Autor: Florek, G. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Universal Sequence of the Ground States and Energy Level Ordering in Frustrated Antiferromagnetic Rings with a Single Bond Defect
Autorzy:: Antkowiak, M.
Florek, W.
Kamieniarz, G.
Powiązania:: https://bibliotekanauki.pl/articles/1032629.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.10.Jm
75.10.Hk
75.50.Xx
03.65.Aa
Opis:: The universal sequence of the ground states for antiferromagnetic frustrated rings with the odd number of the local spins s and a single bond defect α described by the isotropic Heisenberg Hamiltonian is discussed. The Lieb-Mattis energy level ordering in a pentanuclear ring is revealed and the arising magnetisation steps are demonstrated.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 890-892
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Modeling of the Experimental Molecular-Based Ring-Shaped Nanomagnets
Autorzy:: Antkowiak, M.
Kozłowski, P.
Musiał, G.
Florek, W.
Kamieniarz, G.
Esposito, F.
Powiązania:: https://bibliotekanauki.pl/articles/1534905.pdf
Data publikacji:: 2010-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.40.Cx
75.40.Mg
Opis:: Quantum transfer matrix technique and numerically exact diagonalization method are applied to the Heisenberg spin systems to model ring-shaped molecules. Two cases are investigated: (i) a dozen of S = 1 spins with additional biquadratic exchange and (ii) a dimetallic molecule $Cr_7Cd$, where it is assumed that exchange anisotropy is determined in a local coordination system. In the latter case the calculated susceptibility is compared with experimental results.
Źródło:: Acta Physica Polonica A; 2010, 118, 5; 965-966
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Highly Degenerated Ground States in Some Rings Modeled by the Ising Spins with Competing Interactions
Autorzy:: Florek, W.
Antkowiak, M.
Kamieniarz, G.
Jaśniewicz-Pacer, K.
Powiązania:: https://bibliotekanauki.pl/articles/1030746.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.10.Jm
75.50.Ee
75.50.Xx
Opis:: We discuss three Ising ring systems with competing interactions which are analogs of quantum systems and we show that they exhibit similar properties. In particular, the archetypal system of three antiferromagnetically coupled spins s has two magnetically degenerated ground states with |M|=s, when 0
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 411-413
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Magnet with Ferromagnetic Nearest-Neighbor and Antiferromagnetic Next-Nearest-Neighbor Exchange Interactions
Autorzy:: Szymczak, R.
Szymczak, H.
Kamieniarz, G.
Szukowski, G.
Jaśniewicz-Pacer, K.
Florek, W.
Maltsev, V.
Babonas, G.
Powiązania:: https://bibliotekanauki.pl/articles/1808031.pdf
Data publikacji:: 2009-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.40.Cx
75.50.Ee
75.30.Gw
75.30.Et
75.30.Kz
Opis:: Magnetic properties of $Pb[Cu(SO_4)(OH)_2]$ (linarite) natural single crystals were studied by magnetization and specific heat measurements. The angular dependences of magnetization were revealed which correlated with the regularities of the crystal structure. At about 2.8 K this quasi-one-dimensional Heisenberg system undergoes a phase transition to the long-range antiferromagnetic order with antiparallel magnetic moments aligned probably along the b-axis. The antiferromagnetic order is evidenced by the metamagnetic transition and pronounced λ-type anomaly at $T_N$ in the specific heat. Using phenomenological modeling based on a quantum transfer-matrix method, we argue that at higher temperatures linarite is a quasi-one-dimensional system with competing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchange interactions.
Źródło:: Acta Physica Polonica A; 2009, 115, 5; 925-930
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki