Anomaly in the magnetic susceptibility of 3He in the matrix of solid 4He at temperatures below 10 mK

Pulsed NMR technique is employed to measure the magnetic susceptibility of the decomposed 3He−4He solid solution in the temperature range 0.7−80 mK. The pressure in the sample and the concentration of 3He before phase separation were 3.71 MPa and 0.50 ± 0.1% He, respectively. It was found that the magnetic susceptibility of the sample obeys the Curie–Weiss law above 7 mK, while a flat peak exists near 3 mK. Investigation of the magnetic energy thermal relaxation time shows that the violated magnetization is restored in a time-exponential manner to its equilibrium value corresponding to the temperature of the thermal bath. At temperatures below 10 mK, the time constant of this process did not exceed 6 min. The results lead to the assumption that the decomposed solid solution contains a special magnetic state which differs significantly from the antiferromagnetism in bulk solid 3He.

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