Spin-Peierls state versus Neel state in doped CuGeO[sub 3]

Journal Article · Mon Feb 20 04:00:00 EST 1995 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.74.1450· OSTI ID:6494676

Oseroff, S B; Cheong, S; Aktas, B; Hundley, M F; Fisk, Z; Rupp, Jr, L W ^[1]

---

1. 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), Journal Name: Physical Review Letters; (United States) Vol. 74:8; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL DOPING
ENERGY LEVELS
GERMANIUM COMPOUNDS
GERMANIUM OXIDES
GROUND STATES
MAGNETISM
MANGANESE ADDITIONS
MANGANESE ALLOYS
NEEL TEMPERATURE
NICKEL ADDITIONS
NICKEL ALLOYS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SILICON ADDITIONS
SILICON ALLOYS
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ZINC ADDITIONS
ZINC ALLOYS