High-pressure resistance study of NpSb up to 23 GPa
The resistance versus pressure of NpSb single crystals was measured up to 23 GPa and as a function of temperature from 1.3 to 300 K. Up to 2.3 GPa the Néel temperature, T(N), is found to decrease at a rate of about -11.5 K/GPa. Between 2.3 and 2.7 GPa a dramatic change in the resistance versus temperature behaviour below T(N) indicates some electronic or magnetic transformation in NpSb. At higher pressure the NaCl to tetragonal structural phase transition is observed by a decrease in the room temperature resistance and a maximum in the low temperature resistance. The transition pressure is determined to be between 6 and 8 GPa and the transition shows considerable hysteresis on releasing the pressure. This is compared to previous data from high pressure X-ray diffraction experiments which show a higher transition pressure. The high pressure phase seems likely to be nonmagnetic and indirect evidence for delocalisation of the 5f electrons at the phase transition is shown.
Bibliographic Reference: Article: Physical Review B, Vol. 50 (1994) No. 10, pp. 6577-6582
Record Number: 199510066 / Last updated on: 1995-01-10
Original language: en
Available languages: en