Polarized electronic spectra of the (CH3NH3)2Cd1 − xMnxCl4 (x = 0–1) perovskite layer doped with Cu2+: Study of the Cl− → Cu2+ charge transfer intensity enhancement along the series

Valiente, Rafael; Rodrı́guez, F.

doi:10.1016/0022-3697(96)00293-4

Cited by 41 publications

(59 citation statements)

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“…Firstly, structural studies by x-ray diffraction (XRD) and x-ray absorption (XAS) in (C 3 H 7 NH 3 ) 2 CuCl 4 7) and (C 2 H 5 NH 3 ) 2 CuCl 4 4,9) concluded, in the latter case, that the JTD is suppressed at 4 GPa (R ax R eq ) in agreement with Raman data 4 . However, correlation studies between lattice parameters from XRD and Cu-Cl bond distances from EXAFS in (C 3 H 7 NH 3 ) 2 CuCl 4 7) showed that although the reduction of the Cu-Cl axial distance with pressure, R ax , is longer than R eq , in no way the JTD is suppressed below 10 GPa.…”

Section: Introductionsupporting

confidence: 69%

“…Single crystals of (CH 3 NH 3 ) 2 CuCl 4 and CsMnF 4 examined in pressure experiments, were grown from solution as described elsewhere 2,16) . The OA experiments under pressure were done using the experimental setups for using high-pressure techniques reported elsewhere 15) .…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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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Section: Introductionsupporting

confidence: 69%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2007

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“…[6][7][8][9]. In both crystals, the absorption bands have been assigned to CL -» Cu2+ CT transitions of the formed CuCl4," complex.…”

Section: Introductionmentioning

confidence: 99%

“…Exceptions to this behaviour are found in (enH2)MnCl4:Cu2+ [6,7] and, in general, in layer perovskites (CnH2n+1NH3)2MnCl4:Cu2+ [8] where a compressed D4h coordination geometry was proposed for explaining the intense CT absorption band at 21000cm"'. Nevertheless, recent investigations performed on isomorphous Cd crystals [8,9] [11]. Paraffin oil was used as pressure transmitter and the pressure was calibrated through the shifts of the ruby R-lines.…”

Section: Introductionmentioning

confidence: 99%

Local Structure of Cu²⁺in the (C₂H₅NH₃)₂MCl₄:Cu²⁺(M = Cd, Mn) Layer Perovskites. Influence of Hydrostatic Pressure in the 0–60 kbar Range*

Moral¹,

Rodrı́guez²,

Valiente³

et al. 1996

Zeitschrift für Physikalische Chemie

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Electronic Spectra and Crystal Structure of the Layered Compounds (CnH2n+1NH3)2CuCl4 (n = 2, 3) in the Region of Their Phase Transitions

Kapustianik

Bazhan

Korchak

2002

phys. stat. sol. (b)

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On the basis of absorption spectroscopy data the temperature evolution of Cu 2þ ion environment in the layered compounds (C n H 2nþ1 NH 3 ) 2 CuCl 4 (n ¼ 2, 3) was studied. For the detailed analysis of experimental data the special program package CrysTool 1.0 based on quantum mechanical models using normalized spherical harmonics (NSH) has been created. It has been found that both crystals contain tetragonally distorted octahedral metal-halogen complexes and that the degree of distortion is less pronounced in the low-temperature phases. The phase transitions (PTs) in both compounds were found to be connected with gradual ordering of the organic cations at cooling. For (C 2 H 5 NH 3 ) 2 CuCl 4 the parameters of crystal field, normalized spherical harmonics, and angular overlap model as well as the metal-halogen distances show jump-like anomalies at the points of PTs (T 1 ¼ 364 K and T 2 ¼ 356 K, at heating), whereas a continuous change was observed at T 3 ¼ 330 K.Na osnovanii dannyh absorbcionnoj spektroskopii issledovana temperaturna¾ +volˇci¾ okruweni¾ iona Cu 2þ v sloistyh soedineni¾h (C n H 2nþ1 NH 3 ) 2 CuCl 4 (n ¼ 2, 3). Dl¾ detal#nogo analiza +ksperimental#nyh rezul#tatov sozdan special#nyj programmnyj paket CrysTool 1.0, baziruˇ §ijs¾ na kvantovo-mehaniqeskih model¾h, v pervuǒ qered#, na modeli normirovannyh sferiqeskih garmonik (NSG). Obnaruweno, qto oba kristalla soderwat tetragonal#no deformirovannye okta+driqeskie metal-galogennye kompleksy i stepen# distorsii menee vyrawena v nizkotemperaturnyh fazah. Pokazano, qto fazovye perehody (FP) v obeih soedineni¾h sv¾zany s postepennym upor¾doqeniem organiqeskih kationov pri ohlawdenii. Dl¾ (C 2 H 5 NH 3 ) 2 CuCl 4 parametry kristalliqeskogo pol¾, normirovannyh sferiqeskih garmonik, modeli uglovogo perekryvani¾ tak we, kak i metall-galogennye rassto¾ni¾ preterpevaˇt skaqkoobraznye anomalii v toqkah FP (T 1 ¼ 364 K i T 2 ¼ 356 K, pri nagreve), v to vrem¾ kak nepreryvna¾ anomali¾ obnaruwena pri T 3 ¼ 330 K.

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Polarized electronic spectra of the (CH3NH3)2Cd1 − xMnxCl4 (x = 0–1) perovskite layer doped with Cu2+: Study of the Cl− → Cu2+ charge transfer intensity enhancement along the series

Cited by 41 publications

References 50 publications

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

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

Local Structure of Cu²⁺in the (C₂H₅NH₃)₂MCl₄:Cu²⁺(M = Cd, Mn) Layer Perovskites. Influence of Hydrostatic Pressure in the 0–60 kbar Range*

Electronic Spectra and Crystal Structure of the Layered Compounds (CnH2n+1NH3)2CuCl4 (n = 2, 3) in the Region of Their Phase Transitions

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Polarized electronic spectra of the (CH3NH3)2Cd1 − xMnxCl4 (x = 0–1) perovskite layer doped with Cu2+: Study of the Cl− → Cu2+ charge transfer intensity enhancement along the series

Cited by 41 publications

References 50 publications

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

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

Local Structure of Cu2+in the (C2H5NH3)2MCl4:Cu2+(M = Cd, Mn) Layer Perovskites. Influence of Hydrostatic Pressure in the 0–60 kbar Range*

Electronic Spectra and Crystal Structure of the Layered Compounds (CnH2n+1NH3)2CuCl4 (n = 2, 3) in the Region of Their Phase Transitions

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

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

Local Structure of Cu²⁺in the (C₂H₅NH₃)₂MCl₄:Cu²⁺(M = Cd, Mn) Layer Perovskites. Influence of Hydrostatic Pressure in the 0–60 kbar Range*