BoseEinstein condensation of triplons close to the quantum critical point in the quasionedimensional spin$$\frac{1}{2}$$ antiferromagnet $$\mathrm{NaVOPO_4}$$
Abstract
Structural and magnetic properties of a quasionedimensional spin$$\frac{1}{2}$$ compound $$\mathrm{NaVOPO_4}$$ are explored by xray diffraction, magnetic susceptibility, highfield magnetization, specific heat, electron spin resonance, and $$\mathrm{^{31}P}$$ nuclear magnetic resonance measurements, as well as complementary ab initio calculations. Whereas magnetic susceptibility of $$\mathrm{NaVOPO_4}$$ 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 $α ≃ 0.98$ and the ensuing zerofield spin gap $$Δ_0/k_B ≃ 2.4 K$$ directly probed by fielddependent magnetization measurements. No longrange order is observed down to 50 mK in zero field. However, applied fields above the critical field $$H_{c1} ≃ 1.6 T$$ give rise to a magnetic ordering transition with the phase boundary $$T_N ∝(H  H_{c1})^{\frac{1}{Φ}}$$, where $Φ ≃ 1.8$ is close to the value expected for BoseEinstein condensation of triplons. Finally, with its weak alternation of the exchange couplings and small spin gap, $$\mathrm{NaVOPO_4}$$ lies close to the quantum critical point.
 Authors:

 Indian Inst. of Science Education and Research, Pune (India). School of Physics
 Max Planck Inst. for Chemical Physics, Dresden (Germany)
 HelmholtzZentrum DresdenRossendorf, Dresden (Germany). Dresden High Magnetic Field Lab. (HLDEMFL)
 Kyushu Univ., Fukuoka (Japan). Dept. of Applied Quantum Physics, Faculty of Engineering; Iowa State Univ., Ames, IA (United States). Dept. of Electrical and Computer Engineering
 Iowa State Univ., Ames, IA (United States). Dept. of Electrical and Computer Engineering
 Univ. of Augsburg (Germany). Inst. of Physics, Center for Electronic Correlations and Magnetism
 Publication Date:
 Research Org.:
 Ames Lab., Ames, IA (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Basic Energy Sciences (BES)
 OSTI Identifier:
 1572382
 Report Number(s):
 ISJ 10064
Journal ID: ISSN 24699950; PRBMDO; TRN: US2100043
 Grant/Contract Number:
 37(3)/14/26/2017BRNS; AC0207CH11358
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 100; Journal Issue: 14; Journal ID: ISSN 24699950
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Mukharjee, Prashanta K., Ranjith, K. M., Koo, B., Sichelschmidt, J., Baenitz, M., Skourski, Y., Inagaki, Y., Furukawa, Y., Tsirlin, A. A., and Nath, R. BoseEinstein condensation of triplons close to the quantum critical point in the quasionedimensional spin$\frac{1}{2}$ antiferromagnet $\mathrm{NaVOPO_4}$. United States: N. p., 2019.
Web. doi:10.1103/PhysRevB.100.144433.
Mukharjee, Prashanta K., Ranjith, K. M., Koo, B., Sichelschmidt, J., Baenitz, M., Skourski, Y., Inagaki, Y., Furukawa, Y., Tsirlin, A. A., & Nath, R. BoseEinstein condensation of triplons close to the quantum critical point in the quasionedimensional spin$\frac{1}{2}$ antiferromagnet $\mathrm{NaVOPO_4}$. United States. doi:10.1103/PhysRevB.100.144433.
Mukharjee, Prashanta K., Ranjith, K. M., Koo, B., Sichelschmidt, J., Baenitz, M., Skourski, Y., Inagaki, Y., Furukawa, Y., Tsirlin, A. A., and Nath, R. Fri .
"BoseEinstein condensation of triplons close to the quantum critical point in the quasionedimensional spin$\frac{1}{2}$ antiferromagnet $\mathrm{NaVOPO_4}$". United States. doi:10.1103/PhysRevB.100.144433. https://www.osti.gov/servlets/purl/1572382.
@article{osti_1572382,
title = {BoseEinstein condensation of triplons close to the quantum critical point in the quasionedimensional spin$\frac{1}{2}$ antiferromagnet $\mathrm{NaVOPO_4}$},
author = {Mukharjee, Prashanta K. and Ranjith, K. M. and Koo, B. and Sichelschmidt, J. and Baenitz, M. and Skourski, Y. and Inagaki, Y. and Furukawa, Y. and Tsirlin, A. A. and Nath, R.},
abstractNote = {Structural and magnetic properties of a quasionedimensional spin$\frac{1}{2}$ compound $\mathrm{NaVOPO_4}$ are explored by xray diffraction, magnetic susceptibility, highfield magnetization, specific heat, electron spin resonance, and $\mathrm{^{31}P}$ nuclear magnetic resonance measurements, as well as complementary ab initio calculations. Whereas magnetic susceptibility of $\mathrm{NaVOPO_4}$ 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 $α ≃ 0.98$ and the ensuing zerofield spin gap $Δ_0/k_B ≃ 2.4 K$ directly probed by fielddependent magnetization measurements. No longrange order is observed down to 50 mK in zero field. However, applied fields above the critical field $H_{c1} ≃ 1.6 T$ give rise to a magnetic ordering transition with the phase boundary $T_N ∝(H  H_{c1})^{\frac{1}{Φ}}$, where $Φ ≃ 1.8$ is close to the value expected for BoseEinstein condensation of triplons. Finally, with its weak alternation of the exchange couplings and small spin gap, $\mathrm{NaVOPO_4}$ lies close to the quantum critical point.},
doi = {10.1103/PhysRevB.100.144433},
journal = {Physical Review B},
number = 14,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}
Web of Science
Figures / Tables:
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