Cooperative Jahn-Teller Phase Transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">L</mml:mi><mml:mi mathvariant="normal">a</mml:mi><mml:mi mathvariant="normal">M</mml:mi><mml:mi mathvariant="normal">n</mml:mi><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>Studied by X-Ray Absorption Spectroscopy

Sánchez, M. C.; Subı́as, G.; Garcı́a, J.; Blasco, J.

doi:10.1103/physrevlett.90.045503

Cited by 103 publications

(79 citation statements)

References 22 publications

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“…The entropy in this phase takes the highest value in the whole phase diagram, s L 4 (0) = (0.590 ± 0.002)k B , which is comparable with that obtained experimentally for LaMnO 3 by Sanchez et al 33 . In this case the plot of T C as a function of J 2 /J 1 is continuous as shown in …”

Section: It Is Clear Fromsupporting

confidence: 89%

The phase diagram of an anisotropic Potts model

Ahmed¹,

Gehring²

2005

J. Phys. A: Math. Gen.

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A study is made of an anisotropic Potts model in three dimensions where the coupling depends on both the Potts state on each site but also the direction of the bond between them using both analytical and numerical methods. The phase diagram is mapped out for all values of the exchange interactions. Six distinct phases are identified. Monte Carlo simulations have been used to obtain the order parameter and the values for the energy and entropy in the ground state and also the transition temperatures. Excellent agreement is found between the simulated and analytic results.We find one region where there are two phase transitions with the lines meeting in a triple point.The orbital ordering that occurs in LaM nO 3 occurs as one of the ordered phases.

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Section: It Is Clear Fromsupporting

confidence: 89%

The phase diagram of an anisotropic Potts model

Ahmed¹,

Gehring²

2005

J. Phys. A: Math. Gen.

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“…Unfortunately, to date experimental structural information on OO [4,[7][8][9][10] has not much electronic counterpart. The OO provides a remarkable anisotropy of the effective exchange interaction [2], which explains the A-type antiferromagnetic (AF) spin order below T N ∼ 140 K [11,12].…”

Section: Introductionmentioning

confidence: 99%

Melting of the orbital order in LaMnO3probed by NMR

et al. 2013

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The Mn spin correlations were studied near the O -O phase transition at TJT = 750 K, up to 950 K with 17 O and 139 La NMR in a stoichiometric LaMnO3 crystalline sample. The measured local hyperfine fields originate from the electron density transfered from the e g -and t 2g -orbitals to the 2s(O) and 6s(La) orbits, respectively. By probing the oxygen nuclei, we show that the correlations of the Mn spins are ferromagnetic in the ab-plane and robust up to TJT whereas along the c-axis, they are antiferromagnetic and start to melt below TJT , at about 550 K. Above TJT the ferromagnetic Mn-Mn exchange interaction is found isotropic. The room temperature orbital mixing angle, ϕnmr = 109 ± 1.5• , of the e g ground state is close to the reported value which was deduced from structural data on Jahn-Teller distorted MnO6 octahedra. For T > TJT LaMnO3 can be described in terms of non-polarized eg-orbitals since both eg-orbitals are equally occupied.

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“…The first main feature between 1 and 2 Å corresponds to the Mn-O ͑Me-O, in the case of dashed lines͒ bond distance. The second ͑ϳ2.5 Å͒ and third ͑ϳ3.3 Å͒ features correspond to Mn͑Me͒-Y and Mn͑Me͒-Me͑Mn͒ bond distances in Me-YMnO 3 , 11 respectively. The heights of the first main feature in the Cu K-edge FT curves of Cu-YMnO 3 are significantly reduced, which was argued to be due to the JahnTeller ͑JT͒ distortion caused by Cu cations.…”

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confidence: 98%

Effect of Co, Ni, and Cu substitution on the electronic structure of hexagonal YMnO3 studied by x-ray absorption spectroscopy

Chen

Pao

Tsai

et al. 2009

Applied Physics Letters

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X-ray absorption spectroscopy measurements have been performed to elucidate local electronic and atomic structures of orthorhombic 3d-transition metal-doped yttrium manganites ͑YMnO 3 ͒ with chemical formulae YMn 2/3 Me 1/3 O 3 ͑Me= Co, Ni, and Cu͒. The Mn L 3 -and K-edges x-ray absorption near-edge structure ͑XANES͒ demonstrate the direct substitution of Me 2+ for Mn 3+ , so that the positive effective charge of Mn ions are increased. Me-doping is also found to induce substantial broadening of the Mn L 3 -edge feature, which suggests enhancement of the delocalization of Mn 3d e g subbands and conductivity. Local spin density approximation ͑LSDA͒ +U ͑Hubbard U parameter͒ calculations were used to understand their electronic structures.

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Cooperative Jahn-Teller Phase Transition inLaMnO3Studied by X-Ray Absorption Spectroscopy

Cited by 103 publications

References 22 publications

The phase diagram of an anisotropic Potts model

The phase diagram of an anisotropic Potts model

Melting of the orbital order in LaMnO3probed by NMR

Effect of Co, Ni, and Cu substitution on the electronic structure of hexagonal YMnO3 studied by x-ray absorption spectroscopy

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