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A quantum spin liquid (QSL) is a state of matter where unpaired electrons'spins in a solid are quantum entangled, but do not show magnetic order in thezero-temperature limit. Because such a state may be important to themicroscopic origin of high-transition temperature superconductivity and usefulfor quantum computation, the experimental realization of QSL is a long-soughtgoal in condensed matter physics. Although neutron scattering experiments onthe two-dimensional (2D) spin-1/2 kagome-lattice ZnCu3(OD)6Cl2 and effectivespin-1/2 triangular lattice YbMgGaO4 have found evidence for a continuum ofmagnetic excitations, the hallmark of a QSL carrying 'fractionalized quantumexcitations', at very low temperature, magnetic and nonmagnetic site chemicaldisorder complicates the interpretation of the data. Recently, thethree-dimensional (3D) Ce3+ pyrochlore lattice Ce2Sn2O7 has been suggested as aclean, effective spin-1/2 QSL candidate, but there is no evidence of a spinexcitation continuum. Here we use thermodynamic, muon spin relaxation ({\mu}SR), and neutron scattering experiments on single crystals of Ce2Zr2O7, acompound isostructural to Ce2Sn2O7, to demonstrate the absence of magneticordering and the presence of a spin excitation continuum at 35 mK, consistentwith the expectation of a QSL. Since our neutron diffraction and diffusescattering measurements on Ce2Zr2O7 reveal no evidence of oxygen deficiency andmagnetic/nonmagnetic ion disorder as seen in other pyrochlores, Ce2Zr2O7 may bethe first example of a 3D QSL material with minimum magnetic and nonmagneticchemical disorder.

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