Low-temperature magnetisation process in the cubic pyrochlore quantum antiferromagnet, Er2Ti2O7

Petrenko, Oleg A.; Lees, Martin R.

doi:10.1140/epjb/e2013-40404-9

Cited by 10 publications

(8 citation statements)

References 23 publications

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“…3(a)). Experimentally, a similar hysteretic behavior was reported in non-coplanar antiferromagnets which have the pyrochlore and fcc lattices [59][60][61][62][63] .…”

supporting

confidence: 73%

Frustrated magnetism in the Heisenberg pyrochlore antiferromagnets $A$Yb$_2$$X$$_4$ ($A$ = Cd, Mg, $X$ = S, Se)

Higo,

Iritani,

Halim

et al. 2016

Preprint

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Our polycrystalline sample study on the Yb-based chalcogenide spinels AYb2X4 (A = Cd, Mg, X = S, Se) has revealed frustrated magnetism due to the antiferromagnetically coupled Heisenberg spin on the pyrochlore lattice. Our crystal electric field analysis indicates the Yb ground state has nearly Heisenberg spins with a strong quantum character of the ground doublet. All the materials exhibit an antiferromagnetic order at 1.4-1.8 K, much lower temperature than the antiferromagnetic exchange coupling scale of ∼ 10 K. The magnetic specific heat CM shows a T 3 dependence, indicating the gapless feature in the Yb-based chalcogenide spinels. The magnetic entropy change much smaller than R ln 2 below the Néel temperature and the small local magnetic field estimated from the µSR measurements strongly suggest the significantly reduced size of the ordered moment in comparison with the bare moment size 1.33 µB/Yb supporting strong fluctuations in the commensurate and incommensurate ordered states in CdYb2S4 and MgYb2S4, respectively.

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“…3(a)). Experimentally, a similar hysteretic behavior was reported in non-coplanar antiferromagnets which have the pyrochlore and fcc lattices [59][60][61][62][63] .…”

supporting

confidence: 73%

Frustrated magnetism in the Heisenberg pyrochlore antiferromagnets $A$Yb$_2$$X$$_4$ ($A$ = Cd, Mg, $X$ = S, Se)

Higo,

Iritani,

Halim

et al. 2016

Preprint

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“…It is also observed in the magnetization curves, although less sharply, as shown in Figure 8 and in Ref. 39. Nevertheless, the physical origin is different since, in this direction, no phase transition occurs at low field.…”

Section: H [110]supporting

confidence: 51%

“…To determine the changes in the magnetic structures corresponding to the anomalies reported at low field in the isothermal magnetization curves 39 , and to test the above theoretical ideas, neutron diffraction measurements have been performed in the three directions of the applied field.…”

Section: B Experimental Resultsmentioning

confidence: 99%

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Field-induced phase diagram of the XY pyrochlore antiferromagnetEr2Ti2O7

et al. 2017

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We explore the field-temperature phase diagram of the XY pyrochlore antiferromagnet Er2Ti2O7 by means of magnetization and neutron diffraction experiments. Depending on the field strength and direction relative to the high symmetry cubic directions [001], [110] and [111], the refined field induced magnetic structures are derived from the zero field ψ2 and ψ3 states of the Γ5 irreducible representation which describes the ground state of XY pyrochlore antiferromagnets. At low field, domain selection effects are systematically at play. In addition, for [001], a phase transition is reported towards a ψ3 structure at a characteristic field H 001 c = 43 mT. For [110] and [111], the spins are continuously tilted by the field from the ψ2 state, and no phase transition is found while domain selection gives rise to sharp anomalies in the field dependence of the Bragg peaks intensity. For [110], these results are confirmed by high resolution inelastic neutron scattering experiments, which in addition allow us to determine the field dependence of the spin gap. This study agrees qualitatively with the scenario proposed theoretically by Maryasin et al. [Phys. Rev. B 93, 100406(R) (2016)], yet the strength of the field induced anisotropies is significantly different from theory. arXiv:1701.07220v2 [cond-mat.str-el]

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“…This is in contrast to the known pyrochlore system with XY anisotropy, Er 2 Ti 2 O 7 . In this case a feature is seen in the fielddependent magnetization at about 1 T which shows the expected difference in the absolute value for the three main directions of the cubic system [21][22][23]. The absence of such a difference in NaCaCo 2 F 7 might be caused by an accidental "masking" of XY anisotropy.…”

Section: B Magnetizationmentioning

confidence: 75%

Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride NaCaCo2F7

et al. 2019

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We report high-frequency/high-field electron spin resonance (ESR) and high-field magnetization studies on single crystals of the bond-disordered pyrochlore NaCaCo2F7. Frequency-and temperature-dependent ESR investigations above the freezing temperature T f ∼ 2.4 K reveal the coexistence of two distinct magnetic phases. A cooperative paramagnetic phase, evidenced by a gapless excitation mode, is found as well as a spin-glass phase developing below 20 K which is associated with a gapped low-energy excitation. Effective g-factors close to 2 are obtained for both modes in line with pulsed high-field magnetization measurements which show an unsaturated isotropic behavior up to 58 T at 2 K. In order to describe the field-dependent magnetization in high magnetic fields, we propose an empirical model accounting for highly anisotropic ionic g-tensors expected for this material and taking into account the strongly competing interactions between the spins which lead to a frustrated ground state. As a detailed quantitative relation between effective g-factors as determined from ESR and the local g-tensors obtained by neutron scattering [Ross et al., Phys. Rev. B 93, 014433 (2016)] is still sought after, our work motivates further theoretical investigations of the low-energy excitations in bond-disordered pyrochlores. I. III. RESULTSA. Electron spin resonance

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Low-temperature magnetisation process in the cubic pyrochlore quantum antiferromagnet, Er2Ti2O7

Cited by 10 publications

References 23 publications

Frustrated magnetism in the Heisenberg pyrochlore antiferromagnets $A$Yb$_2$$X$$_4$ ($A$ = Cd, Mg, $X$ = S, Se)

Frustrated magnetism in the Heisenberg pyrochlore antiferromagnets $A$Yb$_2$$X$$_4$ ($A$ = Cd, Mg, $X$ = S, Se)

Field-induced phase diagram of the XY pyrochlore antiferromagnetEr2Ti2O7

Magnetic interactions and spin dynamics in the bond-disordered pyrochlore fluoride NaCaCo2F7

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