Haskel, D;
Fabbris, G;
Kim, JH;
Veiga, LSI;
Mardegan, JRL;
Escanhoela, CA;
Chikara, S;
... Kim, J-W; + view all
(2020)
Possible Quantum Paramagnetism in Compressed Sr2IrO4.
Physical Review Letters
, 124
(6)
10.1103/PhysRevLett.124.067201.
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Abstract
The effect of compression on the magnetic ground state of Sr 2 IrO 4 is studied with x-ray resonant techniques in the diamond anvil cell. The weak interlayer exchange coupling between square-planar 2D IrO 2 layers is readily modified upon compression, with a crossover between magnetic structures around 7 GPa mimicking the effect of an applied magnetic field at ambient pressure. Higher pressures drive an order-disorder magnetic phase transition with no magnetic order detected above 17–20 GPa. The persistence of strong exchange interactions between J eff = 1 / 2 magnetic moments within the insulating IrO 2 layers up to at least 35 GPa points to a highly frustrated magnetic state in compressed Sr 2 IrO 4 , opening the door for realization of novel quantum paramagnetic phases driven by extended 5 d orbitals with entangled spin and orbital degrees of freedom.
| Type: | Article |
|---|---|
| Title: | Possible Quantum Paramagnetism in Compressed Sr2IrO4 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.124.067201 |
| Publisher version: | https://doi.org/10.1103/PhysRevLett.124.067201 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10093509 |
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