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Title: Magnetic ground state and magnetic excitations in black dioptase Cu 6 Si 6 O 18

Journal Article · · Physical Review B

The low-temperature magnetic properties and magnetic structure of fully dehydrated black dioptase Cu 6 Si 6 O 18 have been studied by single-crystal neutron diffraction and magnetization measurements in magnetic fields up to 30 T. Here, the intrachain J c and interchain J a b interactions as well as the anisotropy of the exchange coupling J c have been determined using inelastic neutron-scattering techniques. Zero-field antiferromagnetic order at T N = 6.7 K can be described by a commensurate propagation vector of k = ( 0 , 0 , 3 / 2 ) with respect to the hexagonal R 3 ¯ :H unit cell. The Cu magnetic moments are aligned antiferromagnetically along the c axis with about 12° tilt and are coupled ferromagnetically between the chains. The high-field magnetization measurements provide strong evidence for the presence of a spin-flop phase above 8 T. We found that J c in black dioptase is significantly increased, while J a b is much weaker compared to its counterpart, green dioptase Cu 6 [ Si 6 O 18 ] 6 H 2 O . We suggest that black dioptase behaves like a nearly ideal S = 1 / 2 antiferromagnetic Heisenberg spiral chain with enhanced quantum fluctuations and weak spinon confinement J a b / J c ~ 0.02 .

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1607105
Journal Information:
Physical Review B, Vol. 100, Issue 18; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

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