Dimensional evolution of spin correlations in the magnetic pyrochlore Yb<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Ti<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>7</mml:mn></mml:msub></mml:math>

Ross, Kate; Yaraskavitch, L. R.; Laver, Mark; Gardner, J. S.; Quilliam, J. A.; Sun, Meng; Kycia, J. B.; Singh, Deepak; Proffen, Thomas; Dąbkowska, H. A.; Gaulin, B. D.

doi:10.1103/physrevb.84.174442

Cited by 80 publications

(127 citation statements)

References 33 publications

(49 reference statements)

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“…Strong quantum fluctuations essentially affect statics and dynamics of quantum spin ices. Recent studies show that Yb-based titanate, Yb 2 Ti 2 O 7 , can serve as a good example of a quantum spin ice [233,234,235,236,237,238,239,240,241,242,243,244,245]. Crystalline electric field also well separates the lowenergy doublet from other multiplets there.…”

Section: Quantum Spin Icementioning

confidence: 99%

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

Zvyagin

2013

Low Temperature Physics

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During recent years the interest to frustrated magnets has grown considerably. Such systems reveal very peculiar properties which distinguish them from standard paramagnets, magnetically ordered regular systems (like ferro-, ferri-, and antiferromagnets), or spin glasses. In particular great amount of attention has been devoted to the socalled spin ices, in which magnetic frustration together with the large value of the single-ion magnetic anisotropy of a special kind, yield peculiar behavior. One of the most exciting features of spin ices is related to low-energy emergent excitations, which, from many viewpoints can be considered as analogies of Dirac's monopoles. In this article we review the main achievements of theory and experiment in this field of physics.

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Section: Quantum Spin Icementioning

confidence: 99%

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

Zvyagin

2013

Low Temperature Physics

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“…The magnetism of Yb 2 Ti 2 O 7 has also proved very interesting, with neutron scattering finding no evidence of order at temperatures above 210mK, and evidence for frustrated, anisotropic exchange interactions favouring significant dynamics within an "ice-like" manifold of states [26][27][28][29][30] . Comparable studies of Pr 2 Sn 2 O 7 suggest that it does not order down to 500mK, but with spins continuing to fluctuate [31][32][33] .…”

Section: Introductionmentioning

confidence: 99%

Seeing the light: Experimental signatures of emergent electromagnetism in a quantum spin ice

2012

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The "spin ice" state found in the rare earth pyrochlore magnets Ho2Ti2O7 and Dy2Ti2O7 offers a beautiful realisation of classical magnetostatics, complete with magnetic monopole excitations. It has been suggested that in "quantum spin ice" materials, quantum-mechanical tunnelling between different ice configurations could convert the magnetostatics of spin ice into a quantum spin liquid which realises a fully dynamical, latticeanalogue of quantum electromagnetism. Here we explore how such a state might manifest itself in experiment, within the minimal microscopic model of a such a quantum spin ice. We develop a lattice field theory for this model, and use this to make explicit predictions for the dynamical structure factor which would be observed in neutron scattering experiments on a quantum spin ice. We find that "pinch points", which are the signal feature of a classical spin ice, fade away as a quantum ice is cooled to its zero-temperature ground state. We also make explicit predictions for the ghostly, linearly dispersing magnetic excitations which are the "photons" of this emergent electromagnetism. The predictions of this field theory are shown to be in quantitative agreement with Quantum Monte Carlo simulations at zero temperature.

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“…non-dipolar, order has been invoked [24,25]. Alternatively the coherent magnetic order could be so disrupted by crystal defects that any magnetic Bragg reflections would be too broad to be observable [26]. Due to the long-standing controversy as to the presence of magnetic Bragg reflections [22,27,28,29,30,31,32], the magnetic nature of the ground state of Yb 2 Ti 2 O 7 at low temperature is still uncertain.…”

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confidence: 99%

A novel type of splayed ferromagnetic order observed in Yb₂Ti₂O₇

Yaouanc

Réotier

Keller

et al. 2016

J. Phys.: Condens. Matter

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Abstract. The pyrochlore insulator Yb 2 Ti 2 O 7 has attracted the attention of experimentalists and theoreticians alike for about 15 years. Conflicting neutron diffraction data on the possible existence of magnetic Bragg reflections at low temperature have been published. Here we report the observation of magnetic Bragg reflections by neutron powder diffraction at 60 mK. The magnetic diffraction pattern is analyzed using representation theory. We find Yb 2 Ti 2 O 7 to be a splayed ferromagnet as reported for Yb 2 Sn 2 O 7 , a sibling compound with also dominating ferromagnetic interactions as inferred from the positive Curie-Weiss temperature. However, the configuration of the magnetic moment components perpendicular to the easy axis is of the all-in-all-out type in Yb 2 Ti 2 O 7 while it is two-in-two-out in Yb 2 Sn 2 O 7 . An overall experimental picture of the magnetic properties emerges. Introduction -The broad interest in geometrically frustrated magnetic materials such as pyrochlore insulator compounds R 2 M 2 O 7 (F d3m space group), where R is a rare earth ion and M a non magnetic element, arises from the large diversity of magnetic ground states and exotic fluctuations and excitations encountered [1,2,3,4,5]. This is due to the combined effects of the geometrical constraint resulting from the topology of the pyrochlore lattice and the action of the different possible interactions. As a consequence, classical and quantum fluctuations are particularly strong. Among the interactions of interest, the crystal field at the R position, the Heisenberg nearest-neighbour exchange interaction as well as its extension beyond the nearest-neighbour R ions [6,7], the anisotropy of the exchange interactions [8,9] and the inevitable dipolar interactions have been considered.The most remarkable discovery in the realm of geometrically frustrated magnetic materials has been the spin-ice ground state of Ho 2 Ti 2 O 7 in 1997 [10]. It is characterized by dipolar correlations emerging from the topological spin-ice constraint. This translates into pinch-points in the neutron diffuse scattering patterns [11] and magnetic monopole excitations [12,13,14].Because of its large ground-state degeneracy, a spin-ice compound does not order magnetically, i.e., it is in a so-called spin liquid state where the spins are strongly correlated although they do not display long range order. Quantum fluctuations are not expected to play a significant role for Ho 2 Ti 2 O 7 . However, for some pyrochlore materials strong quantum transverse fluctuations [8,9] could stabilize new magnetic states such as a quantum spin liquid for which new exotic excitations are expected [3,15,16,17,5].One of the favourite candidates for this exotic ground state is Yb 2 Ti 2 O 7 . Indeed, the exchange interactions are highly anisotropic, with a strong ferromagnetic component akin to the Ising exchange of spin ice [18].The dominating ferromagnetic component is also suggested by the positive Curie-Weiss temperature [19]. Remarkably, the Ising character of the exchan...

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Dimensional evolution of spin correlations in the magnetic pyrochlore Yb2Ti2O7

Cited by 80 publications

References 33 publications

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

Seeing the light: Experimental signatures of emergent electromagnetism in a quantum spin ice

A novel type of splayed ferromagnetic order observed in Yb₂Ti₂O₇

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Dimensional evolution of spin correlations in the magnetic pyrochlore Yb2Ti2O7

Cited by 80 publications

References 33 publications

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

New physics in frustrated magnets: Spin ices, monopoles, etc. (Review Article)

Seeing the light: Experimental signatures of emergent electromagnetism in a quantum spin ice

A novel type of splayed ferromagnetic order observed in Yb2Ti2O7

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A novel type of splayed ferromagnetic order observed in Yb₂Ti₂O₇