The effect of magnetic field on the structural phase transitions at low temperature in La2-xSrxCuO4 has been investigated using the ultrasonic sound velocity experiment. An increase in the sound velocity Vs is observed below ~10K around x =0.12, which seems to be a precursor of thestructural phase transition. This increase of Vs is drastically enhanced by applying a magnetic field. In case of x =0.120, the temperature where Vs shows the upturn shifts from 5K(H:0T) to 12K(H:15T), whereas,in x =0.160, Vs is not affected by magnetic fields up to 15T. These results suggest that the structure at low temperatur e (P42/ncm or Pccn) in La2-xSrxCuO4 around x =0.12 is stabilized in magnetic fields.
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