Magnetic phase transitions in substituted spinels of Zn 1-xCuxCr2Se4; 0.0 ≤ x ≤ 0.3

M. Hidaka, N. Tokiwa, T. T. Wai, H. Fujii, K. Ohoyama, S. Mizusima, J. Sakaurai, F. Ichikawa, K. Itoh

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8 Citations (Scopus)

Abstract

Magnetic and crystallographic properties have been studied by neutron powder diffraction and measurements of magnetization and magnetization hysteresis-loops for substituted spinels of Zn1-xCu xCr2Se4 with 0.0 ≤ x ≤ 0.3. It is found that the Zn0.85Cu0.15Cr2Se4 spinel has two magnetic phase transitions at 23.0 K (Nécl temperature; T N) and 410 K (Curie temperature; TC) and that the Zn 0.70Cu0.30Cr2Se4 spinel has magnetic transitions at 24.5K (TN) and 415K (TC) on heating. The low-temperature magnetic phase transition is from a spiral antiferromagnet to a ferromagnet, and the high-temperature magnetic phase transition is from a ferromagnet to a paramagnet, while ZnCr2Se4 shows a magnetic phase transition only from a spiral antiferromagnet to a paramagnet at about 21.0K. From neutron powder diffraction, it is also found that the spinels of Zn1-xCuxCr2Se4; 0.0 ≤ x ≤ 0.3. show satellite-like magnetic reflection having indexes (h ± Q, k, l) with Q = 0.470 below TN and short-range order of spins (spin glass-like) above TN. The incommensurate antiferromagnetic phase below TN results from a spiral long-range order of the spins of Cr3+. The intermediate ferromagnetic phase between TN and TC is related not to the spiral spin order but to double-exchange magnetic interaction among Cr3+ and Cr4+ mediated by current carriers, positive holes, which is made by the substitution of Zn 2+ ions with Cu1+ ions in Zn1-xCu xCr2Se4.

Original languageEnglish
Pages (from-to)273-287
Number of pages15
JournalPhase Transitions
Volume75
Issue number3
DOIs
Publication statusPublished - 2002

Keywords

  • Magnetic phase transition
  • Spinel
  • Zncucrse

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)

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