Phase diagram T, H investigation by direct measurement of dR-dT in a magnetic materialReport as inadecuate




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Abstract : The temperature dependences of the resistance RT and the singular part of dR-dT near the critical regime and in the presence of magnetic fields H0-5 T are presented in this paper. The measurements were carried out using a novel technique from which dRT-dT|H can be determined directly. This quantity, being related to the transport coefficient 1-R . dR-dT, is directly connected to the specific heat behavior near the phase transition. The high accuracy of our experimental data allows us to compare the critical exponents deduced from our previous measurements in zero field H = 0 T and those predicted by several models of the renormalization group theory. We present a complete phase diagram for a single crystal of erbium oriented along the c-axis. This constitutes the first systematic study of field-induced magnetic phase transitions using the magnetoresistance RT, H and its derivative dR-dT|H near the critical points.





Author: Ph. Gandit F. Terki J. Chaussy P. Lejay

Source: https://hal.archives-ouvertes.fr/



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