Magnetic Relaxation Behavior in Nd$_{0.5}$Sr$_{0.5}$MnO$_{3}$: Observation of Negative Imaginary Component of ac Magnetic Susceptibility

Abstract

Short time relaxation effect in Nd 0 5 Sr 0 5 MnO 3 manganites was observed. The effect is manifested as negative peak of imaginary component of ac magnetic susceptibility near the point of first order phase transition. The effect is explained at the frame of Landau theory of phase transition, where the coexistence of metastable and stable phases is considered.

Calibration of low-temperature ac susceptometers with a copper cylinder standard

“…[6][7][8][9][10] Although such results are unphysical, it is still interesting to study each case, so that the ac susceptibility technique can be improved. Careful calibration using proper standard samples is necessary for such a study.…”

“…Few researchers emphasize the accuracy of their measured susceptibilities, and when a negative imaginary susceptibility is obtained, the correctness of the measured results is the first question to be asked and is often not answered. [6][7][8][9][10] We study this topic in the present work.…”

Nearly compensated ferrimagnetic behaviour and giant exchange bias of hexagonal Mn2PtAl: experimental and theoretical studies

“…This may be due to the change of a nearly FI state to a non-collinear state under the excitation field. 26…”

Influence of Ruthenium Doping on the Crystal Structure and Magnetic Properties of Pr0.67Ba0.33Mn1–xRuxO3 Manganites

“…In χ", a sharp peak was observed at 134 and 155 K for Pr 0.67 Ba 0.33 MnO 3 and Pr 0.67 Ba 0.33 Mn 0.9 Ru 0.1 O 3 , respectively. The negative χ" component for Pr 0.67 Ba 0.33 MnO 3 at~200 K can be attributed to the coexistence of metastable and stable phases in the magnetic materials [29]. This curve also shows a small shoulder at around 100 K, which indicates that secondary magnetic phase transitions or domain wall interactions exist in the sample.…”