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Spin dynamics in La sub 2 minus x Sr sub x CuO sub 4 (0. 02 le x le 0. 08) from sup 139 La NQR relaxation: Fluctuations in a finite-length-scale system

Journal Article · · Physical Review, B: Condensed Matter; (United States)
 [1];  [2]; ;  [1]
  1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
  2. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States) Departimento di Fisica, A. Volta'' Universita di Pavia, I-27100 Pavia (Italy)
+ Show Author Affiliations

{sup 139}La NQR spin-lattice relaxation rates (NSLR) versus temperature are presented for La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4} with {ital x}=0.02--0.08. The NSLR below {similar to}2{ital T}{sub {ital N}}({ital x}) shows a power-law critical behavior while above {similar to}2{ital T}{sub {ital N}}({ital x}) it follows an exponential law with a small {ital x}-dependent spin-stiffness constant, where {ital T}{sub {ital N}}({ital x}) is the magnetic ordering temperature. It is argued that the NSLR arises from fluctuations of the staggered magnetization in locally ordered mesoscopic domains. We infer that the magnetically ordered state is not a conventional spin glass, as is often assumed.

DOE Contract Number:
W-7405-ENG-82
OSTI ID:
7293117
Journal Information:
Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:5; ISSN PRBMD; ISSN 0163-1829
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
POWDERS
RARE EARTH COMPOUNDS
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS