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• W2019297514 abstract "We report $^{123}text{S}text{b}$ nuclear-quadrupole-resonance (NQR) measurements of the filled skutterudite heavy-fermion superconductor ${text{PrOs}}_{4}{text{Sb}}_{12}$ under high pressure. The temperature dependence of NQR frequency and the spin-lattice relaxation rate $1/{T}_{1}$ indicate that the crystal-electric-field splitting ${ensuremath{Delta}}_{text{CEF}}$ between the ground-state ${ensuremath{Gamma}}_{1}$ singlet and the first-excited-state ${ensuremath{Gamma}}_{4}^{(2)}$ triplet decreases with increasing pressure. ac-susceptibility measurements indicate that the superconducting transition temperature $({T}_{c})$ also decreases with increasing pressure. However, above $Pensuremath{sim}2text{ }text{GPa}$, both ${ensuremath{Delta}}_{text{CEF}}$ and ${T}_{c}$ do not depend on external pressure up to $P=3.82text{ }text{GPa}$. These pressure dependences of ${ensuremath{Delta}}_{text{CEF}}$ and ${T}_{c}$ suggest an intimate relationship between quadrupole excitations associated with the ${ensuremath{Gamma}}_{4}^{(2)}$ level and unconventional superconductivity in ${text{PrOs}}_{4}{text{Sb}}_{12}$. In the superconducting state, $1/{T}_{1}$ below ${T}_{c}=1.55$ and 1.57 K at $P=1.91$ and 2.63 GPa shows a power-law temperature variations and is proportional to ${Tphantom{rule{0.1em}{0ex}}}^{5}$ at temperatures considerably below ${T}_{c}$. These data can be well fitted by the gap model $ensuremath{Delta}(ensuremath{theta})={ensuremath{Delta}}_{0}text{ }text{sin}text{ }ensuremath{theta}$, with ${ensuremath{Delta}}_{0}=3.08{k}_{B}{T}_{c}$ and $3.04{k}_{B}{T}_{c}$ for $P=1.91$ and 2.63 GPa, respectively. The results indicate that there exist point nodes in the gap function." @default.
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• W2019297514 date "2008-08-12" @default.
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• W2019297514 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mtext>S</mml:mtext><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>123</mml:mn></mml:mrow></mml:mmultiscripts><mml:mtext>b</mml:mtext></mml:mrow></mml:math>-NQR study of unconventional superconductivity in the filled skutterudite heavy-fermion compound<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>PrOs</mml:mtext></mml:…" @default.
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• W2019297514 doi "https://doi.org/10.1103/physrevb.78.064510" @default.
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