The magnetic behaviour of Dy2Ir2O7 – Beyond the mean field approximation

Vlášková, K.; Diviš, M.; Klicpera, M.

doi:10.1016/j.jmmm.2021.168220

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…That is, the ground-state singlet in Tm 2 Ti 2 O 7 is followed by doublets and singlets separated in energy in a very similar way as refined for Tm 2 Ir 2 O 7 (Table I). The same excitation scheme, similar excitation energies, as well as good agreement in comparing the CF schemes of other titanates and iridates [20,23,25,26,48] strongly support our refinement of the INS data and the final set of CF parameters.…”

Section: Magnetization and Specific Heat In View Of The Determined Cf...supporting

confidence: 73%

“…The numerical diagonalization of the microscopic Hamiltonian provided eigenfunctions and eigenenergies. Magnetization as a function of temperature and external magnetic field, and the Schottky contribution to specific heat, were calculated using our in-house computer codes (for details, see [26]).…”

Section: -2mentioning

confidence: 99%

“…In addition to the long-range Ir order, the induced A order (of magnetic rare-earth ions), and the A-A magnetic correlations, the low-temperature behavior of A 2 Ir 2 O 7 is defined by the A single-ion properties, namely the crystal field (CF) acting on the A cation. The crystal-field schemes of heavy rare-earth A 2 Ir 2 O 7 compounds have been studied systematically by inelastic neutron scattering-Dy 2 Ir 2 O 7 [8], Ho 2 Ir 2 O 7 [9], Er 2 Ir 2 O 7 [25], and Yb 2 Ir 2 O 7 [23]-and confronted with macroscopic data [20,25,26]. Recently, we synthesized and thoroughly characterized the previously unreported Tm 2 Ir 2 O 7 member of the family [20].…”

Section: Introductionmentioning

confidence: 99%

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Neutron scattering study of the Tm2Ir2O7 pyrochlore iridate

Klicpera

Vlášková²,

Staško³

et al. 2022

Phys. Rev. B

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The newly synthesized Tm 2 Ir 2 O 7 iridate is investigated using neutron scattering techniques. Powder neutron diffraction patterns confirm that Tm 2 Ir 2 O 7 crystallizes in a cubic structure of pyrochlore type, consistent with the rest of the rare-earth A 2 Ir 2 O 7 series, and the crystal structure is preserved down to 0.2 K. The thermal expansion of the crystal lattice is well described by a Debye model of lattice vibrations. A weak magnetic signal consistent with the so-called all-in-all-out magnetic order (AIAO) is traced at low temperature; however, it cannot serve as unambiguous evidence of the AIAO structure in the compound. Nondispersive magnetic excitations in energy-momentum space are observed in inelastic neutron scattering spectra of Tm 2 Ir 2 O 7 . The crystal-field scheme and parameters of the thulium iridate are refined and discussed with respect to the specific heat and magnetization data. The results are supported by mean-field calculations.

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Section: Magnetization and Specific Heat In View Of The Determined Cf...supporting

confidence: 73%

Section: -2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neutron scattering study of the Tm2Ir2O7 pyrochlore iridate

Klicpera

Vlášková²,

Staško³

et al. 2022

Phys. Rev. B

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“…The family of rare-earth RE 2 Ir 2 O 7 (RE = from Nd to Lu) with Ir 5+ (5d 4 ) exhibits metal/semiconductor-to-insulator transitions (MIT) with decreasing temperature [6][7][8]. The insulating state seems to be induced by the magnetic ordering of the Ir sublattice, and the transition temperatures moving to higher values were observed from A = Nd to Lu [8][9][10][11]. The reason is that magnetic ordering is influenced by interatomic distances and the change in the Ir-O-Ir angle, which are in turn connected to the size of rare-earth cations [6,7].…”

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confidence: 99%

Anomalous metallic conductivity and short-range ferromagnetic correlation in high-pressure synthesized pyrochlore

Zhao,

Deng,

Zhang

et al. 2024

EPL

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Iridates show fascinating properties due to the unpredictable ground states of their Ir cations. Generally, Ir5+(5d4) systems exhibit insulating nonmagnetic states owing to the strong spin-orbit coupling (SOC). Herein a new pyrochlore iridates Hg2Ir2O7 with an Ir5+ charge state synthesized by high-pressure technique is reported. Hg2Ir2O7 crystallizes in the typical cubic pyrochlore crystal structure. The Ir5+ valence state is evidenced by the XAS spectrum. Surprisingly, Hg2Ir2O7 displays short-range ferromagnetic correlations at low temperatures as evidenced by S-shape field-dependent magnetization curves, positive magnetoresistance, and magnetic excitations in specific heat. Furthermore, it also shows metallic conduction and large electron component of specific heat. These results all indicate that Ir5+ in Hg2Ir2O7 deviates from SOC-dominated insulating nonmagnetic states.

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