<math>
  <msub>
    <mi>T</mi>
    <mi>c</mi>
  </msub>
</math>
 and the elastocaloric effect of 
<math>
  <mrow>
    <msub>
      <mi>Sr</mi>
      <mn>2</mn>
    </msub>
    <msub>
      <mi>RuO</mi>
      <mn>4</mn>
    </msub>
  </mrow>
</math>
 under 
<math>
  <mrow>
    <mo>〈</mo>
    <mn>110</mn>
    <mo>〉</mo>
  </mrow>
</math>
 uniaxial stress: No indications of transition splitting

Fabian Jerzembeck; You-Sheng Li; Grgur Palle; Zhenhai Hu; Mehdi Biderang; Naoki Kikugawa; Dmitry A. Sokolov; Sayak Ghosh; Brad J. Ramshaw; Thomas Scaffidi; Michael Nicklas; Jörg Schmalian; Andrew P. Mackenzie; Clifford W. Hicks

doi:10.1103/physrevb.110.064514

Journal article $T_{c}$ and the elastocaloric effect of ${Sr}_{2} {RuO}_{4}$ under $〈 110 〉$ uniaxial stress: No indications of transition splitting

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Fabian Jerzembeck, You-Sheng Li, Grgur Palle, Zhenhai Hu, Mehdi Biderang, Naoki Kikugawa, Dmitry A. Sokolov, Sayak Ghosh, Brad J. Ramshaw, Thomas Scaffidi, Michael Nicklas, Jörg Schmalian, Andrew P. Mackenzie, Clifford W. Hicks.

T_{c}

and the elastocaloric effect of

{Sr}_{2} {RuO}_{4}

under

〈 110 〉

uniaxial stress: No indications of transition splitting. Physical Review B. 2024, 110 (6), 064514. https://doi.org/10.1103/physrevb.110.064514

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(abstract)

There is considerable evidence that the superconductivity of Sr2RuO4 has two components. Among this evidence is a jump in the shear elastic modulus c66 at the critical temperature Tc, observed in ultrasound measurements. Such a jump is forbidden for homogeneous single-component order parameters, and implies that Tc should develop as a cusp under the application of shear strain with <110> principal axes. At low temperatures, this shear strain should split the onset temperatures of the two components, if they coexist, or select one component if they do not. Within experimental resolution, we resolve neither a cusp in the stress dependence of Tc, nor any second transition in the elastocaloric effect data. We show that reconciling these null results with the observed jumps in c66 requires extraordinarily fine tuning to a triple point of the Ginzburg-Landau parameter space. In addition, our results are inconsistent with homogeneous time reversal symmetry breaking at a temperature T2 < Tc as identified in muon spin relaxation experiments.

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