Zobrazeno 1 - 10
of 52
pro vyhledávání: '"E Liviotti"'
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
https://doi.org/10.1016/j.physb.2005.11.028
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
https://doi.org/10.1016/j.poly.2005.03.080
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
https://doi.org/10.1140/epjb/e2003-00331-0
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
https://doi.org/10.1063/1.1492796
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
https://doi.org/10.1006/spmi.1997.0550
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
https://doi.org/10.1088/0022-3727/30/3/005
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
https://doi.org/10.1016/s0921-4526(96)00633-3
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
https://doi.org/10.1007/s002570050099
Autor:
Giuseppe Amoretti, Nicola Magnani, Stefano Carretta, Tatiana Guidi, Roberto Caciuffo, E. Liviotti, Paolo Santini
Publikováno v:
Journal of Applied Physics. 95:7348-7350
Macroscopic quantum phenomena arising from S-mixing in molecular nanomagnets are studied. While in the lack of an external magnetic field such effects are usually negligible, when a field of suitable intensity and direction is applied total-spin fluc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a9ed9e2136a23a7d27943e5aefa68b2
https://doi.org/10.1063/1.1689763
https://doi.org/10.1063/1.1689763
Publikováno v:
Journal of Magnetism and Magnetic Materials. :365-367
A generalization of the linear theory for J-mixing compounds has recently been reported; this allows to describe the system as an effective isolated multiplet, keeping J-mixing effects into account as second-order perturbative corrections. Within thi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0cbcd41e496c467d00d1bec990f4f9ae
https://doi.org/10.1016/j.jmmm.2003.12.519
https://doi.org/10.1016/j.jmmm.2003.12.519