UTe2中不存在向密度波相转变的体热力学相变
Absence of a Bulk Thermodynamic Phase Transition to a Density Wave Phase in UTe2
AI总结：
针对扫描隧道显微镜观测到UTe2中存在与超导共存的电荷密度波的结论，该研究通过高精度弹性模量热力学测量，发现UTe2无体电荷密度波序，推测观测到的密度波可能仅存在于表面。
摘要：
在强关联电子系统中，竞争且相互交织的序是普遍存在的，例如高温铜氧化物超导体中的电荷序、自旋序和超导序。近期的扫描隧道显微镜（STM）测量提供了证据，表明在重费米子金属UTe2中存在一种与超导共存的电荷密度波（CDW）。这种CDW至少能持续到7.5 K，并且由于CDW会破坏晶格的平移对称性，它的消失必然伴随着热力学相变。在此，我们报道了对UTe2弹性模量的高精度热力学测量。我们在弹性模量中未观测到相变的特征，检测精度达到10^7分之一，这有力地表明UTe2中不存在体CDW序。我们认为，STM观测到的CDW及相关的配对密度波（PDW）可能仅局限于UTe2的表面。
英文摘要：
Competing and intertwined orders are ubiquitous in strongly correlated electron systems, such as the charge, spin, and superconducting orders in the high-Tc cuprates. Recent scanning tunneling microscopy (STM) measurements provide evidence for a charge density wave (CDW) that coexists with superconductivity in the heavy Fermion metal UTe2. This CDW persists up to at least 7.5 K and, as a CDW breaks the translational symmetry of the lattice, its disappearance is necessarily accompanied by thermodynamic phase transition. Here, we report high-precision thermodynamic measurements of the elastic moduli of UTe2. We observe no signature of a phase transition in the elastic moduli down to a level of 1 part in 10^7, strongly implying the absence of bulk CDW order in UTe2. We suggest that the CDW and associated pair density wave (PDW) observed by STM may be confined to the surface of UTe2.
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