Phase transitions in a quasi-two-dimensional XY random magnetic system
The phase transitions of a randomly mixed quasi-two-dimensional antiferromagnet and ferromagnet Rb/sub 2/Mn/sub 1-//sub x/Cr/sub x/Cl/sub 4/ have been studied experimentally using ac susceptibility (chi), magnetization, and neutron scattering techniques. A characterization of the single crystals of Rb/sub 2/Mn/sub 1-//sub x/Cr/sub x/Cl/sub 4/ grown for this study is made with ac chi and electron-spin-resonance measurements. It turns out that the mixed system is a typical example of an XY magnet in the concentration range 0.1approx. <1.0. The concentration versus transition-temperature (x-T) phase diagram of this alloy under zero external magnetic field is constructed. The transition temperature from the paramagnetic (PM) to the antiferromagnetic phase decreases rapidly with increasing Cr concentration. A transition from the PM phase to the spin-glass (SG) phase is observed in the concentration region 0.34less than or equal tox<0.5. The mixed crystals with the concentrations 0.50less than or equal tox<1.0 show a reentrant spin-glass (RSG) transition; a sequence of transitions from the PM to ferromagnetic (FM) phase and from the FM phase to SG at a lower temperature. Qualitatively, the x-T phase diagram of Rb/sub 2/Mn/sub 1-//sub x/Cr/sub x/Cl/sub 4/ is explained by the theories on competing exchange interactions. The RSG transition is discussed in the context of recent theories on the two-dimensional XY spin glass.
- Research Organization:
- The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-01, Japan
- OSTI ID:
- 5677777
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 37:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM CHLORIDES
PHASE TRANSFORMATIONS
MANGANESE CHLORIDES
RUBIDIUM CHLORIDES
CRYSTAL STRUCTURE
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
MONOCRYSTALS
NEUTRON DIFFRACTION
PHASE DIAGRAMS
SPIN GLASS STATE
ALKALI METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM COMPOUNDS
COHERENT SCATTERING
CRYSTALS
DIAGRAMS
DIFFRACTION
HALIDES
HALOGEN COMPOUNDS
MAGNETIC PROPERTIES
MANGANESE COMPOUNDS
MANGANESE HALIDES
PHYSICAL PROPERTIES
RUBIDIUM COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
360603* - Materials- Properties