Sep, 2011
Pressure effect on critical temperature for superconductivity and lattice parameters of AlB2-type ternary silicide YbGa1.1Si0.9
PHYSICAL REVIEW B
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- Volume
- 84
- Number
- 10
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1103/PhysRevB.84.104520
- Publisher
- AMER PHYSICAL SOC
Electrical resistivity and x-ray diffraction measurements have been carried out to investigate the pressure effect on the critical temperature for superconductivity (T-C) and lattice parameters ofAlB(2)-type superconducting silicide YbGa1.1Si0.9 (T-C = 2.4 K) and its referencematerial CaGaSi (T-C = 4.5 K). The electrical resistivity measurements up to 2.5 GPa reveal that T-C decreases with pressure for both silicides and the pressure derivative of T-C (dT(C)/dP) is -0.78 K/GPa and -0.026 K/GPa for YbGa1.1Si0.9 and CaGaSi, respectively. X-ray diffraction measurements up to 3.5 GPa indicate both silicides do not exhibit structural changes in this pressure range and they have similar values for the bulk moduli: B-0 = 40 +/- 2 GPa for YbGa1.1Si0.9 and B-0 = 42 +/- 1 GPa for CaGaSi. The relative pressure derivative of T-C (dlnT(C)/dP) and logarithmic volume derivative of T-C (dlnT(C)/dlnV) are -0.33 GPa(-1) and 13 in YbGa1.1Si0.9. These values are about tenfold larger than those for other AlB2-type superconductors. Additionally, the origin of dlnT(C)/dP and dlnT(C)/dlnV in YbGa1.1Si0.9 relative to the pressure effect on the valence of Yb atoms is discussed.
- Link information
- ID information
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- DOI : 10.1103/PhysRevB.84.104520
- ISSN : 2469-9950
- eISSN : 2469-9969
- Web of Science ID : WOS:000295045000003