/physrevb.60.9423

Cited by 75 publications

(97 citation statements)

References 35 publications

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“…The present estimate illustrates the relevance of the JahnTeller effect in stabilizing the low-spin (LS) state in CoCl 2 for pressures above 35 GPa, provided that the Jahn-Teller distortion in LS Co 2+ is not suppressed at such pressures. Evidence of Jahn-Teller suppression has been given for (CuCl 6 ) 4- [9,10] and (MnF 6 ) 3- [11,12] at pressures around 40 GPa, and thus the SCO pressure in CoCl 2 is high enough to eventually suppress the Jahn-Teller distortion and therefore maintain the HS 4 T 1 state at these pressures. However a relevant feature arising in this work (Fig.…”

Section: Results and Analysismentioning

confidence: 99%

“…However the Jahn-Teller energy is not known for Co 2+ in chlorides since the HS ground state does not show any Jahn-Teller distortion [6]. In order to estimate E JT , we can use the Jahn-Teller energy of (CuCl 6 ) 4-systems (E JT = 0.3 eV) as reference for (CoCl 6 ) 4- [9,10]. So that we obtain ∆ SCO = 1.3 eV taking E JT = 0.3 eV.…”

Section: Results and Analysismentioning

confidence: 99%

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On the pressure-induced spin transition in CoCl_2.interplay between Jahn-Teller effect and spin sate in Co²⁺

Hernández

Rodríguez

2008

J. Phys.: Conf. Ser.

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Abstract. This work investigates on the interplay between the Jahn-Teller effect and spin state in Co 2+ (3d 7 configuration). High-pressure optical absorption experiments were carried out in the 0 -50 GPa range in CoCl 2 . This system is attractive since pressure increases the crystalfield splitting between e g and t 2g levels from 0.9 eV to 1.6 eV, thus approaching CoCl 2 towards the high-spin-to-low-spin transition. The free energy associated with the two states is discussed in terms of crystal-field and stabilization energies due to lattice relaxation including the JahnTeller effect, which is expected to be particularly strong in the low-spin configuration ( 2 E;t 2g 6 e g 1 ) with respect to the weakly Jahn-Teller high-spin configuration ( 4 T 1 ; t 2g 5 e g 2 ). The metallization process observed above 40 GPa is discussed in terms of spin transition and charge-transfer states.

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Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

On the pressure-induced spin transition in CoCl_2.interplay between Jahn-Teller effect and spin sate in Co²⁺

Hernández

Rodríguez

2008

J. Phys.: Conf. Ser.

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“…They crystallize as layered self-assembled structures, consisting of layers of corner-sharing CuCl 6 octahedra (2D perovskite structures) sandwiched by (C n H 2n+1 NH 3 ) + alkylammonium cations. They are interesting for fundamental physics (Jahn-Teller distortion [1], two-dimentional ferromagnetism [2,3]), as well as for applications in organic-inorganic electronics and optical devices. In the last ten years increasing interest has been paid to these compounds.…”

Section: Introductionmentioning

confidence: 99%

Growth and characterization of hybrid (C_nH_2n+1NH₃)₂CuCl₄ self‐assembled films

Chiarella

Zappettini

Ferro

et al. 2005

Cryst. Res. Technol.

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Films of self-assembled (C n H 2n+1 NH 3 ) 2 CuCl 4 (1≤n≤4) hybrid structures were prepared and characterized with respect to the structure, the optical absorption and the transport properties. The films were deposited in-situ, by the Single Source Thermal Ablation (SSTA) procedure on glassy, crystalline and polymeric substrates. The film structure and the morphology, thickness and roughness were almost independent on the substrate. Xray diffraction analysis showed that the films are well crystallized and c-axis oriented. Optical absorption measurements in the 9000-52000 cm -1 interval confirmed the good quality of the films. They also proved that the absorption phenomena are mainly related to the inorganic CuCl 6 4-clusters and to their geometrical configuration. Due to the high optical quality of the films novel absorption features were revealed. The electrical transport measurements indicated that the films are insulating at 300 K, with resistivity values ranging between 10 3 and 10 4 Ωcm.

