Nonfrustrated Interlayer Order and its Relevance to the Bose-Einstein Condensation of Magnons in BaCuSi2O6 / Mazurenko Vladimir V.,Valentyuk Maria V.,Stern Raivo,Tsirlin Alexander A. // PHYSICAL REVIEW LETTERS. - 2014. - V. 112, l. 10.

ISSN/EISSN:

0031-9007 / 1079-7114

Type:

Article

Abstract:

Han purple (BaCuSi2O6) is not only an ancient pigment, but also a valuable model material for studying Bose-Einstein condensation of magnons in high magnetic fields. Using precise low-temperature structural data and extensive density-functional calculations, we elucidate magnetic couplings in this compound. The resulting magnetic model comprises two types of nonequivalent spin dimers, in excellent agreement with the Cu-63,Cu-65 nuclear magnetic resonance data. We further argue that leading interdimer couplings connect the upper site of one dimer to the bottom site of the contiguous dimer, and not the upper-to-upper and bottom-to-bottom sites, as assumed previously. This finding is verified by inelastic neutron scattering data and implies the lack of frustration between the layers of spin dimers in BaCuSi2O6, thus challenging existing theories of the two-dimensional-like Bose-Einstein condensation of magnons in this compound.

Author keywords:

EXCHANGE INTERACTIONS; TEMPERATURE; INSULATORS; CRYSTAL; DENSITY

DOI:

10.1103/PhysRevLett.112.107202

Web of Science ID:

ISI:000332689000021

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAR 10
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	107202
EISSN	1079-7114
Keywords-Plus	EXCHANGE INTERACTIONS; TEMPERATURE; INSULATORS; CRYSTAL; DENSITY
Research-Areas	Physics
Web-of-Science-Categories	Physics, Multidisciplinary
Author-Email	mvv@dpt.ustu.ru raivo.stern@kbfi.ee altsirlin@gmail.com
ResearcherID-Numbers	Mazurenko, Vladimir/P-9241-2017 Stern, Raivo/A-5387-2008 Tsirlin, Alexander/D-6648-2013
ORCID-Numbers	Stern, Raivo/0000-0002-6724-9834 Tsirlin, Alexander/0000-0001-6916-8256
Funding-Acknowledgement	President of Russian Federation {[}MK-5565.2013.2]; Ministry of Education and Science of Russia {[}14.A18.21.0076, 14.A18.21.0889]; ESF via the Mobilitas program {[}MTT77]; Estonian Research Council {[}ETF8440, PUT210]
Funding-Text	The work of V. V. M. and M. V. V. was supported by the grant program of President of Russian Federation MK-5565.2013.2, the contracts of the Ministry of Education and Science of Russia N 14.A18.21.0076 and 14.A18.21.0889. A. T. acknowledges financial support from the ESF via the Mobilitas program (Grant No. MTT77). R. S. was funded by the Estonian Research Council (Grants No. ETF8440 and No. PUT210). We acknowledge essential discussions with Cristian Batista and Christian Ruegg as well as fruitful communication with Frederic Mila, Nicolas Laflorencie, Vladimir I. Anisimov, and Alexander I. Lichtenstein.
Number-of-Cited-References	32
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	50
Journal-ISO	Phys. Rev. Lett.
Doc-Delivery-Number	AC7EC