Spin-Peierls state versus Neel state in doped CuGeO[sub 3]
- San Diego State University, San Diego, California 92182 (United States) AT T Bell Laboratories, Murray Hill, New Jersey 07974 (United States) University of California San Diego, San Diego, California 92093 (United States) Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
The competition between nonmagnetic spin-Peierls (SP) and magnetic Neel ground states has been investigated in CuGeO[sub 3] doped with Zn, Ni, Mn, and Si. The analysis of specific heat, [ital C][sub [ital p]], data in CuGeO[sub 3], measured as a function of magnetic field, supports a SP transition at [ital T][sub SP]=14K. The replacement of Cu[sup 2+] by Zn[sup 2+], Ni[sup 2+], or Mn[sup 2+] reduces [ital T][sub SP] and stabilizes a Neel state, not a spin-glass phase as previously suggested. No significant difference in [ital C][sub [ital p]] was observed for Zn- and Ni-doped samples. We suggest that the Neel state depends on [vert bar][ital S][prime][minus][ital S][vert bar], where [ital S][prime] is the spin of the dopant and [ital S]=1/2.
- OSTI ID:
- 6494676
- Journal Information:
- Physical Review Letters; (United States), Vol. 74:8; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER COMPOUNDS
MAGNETISM
GERMANIUM OXIDES
CRYSTAL DOPING
GROUND STATES
MANGANESE ADDITIONS
NEEL TEMPERATURE
NICKEL ADDITIONS
PHASE TRANSFORMATIONS
SILICON ADDITIONS
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
ZINC ADDITIONS
ALLOYS
CHALCOGENIDES
ENERGY LEVELS
GERMANIUM COMPOUNDS
MANGANESE ALLOYS
NICKEL ALLOYS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SILICON ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ZINC ALLOYS
360204* - Ceramics
Cermets
& Refractories- Physical Properties