Dynamical spin susceptibility in weakly doped antiferromagnets

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.13826· OSTI ID:6129158

Becker, K W; Muschelknautz, U ^[1]

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1. Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-7000 Stuttgart 80 (Germany)

We study the dynamical spin susceptibility of a two-dimensional antiferromagnet that is weakly doped with mobile holes. The motion of the holes leads to a renormalization of the velocity [ital v] and of the linewidth of spin-wave excitations. In agreement with inelastic-neutron-scattering experiments for high-[ital T][sub [ital c]] superconductors [ital v] vanishes at a critical hole concentration [delta][sub [ital c]] of a few percent. This behavior is mainly due to the low energy or so-called coherent part of the hole motion and not to its incoherent part as was claimed recently. Therefore spin and hole excitations have the same energy scale and adiabiatic approximations are not allowed. Moreover, the system undergoes a magnetic phase transition at a critical hole-concentration value [delta][sub [ital c]]. At [delta][sub [ital c]] the transverse staggered susceptibility diverges for all wave vectors for which the spin-wave excitations [omega][sub [bold q]] are approximately linear in [bold q].

• OSTI ID: 6129158
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:18; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
BEAMS
HIGH-TC SUPERCONDUCTORS
HOLES
INELASTIC SCATTERING
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS
NEUTRON BEAMS
NUCLEON BEAMS
PARTICLE BEAMS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RENORMALIZATION
SCATTERING
SPIN WAVES
SUPERCONDUCTORS
TWO-DIMENSIONAL CALCULATIONS