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Field-induced long-range magnetic order in the spin-singlet ground-state system YbAl<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>C<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>: Neutron diffraction study
The $4f$-electron system YbAl${}_{3}$C${}_{3}$ with a nonmagnetic spin-dimer ground state has been studied by neutron diffraction in an applied magnetic field. A long-range magnetic order involving both ferromagnetic and antiferromagnetic components has been revealed above the critical field ${H}_{C}\ensuremath{\sim}6$ T at temperature $T=0.05$ K. The magnetic structure indicates that the …