期刊
NEW JOURNAL OF PHYSICS
卷 17, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/17/2/023041
关键词
heavy fermion; superconductivity; SANS; UPt3
资金
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering (University of Notre Dame) [DE-FG02-10ER46783]
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering (Northwestern University) [DE-FG02-10ER46783, DE-FG02-05ER46248]
- N D Glynn Family Honors program
- Notre Dame physics REU program
- National Science Foundation [DMR-0954342]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0954342] Funding Source: National Science Foundation
Spanning a broad range of physical systems, complex symmetry breaking is widely recognized as a hallmark of competing interactions. This is exemplified in superfluid He-3 which has multiple thermodynamic phases with spin and orbital quantum numbers S = 1 and L = 1, that emerge on cooling from a nearly ferromagnetic Fermi liquid. The heavy fermion compound UPt3 exhibits similar behavior clearly manifest in its multiple superconducting phases. However, consensus as to its order parameter symmetry has remained elusive. Our small angle neutron scattering measurements indicate a linear temperature dependence of the London penetration depth characteristic of nodal structure of the order parameter. Our theoretical analysis is consistent with assignment of its symmetry to an L = 3 odd parity state for which one of the three thermodynamic phases in non-zero magnetic field is chiral.
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