Pressure dependence magnetic structure

One of the best resolved Au magnetic spectra is that of Au2Mn at 4-2 K, which is illustrated in Fig. 16.28 [98]. The eight allowed lines for a I transition with E2 admixture are clearly shown, and the asymmetry in the spectrum is due to the presence of a quadrupole interaction (e qQ = 2-705(70) mm s ), which is directed perpendicular to the magnetic axis Httt = 1571 kG). An unusually large pressure dependence of the magnetic field was interpreted as due to the uncoiling of the spiral spin structure of the alloy. 

The muon senses small variations (i.e., minor spin canting) even in otherwise well-established spin structures. It is mandatory that the pSR magnetic parameters and their temperature and/or pressure dependences be consistent with the findings of other methods, in particular with neutron scattering data. This task is far flrom completed in a number of systems studied thus far, and the pSR results indicate in these cases that the magnetic structure is not understood in all details. 

Lu2Fe3Si5 is isotypic with the crystal structure of Sc2Fc3Si5 P4/mnc, a = 10.34(1), c = 5.375(8) (Braun, 1980 X-ray powder diffraction data). For sample preparation, see Dy2Fe3Sij. Mossbauer data confirm the absence of a magnetic moment oh the iron site (Braun et al., 1981). Lu2Fe3Si5 is superconducting below 7 = 6.1-5.8 K. The pressure dependence was measured by Segre (1981) as dT dp... 

Goodenough and Zhou (this volume) review the temperature dependences of the resistivity p(T) and the thermoelectric power a(T) under different hydrostatic pressures P. These dependences, if used in conjunction with magnetic, structural, 0/ 0 isotope-exchange, and photoemission data, provide critical information about the different types of electron-lattice interactions that occur in any given system. 

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