Výsledky vyhledávání

Decay of time-correlations of microscopic observables in magnetic molecules

Autor: Stefano Carretta, Giuseppe Amoretti, E. Liviotti, Paolo Santini

Publikováno v: Physica B: Condensed Matter. :109-113

We derive a general expression for the quasielastic part of the dynamic structure factor in the presence of a heat bath, starting from the master equation applied to the full microscopic Hamiltonian. By specializing this expression to the case of the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c306954ac5e0fd543a704bc5041c7235
https://doi.org/10.1016/j.physb.2005.11.028

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Quantum tunneling of the magnetization in molecular nanomagnets: The crucial role of S mixing

Autor: Giuseppe Amoretti, Stefano Carretta, E. Liviotti, Paolo Santini, Nicola Magnani

Publikováno v: Polyhedron. 24:2459-2463

Hysteresis curves of molecular nanomagnets display a step-like behavior typical of the relaxation through quantum tunneling of the magnetization. The relaxation rate depends on the value of the so-called tunnel splitting, i.e., the gap between quasi-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::74098b15e8139d83baf4b804bb75cae1
https://doi.org/10.1016/j.poly.2005.03.080

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Macroscopic evidence of quantum coherent oscillations of the total spin in the Mn-[ $\mathsf{3\times3}$ ] molecular nanomagnet

Autor: R. Caciuffo, P. Santini, N. Magnani, E. Liviotti, Giuseppe Amoretti, Tatiana Guidi, S. Carretta

Publikováno v: The European Physical Journal B - Condensed Matter. 36:169-173

Molecular nanomagnets, besides promising to open new frontiers in technology, have attracted huge interest in the scientific community because they can exhibit the phenomenon known as quantum tunnelling of the magnetization, i.e. coherent fluctuation

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bad4cc40834ab6c6837d136d9bf41521
https://doi.org/10.1140/epjb/e2003-00331-0

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S-mixing contributions to the high-order anisotropy terms in the effective spin Hamiltonian for magnetic clusters

Autor: Stefano Carretta, Giuseppe Amoretti, E. Liviotti

Publikováno v: The Journal of Chemical Physics. 117:3361-3368

The magnetic clusters are usually described by an effective Hamiltonian acting in a fixed S space. This single-spin description neglects the mixing between states with different total spin S produced by anisotropic interactions, such as the local cry

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a820d5815d99fea43385c8b44e144d8c
https://doi.org/10.1063/1.1492796

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Landauer resistance and white noise

Autor: E. Liviotti, P. Erdös

Publikováno v: Superlattices and Microstructures. 23:893-899

An analytical formula of the average Landauer resistance for a Gaussian distribution of one-dimensional potentials for monochromatic waves is given. The distribution is characterized by a correlation lengthlc: the case oflc ≠ 0 and the case oflc =

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::64407452951bbefb7b1453eb393ac756
https://doi.org/10.1006/spmi.1997.0550

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Inelastic neutron scattering study of the molecular grid nanomagnet Mn-[3x3]

Autor: Giuseppe Amoretti, Nicola Magnani, Tatiana Guidi, C. Mondelli, Christopher D. Frost, Laurence K. Thompson, Oliver Waldmann, Paolo Santini, Liang Zhao, S. Carretta, Roberto Caciuffo, E. Liviotti

Publikováno v: Physical review. B, Condensed matter and materials physics 69 (2004). doi:10.1103/PhysRevB.69.104432
info:cnr-pdr/source/autori:T. Guidi; S. Carretta; E. Liviotti; N. Magnani; C. Mondelli; O. Waldmann; L. K. Thompson; L. Zhao; C.D. Frost; G. Amoretti; R. Caciuffo/titolo:Inelastic neutron scattering study of the molecular grid nanomagnet Mn-[3x3]/doi:10.1103%2FPhysRevB.69.104432/rivista:Physical review. B, Condensed matter and materials physics/anno:2004/pagina_da:/pagina_a:/intervallo_pagine:/volume:69

The spin Hamiltonian of a supramolecular planar grid formed by nine Mn(II) ions in an almost square geometry has been determined from the analysis of inelastic neutron scattering spectra. The experimental data have been interpreted in the framework o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::645fc2bf430e31676701831a4824dd3b
http://www.cnr.it/prodotto/i/185890

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Wave transmission through lattices, superlattices and layered media

Autor: R C Herndon, Paul Erdös, E Liviotti

Publikováno v: Journal of Physics D: Applied Physics. 30:338-345

Wave transmission through periodic and periodic layered structures is studied and the `average transmissivity' for an incident beam with a bounded uniform spectrum is defined. Both positive and negative -function and rectangular potentials are analys

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1ecf8db37f8b7b6b10730d0f144ea2bf
https://doi.org/10.1088/0022-3727/30/3/005

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Competition between Kondo effect and magnetic interaction in Kondo systems

Autor: P. Santini, E. Liviotti, Giuseppe Amoretti, Lucio Claudio Andreani, E. Pavarini

Publikováno v: Physica B: Condensed Matter. :523-528

The phenomena of Kondo screening and moment reduction in almost localized Kondo systems are studied on the basis of a molecular-field approach. An interpretation of moment reduction as observed by elastic neutron scattering is given; it is shown how

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a64e7b2e0dcbd141f123a4928f23f084
https://doi.org/10.1016/s0921-4526(96)00633-3

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Molecular-field theory of moment reduction in Kondo systems with crystal-field effects

Autor: Lucio Claudio Andreani, Giuseppe Amoretti, P. Santini, E. Liviotti

Publikováno v: Zeitschrift für Physik B Condensed Matter. 100:95-104

Several dense Kondo compounds have a low-temperature ordered phase in which the magnetic moments are reduced with respect to the values expected for the crystal-field (CEF) ground state. In the present work the phenomenon of moment reduction is studi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4f15dad99c6247847e272cf80ffe3bae
https://doi.org/10.1007/s002570050099

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Magnetic transitions in a Cr8 antiferromagnetic ring

Autor: S. Carretta, J. van Slageren, T. Guidi, E. Liviotti, C. Mondelli, F. Carsughi, R. Sessoli, D. Gatteschi, G. Amoretti, R. Caciuffo

Publikováno v: ILL Annual Report (2002): 30.
info:cnr-pdr/source/autori:S. Carretta, J. van Slageren, T. Guidi, E. Liviotti, C. Mondelli, F. Carsughi, R. Sessoli, D. Gatteschi, G. Amoretti and R. Caciuffo/titolo:Magnetic transitions in a Cr8 antiferromagnetic ring/doi:/rivista:ILL Annual Report/anno:2002/pagina_da:30/pagina_a:/intervallo_pagine:30/volume

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=cnr_________::cb6e9f14925011dd2a8881046fa6c9de
http://www.cnr.it/prodotto/i/263573

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