In-situ temperature calibration below 1 K using the (mu)(sup +) Knight shift in CMN

摘要

The authors present (mu)(sup +) paramagnetic shift measurements between 12 K and about 65 mK in cerium magnesium nitrate (CMN) to investigate its utility as an in-situ temperature calibration source for low temperature (mu)SR experiments. CMN is a salt which exhibits Curie-law susceptibility to temperatures as low as 5 mK. The (mu)(sup +) Knight shift is measured to be (1.46 (+-) 0.03) (times) 10(sup (minus)3)/T + (0.004 (+-) 0.02) (times) 10(sup (minus)3), corresponding to a transferred hyperfine field of (minus)28.5 kOe/(mu)(sub B).