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Experimental signatures of a three-dimensional quantum spin liquid in effective spin-1/2 Ce2Zr2O7 pyrochlore

by Sala, Gabriele , Manivannan Nallaiyan , Xu, Xianghan , Nevidomskyy, Andriy H , Cao, Huibo , Maple, M Brian , Tam, David W , Gao, Bin , Hu, Haoyu , Jae-Ho, Chung , Ye, Feng , Morosan, Emilia , Spagna, Stefano , Cheong, Sang-Wook , Chen, Gang , Stone, Matthew B , Chien-Lung, Huang , Sasmal, Kalyan , Adroja, Devashibhai T , Verezhak, Joel A T , Dai, Pengcheng , Chen, Tong , Baines, Christopher

in Cerium / Condensed matter physics / Crystals / Electron spin / Excitation / Kagome lattice / Low temperature / Muon spin relaxation / Neutron diffraction / Neutron scattering / Neutrons / Organic chemistry / Single crystals / Spin liquid

2019

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Experimental signatures of a three-dimensional quantum spin liquid in effective spin-1/2 Ce2Zr2O7 pyrochlore

2019

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Experimental signatures of a three-dimensional quantum spin liquid in effective spin-1/2 Ce2Zr2O7 pyrochlore

2019

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Journal Article

Experimental signatures of a three-dimensional quantum spin liquid in effective spin-1/2 Ce2Zr2O7 pyrochlore

Sala, Gabriele,

Manivannan Nallaiyan,

Xu, Xianghan,

Nevidomskyy, Andriy H,

Cao, Huibo,

Maple, M Brian,

Tam, David W,

Gao, Bin,

Hu, Haoyu,

Jae-Ho, Chung,

Ye, Feng,

Morosan, Emilia,

Spagna, Stefano,

Cheong, Sang-Wook,

Chen, Gang,

Stone, Matthew B,

Chien-Lung, Huang,

Sasmal, Kalyan,

Adroja, Devashibhai T,

Verezhak, Joel A T,

Dai, Pengcheng,

Chen, Tong,

Baines, Christopher

2019

Overview

A quantum spin liquid is a state of matter where unpaired electrons’ spins, although entangled, do not show magnetic order even at the zero temperature. The realization of a quantum spin liquid is a long-sought goal in condensed-matter physics. Although neutron scattering experiments on the two-dimensional spin-1/2 kagome lattice ZnCu3(OD)6Cl2 and triangular lattice YbMgGaO4 have found evidence for the hallmark of a quantum spin liquid at very low temperature (a continuum of magnetic excitations), the presence of magnetic and non-magnetic site chemical disorder complicates the interpretation of the data. Recently, the three-dimensional Ce3+ pyrochlore lattice Ce2Sn2O7 has been suggested as a clean, effective spin-1/2 quantum spin liquid candidate, but evidence of a spin excitation continuum is still missing. Here, we use thermodynamic, muon spin relaxation and neutron scattering experiments on single crystals of Ce2Zr2O7, a compound isostructural to Ce2Sn2O7, to demonstrate the absence of magnetic ordering and the presence of a spin excitation continuum at 35 mK. With no evidence of oxygen deficiency and magnetic/non-magnetic ion disorder seen by neutron diffraction and diffuse scattering measurements, Ce2Zr2O7 may be a three-dimensional pyrochlore lattice quantum spin liquid material with minimum magnetic and non-magnetic chemical disorder.

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Publisher

Nature Publishing Group

Subject

Cerium

/ Condensed matter physics