Elastocaloric determination of the phase diagram of Sr${}_2$RuO${}_4$

Abstract

One of the main developments in unconventional superconductivity in the past two decades has been the discovery that most unconventional superconductors form phase diagrams that also contain other strongly correlated states. Many systems of interest are therefore close to more than one instability, and tuning between the resultant ordered phases is the subject of intense research1. In recent years, uniaxial pressure applied using piezoelectric-based devices has been shown to be a particularly versatile new method of tuning, leading to experiments that have advanced our understanding of the fascinating unconventional superconductor Sr${}_2$RuO${}_4$. Here we map out its phase diagram using high-precision measurements of the elastocaloric effect in what we believe to be the first such study including both the normal and the superconducting states. We observe a strong entropy quench on entering the superconducting state, in excellent agreement with a model calculation for pairing at the Van Hove point, and obtain a quantitative estimate of the entropy change associated with entry to a magnetic state that is observed in proximity to the superconductivity. The phase diagram is intriguing both for its similarity to those seen in other families of unconventional superconductors and for extra features unique, so far, to Sr${}_2$RuO${}_4$.

34 pages, 23 figures, published version, manuscript and supplementary information in one document

References in corpus (6)

• Theory of Intertwined Orders in High Temperature Superconductors
• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• High sensitivity heat capacity measurements on Sr2RuO4 under uniaxial pressure
• Grüneisen parameter studies on heavy fermion quantum criticality
• Elastocaloric signature of nematic fluctuations
• Frequency-dependent sensitivity of AC elastocaloric effect measurements explored through analytical and numerical models

Cited by in corpus (38)

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• Calorimetric evidence for two phase transitions in Ba${}_{1-\mathrm{x}}$K${}_{\mathrm{x}}$Fe${}_2$As${}_2$ with fermion pairing and quadrupling states
• Reversible Non-Volatile Electronic Switching in a Near Room Temperature van der Waals Ferromagnet
• Constraints on the superconducting state of Sr${}_2$RuO${}_4$ from elastocaloric measurements
• Elastocaloric signatures of symmetric and antisymmetric strain-tuning of quadrupolar and magnetic phases in DyB2C2
• Multiband mean-field theory of the $d+ig$ superconductivity scenario in Sr${}_2$RuO${}_4$
• $\mu$SR measurements on Sr${}_2$RuO${}_4$ under $⟨110⟩$ uniaxial stress
• Thermodynamic transitions and topology of spin-triplet superconductivity: Application to UTe${}_2$
• $T_c$ and the elastocaloric effect of Sr${}_2$RuO${}_4$ under $⟨110⟩$ uniaxial stress: no indications of transition splitting
• Resonant Ultrasound Spectroscopy for Irregularly-Shaped Samples and its Application to Uranium Ditelluride
• Competition between d-wave superconductivity and magnetism in uniaxially strained Sr2RuO4
• Pairing at a single Van Hove point
• Fate of density waves in the presence of a higher order van Hove singularity
• Quantum-geometry-induced anomalous Hall effect in nonunitary superconductors and application to Sr${}_2$RuO${}_4$
• Upper Critical Field of Sr${}_2$RuO${}_4$ under In-Plane Uniaxial Pressure
• Strain control of a bandwidth-driven spin reorientation in Ca${}_3$Ru${}_2$O${}_7$
• Pair-Kondo effect: a mechanism for time-reversal broken superconductivity in UTe${}_2$
• Giant elastocaloric effect at low temperatures in TmVO${}_4$ and implications for cryogenic cooling
• Uniaxial stress effect on the electronic structure of quantum materials
• Elastic Quantum Criticality in Nematics and Altermagnets via the Elasto-Caloric Effect
• Negatively enhanced thermopower near a Van Hove singularity in electron-doped Sr${}_2$RuO${}_4$
• Absence of spontaneous time-reversal symmetry breaking and ferromagnetism in superconducting NiBi3 single crystal
• Magnetic-field-tuned randomness in inhomogeneous altermagnets
• Nonlocal electrodynamics and the penetration depth of superconducting Sr${}_2$RuO${}_4$
• Direct evidence for the absence of coupling between shear strain and superconductivity in Sr2RuO4
• Strontium Ferrite Under Pressure: Potential Analogue to Strontium Ruthenate
• Realization of giant elastocaloric cooling at cryogenic temperatures in TmVO${}_4$ via a strain load/unload technique
• Multipolar Fermi Surface Deformations in Sr${}_2$RuO${}_4$ Probed by Resistivity and Sound Attenuation: A Window into Electron Viscosity and the Collision Operator
• Examining the possibility of chiral superconductivity in Sr${}_2$RuO${}_4$ and other compounds via applied supercurrent
• Resonant x-ray scattering study of charge-density wave correlations in YBa${}_2$Cu${}_3$O${}_{6+x}$ under uniaxial stress
• Frequency-Dependent Superconducting States From the Two-Time Linear Response Theory: Application To Sr${}_2$RuO${}_4$
• Why Scanning Tunneling Microscopy on Sr${}_2$RuO${}_4$ sometimes doesn't see the superconducting gap
• Anisotropic scattering rates in strain-tuned Sr${}_2$RuO${}_4$
• Probing multipolar order in the candidate altermagnet MnF${}_2$ through the elastocaloric effect under strain
• Ultrasonic Observation of Slowing Down of Multipole Fluctuations in Sr${}_2$RuO${}_4$
• Josephson effects in the spin-triplet superconductor/altermagnet/spin-triplet superconductor junctions: the detection of the intrinsic $\mathbf{d}$-vector
• Influence of Fermi Surface Geometry and Van Hove Singularities on the Optical Response of Sr${}_2$RuO${}_4$