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  Bose-Einstein condensation of triplons close to the quantum critical point in the quasi-one-dimensional spin-1/2 antiferromagnet NaVOPO4

Mukharjee, P. K., Ranjith, K. M., Koo, B., Sichelschmidt, J., Baenitz, M., Skourski, Y., et al. (2019). Bose-Einstein condensation of triplons close to the quantum critical point in the quasi-one-dimensional spin-1/2 antiferromagnet NaVOPO4. Physical Review B, 100(14): 144433, pp. 1-14. doi:10.1103/PhysRevB.100.144433.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-19A3-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-19A5-5
Genre: Journal Article

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 Creators:
Mukharjee, Prashanta Kumar1, Author
Ranjith, K. M.2, Author              
Koo, B.2, Author              
Sichelschmidt, J.3, Author              
Baenitz, M.4, Author              
Skourski, Y.1, Author
Inagaki, Y.1, Author
Furukawa, Y.1, Author
Tsirlin, A. A.1, Author
Nath, R.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Jörg Sichelschmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863468              
4Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              

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 Abstract: Structural and magnetic properties of a quasi-one-dimensional spin-1/2 compound NaVOPO4 are explored by x-ray diffraction, magnetic susceptibility, high-field magnetization, specific heat, electron spin resonance, and P-31 nuclear magnetic resonance measurements, as well as complementary ab initio calculations. Whereas magnetic susceptibility of NaVOPO4 may be compatible with the gapless uniform spin chain model, detailed examination of the crystal structure reveals a weak alternation of the exchange couplings with the alternation ratio alpha similar or equal to 0.98 and the ensuing zero-field spin gap Delta(0)/k(B) similar or equal to 2.4 K directly probed by field-dependent magnetization measurements. No long-range order is observed down to 50 mK in zero field. However, applied fields above the critical field H-c1 similar or equal to 1.6 T give rise to a magnetic ordering transition with the phase boundary T-N proportional to (H - H-c(1))(1/phi), where phi similar or equal to 1.8 is close to the value expected for Bose-Einstein condensation of triplons. With its weak alternation of the exchange couplings and small spin gap, NaVOPO4 lies close to the quantum critical point.

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Language(s): eng - English
 Dates: 2019-10-252019-10-25
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 100 (14) Sequence Number: 144433 Start / End Page: 1 - 14 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008