Artículos de revistas
Accurate Temperature Regulation In A Commercial Squid Magnetometer During Fast Cooling
Registro en:
Czechoslovak Journal Of Physics. , v. 46, n. SUPPL. 5, p. 2805 - 2806, 1996.
114626
10.1007/BF02570389
2-s2.0-77958164177
Autor
Spagna S.
Diederichs J.
Pratt D.M.
Sager R.E.
Rettori C.
Institución
Resumen
A detailed investigation of the temperature profile of the measuring region in a commercial SQUID magnetometer was performed over the temperature range from approximately 1.75 to 350 K. Temperature measurements employing three thermometers mounted along the sample tube, revealed the development of a significant thermal gradient during fast cooling from high temperatures. Comparison with measurements of the time dependence of the magnetic nmment of a Pr 2CuO 4 single crystal indicated that long waiting times may be required for sample temperature stabilization depending upon which thermometer is actively used as a control sensor in the temperature regulation. Highly improved temperature control during fast cooling is achieved using a continuous temperature sweeping mode and a combination of two thermometers. 46 SUPPL. 5 2805 2806 Paulius, L.M., Alamasan, C.C., Maple, M.B., (1993) Phys. Rev. B, 47, p. 11627 Kopelevich, Y., Moehlecke, S., (1995) Physica C, 253, p. 325 Friedmann, J., (CCNY) private comunicationMPMS User's Manual (1996) Quantum Design, , Negative coefficent thermometer, see Martins, G.B., Rao, D., Valdiva, J.A., Pires, M.A., Barbieris, G.E., Rettori, C., Venegas, P.A., Fisk, Z., (1995) Phys. Rev. B, 51, p. 11909