Autor: Meisel, M. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Frustrated zig-zag spin chains formed by hydrogen bonds in [Cu(H₂O)(OH)(tmen)]₂[Pd(CN)₄]·2H₂O
Autorzy:: Čižmár, E.
Orendáčová, A.
Orendáč, M.
Kuchár, J.
Feher, A.
Park, J.
Meisel, M.
Powiązania:: https://bibliotekanauki.pl/articles/1054768.pdf
Data publikacji:: 2017-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Et
76.30.-v
75.40.-s
Opis:: The magnetic properties of the novel dimeric compound [Cu(H₂O)(OH)(tmen)]₂[Pd(CN)₄]·2H₂O (tmen=N,N,N',N'-tetramethylethylenediamine) with modulated crystal structure were studied in the temperature range from 95 mK to 300 K. Magnetic measurements revealed a presence of weak antiferromagnetic exchange coupling in the compound. The temperature dependence of specific heat is characterized by the presence of a Schottky-like maximum at 0.47 K and a λ-anomaly at 0.28 K, indicating the formation of long-range order in the system. The comparison of the experimental data with theoretical predictions revealed the presence of antiferromagnetic intradimer exchange coupling J/k_{B}= -1.2 K and interdimer coupling of a similar strength mediated via hydrogen bonds between dimeric units forming a frustrated magnetic zig-zag chain structure.
Źródło:: Acta Physica Polonica A; 2017, 131, 4; 940-942
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: $CuBr_2(C_{10}H_8N_2) - S = 1//2$ Two-Dimensional Rectangular Heisenberg Antiferromagnet
Autorzy:: Čižmár, E.
Kajňaková, M.
Orendáčová, A.
Orendáč, M.
Feher, A.
Anders, A.
Park, J.
Meisel, M.
Powiązania:: https://bibliotekanauki.pl/articles/1534990.pdf
Data publikacji:: 2010-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Et
75.50.Ee
76.30.-v
Opis:: Magnetic susceptibility and X-band electron spin resonance study of a two-dimensional Heisenberg antiferromagnetic system $CuBr_2$(bipy), where bipy = $C_{10}H_8N_2$ is 4,4'-bipyridyl, has been performed in the temperature range from 300 K down to 2 K. A rhombic anisotropy of the g-factor was obtained from X-band EPR measurements with $g_{x}$ = 2.037, $g_{y}$ = 2.100 and $g_{z}$ = 2.219. The temperature dependence of the magnetic susceptibility with a round maximum observed at 28 K suggests antiferromagnetic type of short-range order. No signature of the magnetic long-range order in studied compound was observed. The comparison of the magnetic susceptibility data with a two-dimensional rectangular Heisenberg model yields the values of intralayer exchange couplings J/$k_{B}$ = - 47 K and J'/$k_{B}$ = - 9.4 K.
Źródło:: Acta Physica Polonica A; 2010, 118, 5; 973-974
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Experimental Study of the Thermal Transport in $CsNiF_3 - An S = 1$ Quantum Chain
Autorzy:: Tkáč, V.
Orendáčová, A.
Orendáč, M.
Legut, D.
Tibenská, K.
Feher, A.
Poirier, M.
Meisel, M.
Powiązania:: https://bibliotekanauki.pl/articles/1427127.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.30.Et
75.40.Cx
66.70.Lm
75.30.Ds
Opis:: The heat transport in a single-crystal of $CsNiF_3$ has been performed in the temperature range from 2 K to 7 K in a zero magnetic field, B = 0, as well as in sufficiently large magnetic fields, B = 6 T and 9 T, inducing the ferromagnetic ground state along the hard c-axis. $CsNiF_3$ represents an S = 1 quasi-one-dimensional XY ferromagnet with the intra-chain exchange coupling $J//k_{B}$ ≈ 24 K, single-ion anisotropy $D/k_{B}$ ≈ 8 K, and ordering temperature $T_{N}$ = 2.7 K. Comparison of the phonon and magnon velocities suggests that phonons are the main heat carriers in this magnetic insulator. The thermal conductivity in B = 0 was analysed in the frame of a standard Debye model. The temperature dependence of the effective phonon mean free path was calculated from the experimental data, and the enhancement of the phonon mean free path in B ≠ 0 was obtained, indicating that magnons act as scattering centers for phonons.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1098-1101
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Magnetic Field Induced Slow Magnetic Relaxation in KEr(MoO₄)₂
Autorzy:: Tkáč, V.
Orendáčová, A.
Tarasenko, R.
Pajerowski, D.
Čižmár, E.
Orendáč, M.
Anders, A.
Meisel, M.
Feher, A.
Powiązania:: https://bibliotekanauki.pl/articles/1385617.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.70.Ch
75.30.Gw
75.50.Xx
75.78.-n
Opis:: The spin dynamics of a layered magnetic insulator, KEr(MoO₄)₂, have been investigated in a magnetic field applied along the easy axis at temperatures where the magnetism is dominated by the occupation of a ground doublet. More specifically, the DC magnetization and AC susceptibility were studied in magnetic fields up to 5 T and at temperatures ranging from 1.8 to 20 K. The temperature dependence of the AC susceptibility suggests a slowing down of magnetic relaxation with increasing magnetic field. The magnetic field dependence of the AC susceptibility, studied at nominally 2 K, indicates the presence of low-field, intermediate-field, and high-field regimes characterized by the interplay of internal and external magnetic fields that give rise to different relaxation processes.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 353-355
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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