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“…The A 2 CuCl 4 (A=Rb,C n H 2n+1 NH 3 ; n=1-3) [1][2][3][4][5][6][7][8][9] and AMnF 4 (A: Rb, Na, Tl, Cs) [10][11][12][13][14][15][16]) layered compounds present a large variety of interesting physical phenomena associated with antiferrodistortive (AFD) structure displayed by the Jahn-Teller (JT) axially elongated CuCl 6 4-and MnF 6 3-complexes, respectively. They have attracted interest as two-dimensional ferromagnets with T C 10 K 1,3,7,8,10,11) , as related material to high T C superconductors and colossal magnetoresistors 17) , as an organic/inorganic hybrid layered system, and as piezochromic materials 5,13) .…”

Section: Introductionmentioning

confidence: 99%

“…They have attracted interest as two-dimensional ferromagnets with T C 10 K 1,3,7,8,10,11) , as related material to high T C superconductors and colossal magnetoresistors 17) , as an organic/inorganic hybrid layered system, and as piezochromic materials 5,13) . In the last years an intense activity aimed to investigate the behavior of these materials under hydrostatic pressure, in particular, for exploring pressure-induced structural transitions associated with the disappearance of the AFD structure and tilting phenomena [3][4][5][6][7][8]14 . The former effect is noteworthy since it must lead to a switch in the 2D magnetic behavior from ferromagnetic to antiferromagnetic.…”

Section: Introductionmentioning

confidence: 99%

Structural Correlation in Jahn–Teller Systems of Cu²⁺and Mn³⁺under Pressure

et al. 2007

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This work investigates the variation of local structure around Cu 2+ and Mn 3+ as a function of pressure in A 2 CuCl 4 and AMnF 4 layered perovskites by means of x-ray absorption, optical spectroscopy and x-ray diffraction. In both families pressure induces simultaneously reduction of the Jahn-Teller distortion (JTD) and tilting of the CuCl 6 4-and MnF 6 3-octahedra. The JTD release is attained by decreasing both the equatorial and axial Cu-Cl and Mn-F bond distances with pressure, R ax being almost an order magnitude bigger than R eq . We show that the JTD is stable in a wide pressure range. Estimates based on structural data and JT energy indicate that JT suppression would occur above 20 GPa.

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Electron-phonon coupling in charge-transfer and crystal-field states of Jahn-TellerCuCl64−systems

Cited by 75 publications

References 35 publications

On the pressure-induced spin transition in CoCl_2.interplay between Jahn-Teller effect and spin sate in Co²⁺

On the pressure-induced spin transition in CoCl_2.interplay between Jahn-Teller effect and spin sate in Co²⁺

Growth and characterization of hybrid (C_nH_2n+1NH₃)₂CuCl₄ self‐assembled films

Structural Correlation in Jahn–Teller Systems of Cu²⁺and Mn³⁺under Pressure

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Electron-phonon coupling in charge-transfer and crystal-field states of Jahn-TellerCuCl64−systems

Cited by 75 publications

References 35 publications

On the pressure-induced spin transition in CoCl2.interplay between Jahn-Teller effect and spin sate in Co2+

On the pressure-induced spin transition in CoCl2.interplay between Jahn-Teller effect and spin sate in Co2+

Growth and characterization of hybrid (CnH2n+1NH3)2CuCl4 self‐assembled films

Structural Correlation in Jahn–Teller Systems of Cu2+and Mn3+under Pressure

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Product

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On the pressure-induced spin transition in CoCl_2.interplay between Jahn-Teller effect and spin sate in Co²⁺

On the pressure-induced spin transition in CoCl_2.interplay between Jahn-Teller effect and spin sate in Co²⁺

Growth and characterization of hybrid (C_nH_2n+1NH₃)₂CuCl₄ self‐assembled films

Structural Correlation in Jahn–Teller Systems of Cu²⁺and Mn³⁺under Pressure