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Salamon, Myron B. Park, Tuson 2015-09-25T20:02:43Z 2015-09-25T20:02:43Z 10000-01-01 2003 2003 The gap function in unconventional superconductors may vanish at points or lines in momentum space, permitting electronic excitations, termed nodal quasiparticles, to exist at temperatures well below the superconducting transition. In the vortex phase, the presence of nodal quasiparticles should be directly observable through the variation of the heat capacity with the angle between a magnetic field and the location of the zeroes of the gap. The heat capacity of candidate non-magnetic unconventional superconductors YNi2B 2C and LuNi2B2C were found to exhibit fourfold oscillations with field angle, the first such observation. The observed angular variations are in quantitative agreement with theory, confirming that quasiparticles are created via Doppler shifts at a line of zeros normal to . These results demonstrate that field-angle-dependent heat capacity can be a powerful tool in probing the momentum-space gap structure in unconventional superconductors such as high Tc cuprates, borocarbides, etc. Made available in DSpace on 2015-09-25T20:02:43Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3086155.pdf: 5739201 bytes, checksum: 600d9c765aab893b99783e90511457ef (MD5) Previous issue date: 2003 Embargo set by: Seth Robbins for item 81771 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 145 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2003. http://hdl.handle.net/2142/80489 (MiAaPQ)AAI3086155 eng Engineering, Materials Science Direct Observation of Nodal Quasiparticles in the Non-Magnetic Superconductors Yttrium(lutetium)nickel-Boron-Carbon Field-Angle Dependent Heat Capacity text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.