Relief of frustration in the Heisenberg pyrochlore antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Gd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Pt</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>

Hallas, Alannah; Sharma, Arzoo; Cai, Yipeng; Munsie, Timothy; Wilson, M. N.; Tachibana, Makoto; Wiebe, C. R.; Luke, G. M.

doi:10.1103/physrevb.94.134417

Cited by 21 publications

(22 citation statements)

References 46 publications

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“…Gd 2 Pt 2 O 7 , for example, has an only 0.7 percent different lattice parameter than Gd 2 Ti 2 O 7 . The ordering transition in Gd 2 Pt 2 O 7 occurs at T N = 1.6 K, which is at least 50% higher than other Gadolinium-based pyrochlores which order at 1 K or lower ( Figure 14) [59]. The reason for this is the enhanced magnetic exchange from the filled t 2g orbital for Pt 4+ , which appears to remove the frustration.…”

Section: The Future Of High-pressure Pyrochlore Research: 4d and 5d Tmentioning

confidence: 85%

High-Pressure Routes to New Pyrochlores and Novel Magnetism

Zhou

Wiebe

2019

Inorganics

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The pyrochlore structure (A2B2O7) has been an object of consistent study by materials scientists largely due to the stability of the cubic lattice with respect to a wide variety of chemical species on the A or B sites. The criterion for stability under ambient conditions is controlled by the ratio of these cations, which is empirically 1.36 < RA/RB < 1.71. However, under applied pressure synthesis conditions, the pyrochlore lattice is stable up to RA/RB ∼ 2.30, opening up possibilities for new compounds. In this review, we will highlight recent work in exploring new rare-earth pyrochlores such as the germanates RE2Ge2O7 and platinates RE2Pt2O7. We highlight recent discoveries made in these pyrochlores such as highly correlated spin ice behavior, spin liquid ground states, and exotic magnetic ordering.

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Section: The Future Of High-pressure Pyrochlore Research: 4d and 5d Tmentioning

confidence: 85%

High-Pressure Routes to New Pyrochlores and Novel Magnetism

Zhou

Wiebe

2019

Inorganics

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“…The first-order nature is also confirmed by the presence of small thermal hysteresis in the M(T) curves of GPO. 40 Another noteworthy feature in Fig. 4(a) is that the drop of C(T) for GGO and GPO at the lowest temperature region is less profound as GSO 11 , implying the presence of different low-energy magnetic excitations.…”

Section: Specific Heatmentioning

confidence: 95%

Long-range magnetic order in the Heisenberg pyrochlore antiferromagnets Gd2Ge2O7 and
Li
¹
,
Cai
²
,
Qi
³

et al. 2016
Phys. Rev. B

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Gd 2 Sn 2 O 7 and Gd 2 Ti 2 O 7 have been regarded as good experimental realizations of the classical Heisenberg pyrochlore antiferromagnet with dipolar interaction. The former was found to adopt the Palmer-Chalker state via a single, first-order transition at T N ≈ 1 K, while the latter enters a distinct, partially ordered state through two successive transitions at T N1 ≈ 1 K and T N2 = 0.75 K, respectively. To shed more light on their distinct magnetic ground states, we have synthesized two more gadolinium-based pyrochlore oxides, Gd 2 Ge 2 O 7 and Gd 2 Pt 2 O 7 , under high-pressure conditions, and performed detailed characterizations via X-ray powder diffraction, dc and ac magnetic susceptibility, and specific heat measurements down to 100 mK. We found that both compounds enter a long-range antiferromagnetically ordered state through a single, first-order transition at T N = 1.4 K for Gd 2 Ge 2 O 7 and T N = 1.56 K for Gd 2 Pt 2 O 7 , respectively, with the specific-heat anomaly similar to that of Gd 2 Sn 2 O 7 rather than Gd 2 Ti 2 O 7 . Interestingly, the lowtemperature magnetic specific heat of both Gd 2 Ge 2 O 7 and Gd 2 Pt 2 O 7 was found to follow nicely the T 3 -dependence as expected for a three-dimensional antiferromagnet with gapless spin-wave excitations. We have rationalized the enhancement of T N in terms of the reduced Gd-Gd distances for the chemically pressurized Gd 2 Ge 2 O 7 and the addition of extra superexchange pathways through the empty Pt-e g orbitals for Gd 2 Pt 2 O 7 , respectively. Our current study has expanded the family of gadolinium-based pyrochlores, and permits us to achieve a better understanding on their distinct magnetic properties in a more comprehensive perspective.

