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  Magnetic properties and heat capacity of the three-dimensional frustrated S=1/2 antiferromagnet PbCuTe2O6

Koteswararao, B., Kumar, R., Khuntia, P., Bhowal, S., Panda, S. K., Rahman, M. R., et al. (2014). Magnetic properties and heat capacity of the three-dimensional frustrated S=1/2 antiferromagnet PbCuTe2O6. Physical Review B, 90(3): 035141, pp. 1-7. doi:10.1103/PhysRevB.90.035141.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0023-DFEB-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-778A-5
Genre: Journal Article

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 Creators:
Koteswararao, B.1, Author
Kumar, R.1, Author
Khuntia, P.2, Author              
Bhowal, Sayantika1, Author
Panda, S. K.1, Author
Rahman, M. R.1, Author
Mahajan, A. V.1, Author
Dasgupta, I.1, Author
Baenitz, M.3, Author              
Kim, Kee Hoon1, Author
Chou, F. C.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              

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 Abstract: We report magnetic susceptibility (χ) and heat capacity (Cp) measurements along with ab initio electronic structure calculations on PbCuTe2O6, a compound made up of a three-dimensional (3D) network of corner-shared triangular units. The presence of antiferromagnetic interactions is inferred from a Curie-Weiss temperature (θCW) of about −22 K from the χ(T) data. The magnetic heat capacity Cm data show a broad maximum at Tmax≃1.15 K (i.e., Tmax/θCW≃0.05), which is analogous to the the observed broad maximum in the Cm/T data of a hyper-kagome system, Na4Ir3O8. In addition, Cm data exhibit a weak kink at T∗≃0.87 K. While the Tmax is nearly unchanged, the T∗ is systematically suppressed in an increasing magnetic field (H) up to 80 kOe. For H≥80 kOe, the Cm data at low temperatures exhibit a characteristic power-law (Tα) behavior with an exponent α slightly less than 2. Hopping integrals obtained from the electronic structure calculations show the presence of strongly frustrated 3D spin interactions along with non-negligible unfrustrated couplings. Our results suggest that PbCuTe2O6 is a candidate material for realizing a 3D quantum spin liquid state at high magnetic fields.

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 Dates: 2014-07-29
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: DOI: 10.1103/PhysRevB.90.035141
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Title: Physical Review B
  Other : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 90 (3) Sequence Number: 035141 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008