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Structural and double magnetic transitions in the frustrated spin- 12 capped-kagome antiferromagnet (RbCl) Cu5 P2 O10

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [1]
  1. Indian Institute of Science Education and Research, Thiruvananthapuram (India)
  2. Ames Laboratory, and Iowa State University, Ames, IA (United States)
+ Show Author Affiliations

The structural and magnetic properties of the geometrically frustrated spin- 12 capped-kagome antiferromagnet (RbCl) Cu5P2O10 are investigated via temperature-dependent x-ray diffraction, magnetization, heat capacity, and 31P NMR experiments on a polycrystalline sample. It undergoes a structural transition at around Tt ≃ 310 K from a high-temperature trigonal (P ¯3m1) to a low-temperature monoclinic (C2/c) unit cell, where the low-temperature structure features the capped-kagome geometry of Cu2+ ions. Interestingly, it shows the onset of two successive magnetic transitions at TN1 ≃ 20 K and TN2 ≃ 7 K. The shape of the 31P NMR spectra unfolds the possible nature of the transitions below TN1 and TN2 to be of incommensurate and commensurate antiferromagnetic type, respectively. A large value of the Curie-Weiss temperature as compared to TN1 sets the frustration parameter f ≃ 8, ensuring strong magnetic frustration in the compound. From the 31P NMR spin-lattice relaxation rate, the leading antiferromagnetic exchange coupling is estimated to be J/kB ≃ 117 K. Furthermore, these unusual double magnetic transitions make this compound beguiling for further investigations.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
2008093
Report Number(s):
IS-J--11,162
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 10 Vol. 108; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (12)

FIG. 1(p. 3)figure FIG. 1
TABLE I(p. 3)table TABLE I
FIG. 2(p. 4)figure FIG. 2
FIG. 3(p. 4)figure FIG. 3
FIG. 4(p. 5)figure FIG. 4
FIG. 5(p. 5)figure FIG. 5
TABLE II(p. 5)table TABLE II
FIG. 6(p. 6)figure FIG. 6
FIG. 7(p. 7)figure FIG. 7
FIG. 8(p. 7)figure FIG. 8
FIG. 9(p. 8)figure FIG. 9
FIG. 10(p. 9)figure FIG. 10

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Antiferromagnets
Frustrated magnetism
Kagome lattice
Magnetic order