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“…Following the rich phase diagrams discovered for the insulating pyrochlore compounds R 2 M 2 O 7 , where R is a trivalent rare-earth ion and M = Ti, Sn [1,2], there is a strong momentum to look at other compounds crystallizing within the same cubic crystal structure, but with different M tetravalent elements. For example, reports have been presented for M = Zr [3][4][5][6][7][8], M = Hf [9][10][11], M = Pb [12,13], M = Pt [14][15][16], and M = Ge [12,[16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Long-range dynamical magnetic order and spin tunneling in the cooperative paramagnetic states of the pyrochlore analogous spinel antiferromagnets CdYb2X4 ( X=S<

et al. 2017

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Magnetic systems with spins sitting on a lattice of corner sharing regular tetrahedra have been particularly prolific for the discovery of new magnetic states for the last two decades. The pyrochlore compounds have offered the playground for these studies, while little attention has been comparatively devoted to other compounds where the rare earth R occupies the same sub-lattice, e.g. the spinel chalcogenides CdR2X4 (X = S, Se). Here we report measurements performed on powder samples of this series with R = Yb using specific heat, magnetic susceptibility, neutron diffraction and muon-spin-relaxation measurements. The two compounds are found to be magnetically similar. They long-range order into structures described by the Γ5 irreducible representation. The magnitude of the magnetic moment at low temperature is 0.77 (1) and 0.62 (1) µB for X = S and Se, respectively. Persistent spin dynamics is present in the ordered states. The spontaneous field at the muon site is anomalously small, suggesting magnetic moment fragmentation. A double spin-flip tunneling relaxation mechanism is suggested in the cooperative paramagnetic state up to 10 K. The magnetic space groups into which magnetic moments of systems of corner-sharing regular tetrahedra order are provided for a number of insulating compounds characterized by null propagation wavevectors.

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Relief of frustration in the Heisenberg pyrochlore antiferromagnetGd2Pt2O7

Cited by 21 publications

References 46 publications

High-Pressure Routes to New Pyrochlores and Novel Magnetism

High-Pressure Routes to New Pyrochlores and Novel Magnetism

Long-range magnetic order in the Heisenberg pyrochlore antiferromagnets Gd2Ge2O7 and
Li
¹
,
Cai
²
,
Qi
³

et al. 2016
Phys. Rev. B

Long-range dynamical magnetic order and spin tunneling in the cooperative paramagnetic states of the pyrochlore analogous spinel antiferromagnets CdYb2X4 ( X=S<

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Relief of frustration in the Heisenberg pyrochlore antiferromagnetGd2Pt2O7

Cited by 21 publications

References 46 publications

High-Pressure Routes to New Pyrochlores and Novel Magnetism

High-Pressure Routes to New Pyrochlores and Novel Magnetism

Long-range magnetic order in the Heisenberg pyrochlore antiferromagnets Gd2Ge2O7 and Li1, Cai2, Qi3 et al. 2016Phys. Rev. B

Long-range dynamical magnetic order and spin tunneling in the cooperative paramagnetic states of the pyrochlore analogous spinel antiferromagnets CdYb2X4 ( X=S<

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Resources

About

Long-range magnetic order in the Heisenberg pyrochlore antiferromagnets Gd2Ge2O7 and
Li
¹
,
Cai
²
,
Qi
³

et al. 2016
Phys. Rev. B