HALL-EFFECT STUDY OF YNI2B2C SUPERCONDUCTOR

Hall-effect and critical magnetic fields H-c2(T) have been studied for YNi2B2C (prepared using high pressure technique) at H less than or eq ual to 130 kOe and 1.6 less than or equal to T less than or equal to 3 00K. The normal state Hall coefficient R(H) was found to be negative ( R(H)=1.43 . 10(-11) Omega cm/Oe at T=4.2 K and H=130 kOe) and slightly growing in absolute value with increase of temperature. The dependenc e of the Hall voltage on magnetic field in the mixed superconducting s tate shows no sign reversal as was observed earlier for some high-T-c systems. The values of \partial derivative H-c2/partial derivative T\ and H-c2(0) are found to be 4.8 kOe/K and 47 kOe respectively.