Nuclear {sup 111}Cd probes detect a hidden symmetry change at the {gamma} {sup {yields} {alpha}} transition in cerium considered isostructural for 60 years

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776110100134· OSTI ID:21443367

Nikolaev, A V ^[1]; Velichkov, A I; Salamatin, A V ^[2]; Fomicheva, L N ^[3]; Ryasny, G K; Sorokin, A A ^[1]; Kochetov, O I ^[2]; Budzynski, M ^[4]

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1. Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics (Russian Federation)
2. Joint Institute for Nuclear Research (Russian Federation)
3. Russian Academy of Sciences, Vereshchagin Institute for High Pressure Physics (Russian Federation)
4. Curie-Sklodowska University, Institute of Physics (Poland)

We use the time-differential perturbed angular correlation technique to study nuclear electric quadrupole hyperfine interactions of probe {sup 111}Cd nuclei in cerium lattice sites at room temperature under pressures up to 8 GPa. We have found that the well known {gamma} {sup {yields} {alpha}} phase transition in cerium is not isostructural. In {alpha}-Ce, the probe {sup 111}Cd nuclei reveal a quadrupole electron charge density component that is absent in {gamma}-Ce. The hidden spacial structure of electronic quadrupoles in {alpha}-Ce is triple-q antiferroquadrupolar, as was suggested in [14]. We relate our findings to the current understanding of the {gamma} {sup {yields} {alpha}} phase transition and also report on nuclear quadrupole interactions in other high-pressure phases of cerium: {alpha}'' (C2/m space symmetry) and {alpha}' ({alpha}-U structure).

• OSTI ID: 21443367
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 111, Issue 4; Other Information: DOI: 10.1134/S1063776110100134; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CADMIUM 111
CERIUM-ALPHA
CHARGE DENSITY
ELECTRONS
MONOCLINIC LATTICES
PERTURBED ANGULAR CORRELATION
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
QUADRUPOLES
SYMMETRY
TEMPERATURE RANGE 0273-0400 K
URANIUM-ALPHA
ACTINIDES
ANGULAR CORRELATION
CADMIUM ISOTOPES
CERIUM
CORRELATIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELEMENTARY PARTICLES
ELEMENTS
EVEN-ODD NUCLEI
FERMIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEPTONS
METALS
MINUTES LIVING RADIOISOTOPES
MULTIPOLES
NUCLEI
PRESSURE RANGE
RADIOISOTOPES
RARE EARTHS
STABLE ISOTOPES
TEMPERATURE RANGE
URANIUM