Career: From Strongly Correlated Insulator to Metal: Transport and Magnetic Properties of Carrier Doped Insulators

这项由材料研究部和刺激竞争研究的实验计划（EPSCoR）支持的实验性职业补助金将推进对轻掺杂半导体和绝缘体性质的认识，重点是磁性氧化物，例如通过适当掺杂转化为高温超导体的磁性氧化物。提出的工作将探索这种载流子掺杂强相关绝缘体的磁性和输运性质。将测量掺杂绝缘体的低温特性，以确定基态是处于绝缘状态的普通带绝缘体，还是处于金属状态的费米液体。这些材料的薄膜将被制作出来，以探索基于这些材料的小带隙和掺杂可控的磁基态制造电子器件的潜力。这项研究将被纳入一项教育计划，以帮助提高学生的学习并培养未来的科学家，包括少数民族科学家。PI的教育计划包括一门物理实验课程，既对他所在学院的学生开放，也对附近HBCU南方大学的学生开放。这个职业计划项目，由材料研究部和刺激竞争研究实验计划（EPSCoR）支持，涉及对半导体和绝缘体类别的基础实验研究，这些类别在过去十年中被发现，当材料适当地掺杂额外的化学元素时，会产生高温超导性，这些化学元素具有产生导电性的作用。这里要研究的材料在未掺杂状态下是磁性的，但当它们获得导电性时就失去了这种性质。这项工作的一个方面将是更广泛地评估基于这种材料的薄膜制造电子设备的机会。该项目的长期成果可能包括改进磁感应装置，例如用于计算机磁盘驱动器的磁感应装置。在教育方面，PI计划加强学生的学习并培养未来的科学家，包括那些来自代表性不足的少数群体的科学家。一门联合物理实验课程将向PI所在机构的学生和附近的南方大学的学生开放，南方大学是HBCU（历史上的黑人学院或大学）的学生。＊＊＊

w:\awards\awards96\num.doc 9702690 DiTusa This experimental CAREER grant, supported by the Division of Materials Research and the Experimental Program to Stimulate Competitive Research (EPSCoR) will advance the state of knowledge of the properties of lightly doped semiconductors and insulators, with emphasis on magnetic oxides such as those which have been transformed into high temperature superconductors by suitable doping. The proposed work will explore the magnetic and transport properties of such carrier-doped strongly-correlated insulators. The low temperature properties of doped insulators will be measured to determine if the ground states are ordinary band insulators in the insulating state, and Fermi liquids in the metallic state. Thin films of the materials will be produced to explore the potential of making electronic devices based on the small band gaps and the doping-controllable magnetic ground states of these materials. The research will be integrated into an education plan to help enhance student learning and to train future scientists, including minority scientists. The PI's education plan involves a physics laboratory course open to students from his own institution and also to students from the nearby HBCU Southern University. %%% This CAREER program project, supported by the Division of Materials Research and the Experimental Program to Stimulate Competitive Research (EPSCoR), involves fundamental experimental research on the classes of semiconductors and insulators which have in the past decade been found to yield high temperature superconductivity when the materials are suitably doped with additional chemical elements which have the effect of producing electrical conductivity. The materials to be studied here are magnetic in the undoped state, but lose this property as they gain electrical conductivity . One aspect of the work will be to assess more generally the opportunities to make electronic devices based on thin films of such materials. The long term results of this project may include improved magnetic sensing devices, such as are used in computer magnetic disk drives. On the educational side the PI plans to enhance student learning and to train future scientists, including those from under- represented minority groups. A joint physics laboratory course will be featured which is open to students of the PI's institution and also to students from the nearby Southern University, which is in the HBCU class (Historically Black College or University). ***