Universität zu Köln

Sun, Chen, Nattermann, Thomas and Pokrovsky, Valery L. (2016). Unconventional Superfluidity in Yttrium Iron Garnet Films. Phys. Rev. Lett., 116 (25). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

We argue that the magnon condensate in yttrium iron garnet may display experimentally observable superfluidity at room temperature despite the 100 times dominance of the normal density over superfluid ones. The superfluidity has a more complicated nature than in known superfluids since the U(1) symmetry of the global phase shift is violated by the dipolar interaction leading to the exchange of spin moment between the condensate and the crystal lattice. It produces periodic inhomogeneity in the stationary superfluid flow. We discuss the manner of observation and possible applications of magnon superfluidity. It may strongly enhance the spin-torque effects and reduce the energy consumption of the magnonic devices.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sun, Chen UNSPECIFIED UNSPECIFIED UNSPECIFIED Nattermann, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Pokrovsky, Valery L. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-272036
DOI:	10.1103/PhysRevLett.116.257205
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	116
Number:	25
Date:	2016
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CONDENSATE Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27203