Coexisting static magnetic order and superconductivity in CeCu sub 2 Si sub 2 found by nuclear quadrupole resonance

Journal Article · Mon Dec 31 23:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.83· OSTI ID:6224599

Tien, C ^[1]

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1. Department of Physics, National Cheng Kung University, Tainan, Taiwan, Republic of China (TW)

{sup 63}Cu nuclear quadrupole resonance (NQR) has been observed in a heavy-fermion system CeCu{sub 2}Si{sub 2}. In the superconducting CeCu{sub 2}Si{sub 2} specimens ({ital T}{sub {ital c}}{congruent}0.6 K), NQR experiments have revealed an onset of a phase transition below {similar to}1 K. Zero- and longitudinal-field muon-spin-relaxation measurements suggest a static magnetic ordering below {similar to}0.8 K, either in the spin-glass or in incommensurate spin-density-wave states. The exotic transition observed in NQR measurements should be closely related to the static magnetic ordering in muon-spin-relaxation measurements. NQR data from a nonsuperconducting CeCu{sub 2}Si{sub 2} sample are consistent with extensive disorder in Cu site occupation. Therefore, the spin-density wave may be depressed in the nonsuperconducting CeCu{sub 2}Si{sub 2}. The superconducting transition temperature {ital T}{sub {ital c}} can be enhanced by the presence of spin-density waves such that, if the spin-density wave is depressed, CeCu{sub 2}Si{sub 2} will lose its superconducting properties.

• OSTI ID: 6224599
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:1; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CERIUM COMPOUNDS
CERIUM SILICIDES
COPPER 63
COPPER COMPOUNDS
COPPER ISOTOPES
COPPER SILICIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MAGNETIC PROPERTIES
MUON SPIN RELAXATION
NUCLEAR QUADRUPOLE RESONANCE
NUCLEI
ODD-EVEN NUCLEI
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RELAXATION
RESONANCE
SILICIDES
SILICON COMPOUNDS
SPIN GLASS STATE
SPIN WAVES
STABLE ISOTOPES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE