Magnetoelectric behavior from cluster multipoles in square cupolas: Study of 
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 in comparison with Ba and Pb isost

Kato, Yasuyuki; Kimura, Kazuhiro; Miyake, Atsushi; Tokunaga, Masashi; Matsuo, Akira; Kindo, Koichi; Akaki, Mitsuru; Hagiwara, Masayuki; Kimura, Shojiro; Kimura, T.; Motome, Yukitoshi

doi:10.1103/physrevb.99.024415

Cited by 18 publications

(23 citation statements)

References 19 publications

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“…In the present paper we focus our attention on the magnetization process and magnetocaloric effect of the spin-1/2 X X Z Heisenberg triangular and pentagonal cupola with an odd number of spins N = 9 and N = 15. In addition, we investigate the spin-1/2 X X Z Heisenberg square cupola with the total number of spins N = 12, for which several experimental realizations were found in the magnetic compounds Sr(TiO)Cu 4 (PO 4 ) 4 [42,43], Pb(TiO)Cu 4 (PO 4 ) 4 [44], Ba(TiO)Cu 4 (PO 4 ) 4 [45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect

Karľová¹

2020

Condens. Matter Phys.

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The magnetization curves and magnetocaloric effect during the adiabatic demagnetization of antiferromagnetic spin-1/2 XXZ Heisenberg clusters with the shape of Johnson's solids (triangular cupola, square cupola and pentagonal cupola) are investigated using the exact numerical diagonalization for different values of the exchange anisotropy ranging in between the Ising and fully isotropic limit. It is demonstrated that spin-1/2 XXZ Heisenberg cupolae display, in comparison with their Ising counterparts, at least one more magnetization plateau. The novel magnetization plateaux extends over a wider range of the magnetic fields with increasing of a quantum part of the XXZ exchange coupling at the expense of the original plateaux present in the limiting Ising case. It is shown that the spin-1/2 XXZ Heisenberg triangular and pentagonal cupolae exhibit an enhanced magnetocaloric effect in the vicinity of zero magnetic field, which makes these magnetic systems promising refrigerants for cooling down to ultra-low zero temperatures.

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Section: Introductionmentioning

confidence: 99%

Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect

Karľová¹

2020

Condens. Matter Phys.

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“…In the present paper we will focus our attention on the magnetization process and magnetocaloric effect of the XXZ Heisenberg triangular and pentagonal cupola with an odd number of spins N = 9 and N = 15. In addition, we will investigate the XXZ Heisenberg square cupola with the total number of spins N = 12, for which several experimental realizations in compounds Sr(TiO)Cu 4 (PO 4 ) 4 [32,33], Pb(TiO)Cu 4 (PO 4 ) 4 [34], Ba(TiO)Cu 4 (PO 4 ) 4 [35,36,37,38,39] are known.…”

Section: Introductionmentioning

confidence: 99%

Spin-1/2 $XXZ$ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect

Karľová

2020

Preprint

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The magnetization process and adiabatic demagnetization of antiferromagnetic spin-1/2 XXZ Heisenberg clusters with the shape of Johnson's solids (triangular cupola, square cupola and pentagonal cupola) are examined using the exact numerical diagonalization depending on a relative strength of the exchange anisotropy. It is demonstrated that XXZ Heisenberg cupolae display at least one more magnetization plateau, which is totally absent in Ising cupolae. The novel magnetization plateaux extend over a wider range of magnetic field with increasing of a quantum part of the XXZ exchange interaction at the expense of the original plateaux present in the Ising limiting case. It is shown that XXZ Heisenberg triangular and pentagonal cupola exhibits in the proximity of all magnetization jumps an enhanced magnetocaloric effect in a vicinity to zero magnetic field, making these magnetic systems a promising refrigerant for cooling down to absolute temperature.

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“…Multipoles can also be defined in an extended scale over several atomic sites and such cluster-type extensions have recently garnered great attention as a source of intriguing phenomena [3][4][5][6][7][8][9][10][11]. For instance, a magnetic toroidal dipole induces the second harmonic generation in LiCoPO 4 [12], and the magnetocurrent effect in UNi 4 B [6,13] and Ce 3 TiBi 5 [14], a magnetic octupole plays a crucial role in the anomalous Hall effect [7,15], the anomalous Nernst effect [16], and the magneto-optical Kerr effect [17] in Mn 3 Sn, and a magnetic quadrupole causes the magnetoelectric effect in A(TiO)Cu 4 (PO 4 ) 4 (A=Ba, Sr, and Pb) [18][19][20][21]. Thus, it is useful to identify relevant multipoles for predicting the electronic, magnetic, transport, and optical properties.…”

Section: Introductionmentioning

confidence: 99%

Optical Hall response in spin-orbit coupled metals: Comparative study of magnetic cluster monopole, quadrupole, and toroidal orders

Sato,

Umimoto,

Sugita

et al. 2020

Preprint

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The optical Hall response is theoretically studied for spin-orbit coupled metals with ferroic orders of cluster-type magnetic multipoles. We find that different magnetic multipoles give rise to distinct spectra in the optical Hall conductivity. In the cases of monopole and quadrupole orders, the optical Hall response appears predominantly in high-and low-energy regions, which correspond to the energy scales of electron correlation and kinetic energy, respectively, while the response is dispersed and rather weak in the case of toroidal order. By decomposing the spectra into different interband contributions, we reveal selection rules stemming from the interplay between the antisymmetric spinorbit coupling and the underlying multipoles. Our results suggest that the optical Hall measurement is useful to detect and distinguish the cluster-type magnetic multipole orders.

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Magnetoelectric behavior from cluster multipoles in square cupolas: Study of Sr(TiO)Cu4(PO4)4 in comparison with Ba and Pb isost

Cited by 18 publications

References 19 publications

Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect

Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect

Spin-1/2 $XXZ$ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect

Optical Hall response in spin-orbit coupled metals: Comparative study of magnetic cluster monopole, quadrupole, and toroidal orders

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