FREEZING OF MAGNETIC-MOMENTS IN (ZN1-XMNX)3AS2 NEAR 200-K

Article

关键词: NEIGHBOR PERCOLATION LIMIT;    SPIN-GLASS;    SEMICONDUCTOR (ZN1-XMNX)3AS2;    PHASE-TRANSITIONS;    SUSCEPTIBILITY;    BEHAVIOR;    DIAGRAM;    FIELD;    HEAT;   

DOI  :  10.1103/PhysRevB.46.6251

来源: SCIE

【 摘 要 】

Magnetic properties of the semimagnetic semiconductor (Zn1-x,Mnx)3As2 (for short, ZMA) with 0.001 less-than-or-equal-to x less-than-or-equal-to 0.13 have been investigated at temperatures between 4 and 300 K. It is shown that the magnetic susceptibilities of the samples cooled in zero external field (ZFC) and in a field (FC) are different for compositions with x greater-than-or-equal-to 0.02. At Mn concentrations 0.08 less-than-or-equal-to x less-than-or-equal-to 0.13 freezing of the moments is observed around T(f) approximately 200 K. When increasing the field from a few oersteds to 90 Oe a gradual smearing out of the maximum in the ZFC susceptibility and decreasing of T(f) take place. The ac susceptibility data show a broad cusp at the freeezing temperature. These properties have a resemblance to the magnetic behavior of spin glasses. A spin-glass transition has been earlier reported in ZMA below 4 K by Denissen et al. [Phys. Rev. B 36, 5316 (1987)]. The existence of two spin-freezing phenomena in the same material at very different temperatures is an uncommon feature and may be attributed to the complex structure of ZMA.

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