论文标题
约瑟夫森连接在单晶SR2RUO4中的Josephson连接处的自发出现
Spontaneous emergence of Josephson junctions in homogeneous rings of single-crystal Sr2RuO4
论文作者
论文摘要
Sr $ _ \ Mathsf {2} $ ruo $ _ \ Mathsf {4} $中的手性P-波订单参数将使它成为非常规超导体的特殊情况。这种对称的结果是可能存在相反手性的超导域的可能存在。在此类域的边界上，局部压制的冷凝水可以产生内在的约瑟夫森交界处。在这里，我们提供了使用介镜环的证据，该连接环由SR $ _ \ Mathsf {2} $ RUO $ $ _ \ MATHSF {4} $单晶构成。我们的订单参数模拟预测这种环将在其手臂上托管稳定的域壁。通过循环的运输实验进行了验证，在1.5 k处的急剧过渡，显示出与通量量子相对应的周期性的独特临界电流振荡。相比之下，在3 K左右的过渡的循环没有此类连接，并显示出标准的小公园振荡。我们的分析表明，连接具有内在起源，并为存在超导域的存在提供了令人信服的案例。
The chiral p-wave order parameter in Sr$_\mathsf{2}$RuO$_\mathsf{4}$ would make it a special case amongst the unconventional superconductors. A consequence of this symmetry is the possible existence of superconducting domains of opposite chirality. At the boundary of such domains, the locally supressed condensate can produce an intrinsic Josephson junction. Here, we provide evidence of such junctions using mesoscopic rings, structured from Sr$_\mathsf{2}$RuO$_\mathsf{4}$ single crystals. Our order parameter simulations predict such rings to host stable domain walls across their arms. Thisis verified with transport experiments on loops, with a sharp transition at 1.5 K, which show distinct critical current oscillations with periodicity corresponding to the flux quantum. In contrast, loops with broadened transitions at around 3 K are void of such junctions and show standard Little-Parks oscillations. Our analysis demonstrates the junctions are of intrinsic origin and makes a compelling case for the existence of superconducting domains.
