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We report on the search for a CPT and Lorentz invariance violating couplingof the 3He and 129Xe nuclear spins (each largely determined by a valenceneutron) to background tensor fields which permeate the universe. Ourexperimental approach is to measure the free precession of nuclear spinpolarized 3He and 129Xe atoms in a homogeneous magnetic guiding field of about400 nT using LTC SQUIDs as low-noise magnetic flux detectors. As the laboratoryreference frame rotates with respect to distant stars, we look for a siderealmodulation of the Larmor frequencies of the co-located spin samples. As aresult we obtain an upper limit on the equatorial component of the backgroundfield interacting with the spin of the bound neutron bn< 6.7*10^-34 GeV (68%C.L.). Our result improves our previous limit (data measured in 2009) by afactor of 30 and the world's best limit by a factor of 5.

New limit on Lorentz and CPT violating neutron spin interactions using a free precession 3He-129Xe co-magnetometer