Phase Diagram for Magnon Condensate in Yttrium Iron Garnet Film

Li, Fuxiang; Saslow, Wayne M.; Pokrovsky, Valery L.

doi:10.1038/srep01372

Title: Phase Diagram for Magnon Condensate in Yttrium Iron Garnet Film

Journal Article · Mon Mar 04 00:00:00 EST 2013 · Scientific Reports

DOI:https://doi.org/10.1038/srep01372· OSTI ID:1624598

Li, Fuxiang ^[1]; Saslow, Wayne M. ^[1]; Pokrovsky, Valery L. ^[2]

Texas A & M Univ., College Station, TX (United States)/ Dept. of Physics
Texas A & M Univ., College Station, TX (United States)/ Dept. of Physics; Landau Inst. for Theoretical Physics, Chernogolovka (Russian Federation)

Recently, magnons, which are quasiparticles describing the collective motion of spins, were found to undergo Bose-Einstein condensation (BEC) at room temperature in films of Yttrium Iron Garnet (YIG). Unlike other quasiparticle BEC systems, this system has a spectrum with two degenerate minima, which makes it possible for the system to have two condensates in momentum space. Recent Brillouin Light Scattering studies for a microwave-pumped YIG film of thickness d 5 5 mm and field H 5 1 kOe find a low-contrast interference pattern at the characteristic wavevector Q of the magnon energy minimum. In this report, we show that this modulation pattern can be quantitatively explained as due to unequal but coherent Bose-Einstein condensation of magnons into the two energy minima. Our theory predicts a transition from a high-contrast symmetric state to a low-contrast non-symmetric state on varying the d and H, and a new type of collective oscillation.

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Research Organization:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-06ER46278

OSTI ID:: 1624598

Journal Information:: Scientific Reports, Vol. 3, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (10)

Yttrium Iron Garnet Thin Films with Very Low Damping Obtained by Recrystallization of Amorphous Material Hauser, Christoph; Richter, Tim; Homonnay, Nico Scientific Reports, Vol. 6, Issue 1 https://doi.org/10.1038/srep20827	journal	February 2016
Rayleigh-Jeans Condensation of Pumped Magnons in Thin-Film Ferromagnets Rückriegel, Andreas; Kopietz, Peter Physical Review Letters, Vol. 115, Issue 15 https://doi.org/10.1103/physrevlett.115.157203	journal	October 2015
Unconventional Superfluidity in Yttrium Iron Garnet Films Sun, Chen; Nattermann, Thomas; Pokrovsky, Valery L. Physical Review Letters, Vol. 116, Issue 25 https://doi.org/10.1103/physrevlett.116.257205	journal	June 2016
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Possible Demonstration of a Polaronic Bose-Einstein(-Mott) Condensate in UO2(+x) by Ultrafast THz Spectroscopy and Microwave Dissipation Conradson, Steven D.; Gilbertson, Steven M.; Daifuku, Stephanie L. Scientific Reports, Vol. 5, Issue 1 https://doi.org/10.1038/srep15278	journal	October 2015
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Title: Phase Diagram for Magnon Condensate in Yttrium Iron Garnet Film

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