Coexisting static magnetic order and superconductivity in CeCu sub 2 Si sub 2 found by nuclear quadrupole resonance
- 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), Vol. 43:1; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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MAGNETIC PROPERTIES
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NUCLEAR QUADRUPOLE RESONANCE
COPPER SILICIDES
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SPIN GLASS STATE
SPIN WAVES
TRANSITION TEMPERATURE
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CERIUM COMPOUNDS
COPPER COMPOUNDS
COPPER ISOTOPES
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INTERMEDIATE MASS NUCLEI
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NUCLEI
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SILICIDES
SILICON COMPOUNDS
STABLE ISOTOPES
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360603* - Materials- Properties