Volume 120, Number 4, November 2017
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||09 February 2018|
Absence of quantum criticality and bulk 3D magnetism in green dioptase
1 ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory Didcot, OX11 0QX, UK
2 RIKEN Nishina Centre for Accelerator-Based Science - 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
3 Department of Physics, Durham University - South Road, Durham, DH1 3LE, UK
Received: 30 October 2017
Accepted: 22 January 2018
Green dioptase is a naturally occurring antiferromagnetic mineral that in recent years has been suggested as a candidate to exhibit quantum fluctuations at both above and below TN. Our work uses muon spectroscopy to study the dynamic and static properties of the magnetism in zero applied field. We observe the antiferromagnetic transition through tracking out the evolution of the muon spin precession frequency as a function of temperature. TN is calculated to be 15 K and the critical exponent of the transition matches with that of a 3D Heisenberg system. We also note that no evidence for any quantum magnetic fluctuations is observed either above or below TN.
PACS: 75.50.Ee – Antiferromagnetics / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 76.75.+i – Muon spin rotation and relaxation
© EPLA, 2018
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