Coexistence of Magnetism and Superconductivity in Hybrid Ruthenocuprates

该个人研究者奖支持一个项目，其目标是通过测量磁场和压力极端条件下的传输，磁性和热特性，加深对混合型钌-铜酸盐磁性超导体Ru-1212和Ru-1222的理解。 这些材料的晶体结构源自高Tc超导体YBa（2）Cu 3 O（7-x）（Tc接近90 K）的结构。 这些超导铜酸盐的一个独特的特点是，在45 K以下的超导状态与在较高温度下建立的弱铁磁性共存。 虽然这些层状材料从晶体学的角度来看是准二维的，但磁性和超导有序都是三维的，这表明Ru-O磁性层通过Cu-O层耦合，而超导Cu-O层通过Ru-O磁性层耦合。 这些实验将使我们更好地理解这些有趣的磁性超导体。该项目将为该机构的本科生和硕士生创造独特的研究，教育和指导机会。该项目的目标是通过测量在非常高的磁场和压力下的电，磁和热特性，对混合型铜氧-铜酸盐磁性超导体进行实验研究。 这些材料在结构上类似于高温超导体YBa（2）Cu 3 O（7-x），其在90 K以下显示零电阻。 这些超导铜酸盐的一个真正有趣的特征是，在45 K以下，磁序与超导性共存。 虽然这两种现象的共存是非常罕见的，这种材料的研究已经导致了许多重要的发现在过去。 由于超导铜氧化物是层状材料，可以想象，超导性和磁序共存的原因是超导Cu-O层和磁性Ru-O层之间的耦合很弱。 所提出的实验将使我们能够更好地了解这些极不寻常的磁性超导体。 该项目将为该机构的本科生和硕士生创造独特的研究，教育和指导机会。

This individual investigator award supports a project with the goal of gaining an increased understanding of the hybrid rutheno-cuprates magnetic superconductors known as Ru-1212 and Ru-1222, by means of measurements of transport, magnetic, and thermal properties in extreme conditions of magnetic field and pressure. The crystal structure of these materials is derived from the structure of the high-Tc superconductor YBa(2)Cu3O(7-x) (Tc near 90 K). A unique feature of these rutheno-cuprates is that the superconducting state below 45 K coexists with the weak ferromagnetism established at higher temperatures. Although these layered materials are quasi-two-dimensional from a crystallography point of view, both the magnetic and superconducting orders are three-dimensional, which suggests that the Ru-O magnetic layers couple through the Cu-O layers, while the superconducting Cu-O layers couple through the Ru-O magnetic layers. These experiments will permit a better understanding of these intriguing magnetic superconductors. This project will create unique research, educational, and mentoring opportunities for the undergraduate and Masters degree students at this institution.The goal of this project is to carry out an experimental study of the hybrid rutheno-cuprates magnetic superconductors, by means of measurements of electrical, magnetic, and thermal properties in very high magnetic fields and pressures. These materials are structurally similar to the high-temperature superconductor YBa(2)Cu3O(7-x), which shows zero electrical resistance below 90 K. A truly intriguing feature of these rutheno-cuprates is that the magnetic order coexists with superconductivity below 45 K. Although coexistence of these two phenomena is very rare, studies of such materials have lead to many important findings in the past. Since the rutheno-cuprates are layered materials, it is conceivable that the reason superconductivity and magnetic order coexist is that the coupling between the superconducting Cu-O layers and the magnetic Ru-O layers is weak. The experiments proposed will permit a better understanding of these quite unusual magnetic superconductors. This project will create unique research, educational, and mentoring opportunities for the undergraduate and Masters degree students at this institution.