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We present single crystal diffuse neutron scattering study on the quantum spin ice candidate Nd2Zr2O7 pyrochlore in magnetic fields along the (1 1 0) direction. Two-dimensional scattering sheets perpendicular to the (1 -1 0) direction were observed evidencing field-induced one-dimensional correlations and disorder. The pyrochlore lattice is completely separated into orthogonal sets of chains which is in strong contrast to classical spin ice and surprising for an “all-in-all-out” (AIAO) ordered magnet with a non-Ising Hamiltonian. Our mean field and Monte Carlo simulations reveal that the (1 1 0) field induces a transition from the AIAO order to a “2-in-2-out” disordered state with interactions between the two sets of chains cancelled out, resulting in disorder and quantum spin-1/2 XY Z chains.

physical review. b./physical review. b

Field-induced quantum spin- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math> chains and disorder in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Nd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Zr</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>

Field-induced quantum spin- 12 chains and disorder in Nd2Zr2O7