Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-07-28
Phys. Rev. B 74, 054427 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.74.054427
The ultrasonic properties of La$_{1-x}$Ca$_{x}$MnO$_{3}$ ($x\approx 0.25$) with the Curie temperature $T_C$ about 200 K are studied. Temperature dependences of longitudinal and transverse sound velocities were measured in zero magnetic field and for different constant magnetic fields as well. The ultrasonic study is supported by magnetic, resistive, magnetoresistive, structural and other measurements of the sample that facilitate interpretation of the results obtained. The magnetic field influence on sound properties found in this study presents some new features of the interplay between the elastic and magnetic properties of these compounds. It is shown that the paramagnetic-ferromagnetic transition in the sample studied is first order, but can become second order under the influence of applied magnetic field.
Belevtsev B. I.
Beliayev Yu. E.
Fink-Finowicki J.
Galtsov N. N.
Kolobov I. G.
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