Nuclear quadrupole spin-lattice relaxation in Bi{sub 4}Ge{sub 3}O{sub 12} single crystals doped with atoms of d or f elements. Crystal field effects in compounds exhibiting anomalous magnetic properties

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776110020135· OSTI ID:21443409

Sergeev, G S ^[1]; Asaji, Tetsuo ^[2]; Kravchenko, E A ^[3]; Kargin, Yu F ^[4]

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1. Russian Research Center 'Kurchatov Institute' (Russian Federation)
2. Nihon University, Department of Chemistry, College of Humanities and Sciences (Japan)
3. Russian Academy of Sciences, Institute of General and Inorganic Chemistry (Russian Federation)
4. Russian Academy of Sciences, State Institute of Metallurgy and Material Science (Russian Federation)

The nuclear quadrupole spin-lattice relaxation was studied in the range 4.2-300 K for single crystals of Bi{sub 4}Ge{sub 3}O{sub 12} doped with minor amounts (the tenth fractions of mol%) of paramagnetic atoms of Cr, Nd, and Gd. Unusual spin dynamic features were recently found for these crystals at room temperature: a dramatic (up to 8-fold) increase in the effective nuclear quadrupole spin-spin relaxation time T{sub 2}* occurred upon doping the pure Bi{sub 4}Ge{sub 3}O{sub 12} sample. Unlike T{sub 2}*, the effective spin-lattice relaxation time T{sub 1}* at room temperature differs insignificantly for both doped and pure samples. But at lower temperatures, the samples exhibit considerably different behavior of the spin-lattice relaxation with temperature, which is caused by different contributions to the relaxation process of the dopant paramagnetic atoms. The distinctive maximum in the temperature dependence of the spin-lattice relaxation time for the Nd-doped crystal is shown to result from the crystal electric field effects.

• OSTI ID: 21443409
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 110, Issue 2; Other Information: DOI: 10.1134/S1063776110020135; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATOMS
BISMUTH GERMANATES
CHROMIUM ADDITIONS
CRYSTAL FIELD
DOPED MATERIALS
ELECTRIC FIELDS
GADOLINIUM ADDITIONS
MAGNETIC PROPERTIES
MONOCRYSTALS
NEODYMIUM ADDITIONS
PARAMAGNETISM
SPIN-LATTICE RELAXATION
SPIN-SPIN RELAXATION
TEMPERATURE DEPENDENCE
ALLOYS
BISMUTH COMPOUNDS
CHROMIUM ALLOYS
CRYSTALS
GADOLINIUM ALLOYS
GERMANATES
GERMANIUM COMPOUNDS
MAGNETISM
MATERIALS
NEODYMIUM ALLOYS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RELAXATION
TRANSITION ELEMENT ALLOYS