  The contribution of parity-violating effects to the phase transition of the
D-/L-alanine crystals was confirmed by 1H CRAMPS solid state NMR, DC-magnetic
susceptibilities and ultrasonic measurements. It was found that the spin
relaxation mechanism of alpha-H nucleus of D-alanine molecule is different from
L-alanine and the effect is stronger than that of L-alanine. In addition,
D-alanine undergoes a magnetic phase transition at a field of 1.0T, which is
confirmed by a peak-form ultrasonic attenuation curve. DC-magnetic
susceptibilities measurements of L-alanine also indicate abnormal magnetic
properties, which is accompanied by a step-form ultrasonic attenuation jump and
its mechanism seems different from that of D-alanine. The phase transition is
considered to act as a cooperating amplification mechanism of the P-odd effects
at the molecular level.
