Determination of the cooper-pair mass in niobium

We have measured the ratio of Planck's constant {ital h} to the observable mass {ital m}{prime} of a Cooper pair in a superconductor, using a rotating superconducting ring. The flux through such a ring of area {ital S} is zero for a set of rotation frequencies evenly spaced by {Delta}{nu} and {...

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Veröffentlicht in:	Physical review. B, Condensed matter Condensed matter, 1990-11, Vol.42 (13A), p.7885-7893
Hauptverfasser:	TATE, J, FELCH, S. B, CABRERA, B
Format:	Artikel
Sprache:	eng
Schlagworte:	360104 - Metals & Alloys- Physical Properties Applied sciences Condensed matter: electronic structure, electrical, magnetic, and optical properties COOPER PAIRS ELECTRIC CONDUCTIVITY ELECTRICAL PROPERTIES ELECTRONIC STRUCTURE ELEMENTS Exact sciences and technology MATERIALS SCIENCE METALS Metals. Metallurgy NIOBIUM Other topics in superconductivity PHYSICAL PROPERTIES Physics PLANCK LAW SUPERCONDUCTIVITY TRANSITION ELEMENTS
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Beschreibung
Zusammenfassung:	We have measured the ratio of Planck's constant {ital h} to the observable mass {ital m}{prime} of a Cooper pair in a superconductor, using a rotating superconducting ring. The flux through such a ring of area {ital S} is zero for a set of rotation frequencies evenly spaced by {Delta}{nu} and {ital h}/2{pi}{ital m}{prime}=2{ital S}{Delta}{nu}. Our measurements of {ital S} and {Delta}{nu} enable us to quote a value of {ital m}{prime}/2{ital m}{sub {ital e}} for niobium of 1.000 084 (21). This result disagrees with predictions from currently available theories.
ISSN:	0163-1829 1095-3795
DOI:	10.1103/PhysRevB.42.7885