Sayantika Bhowal

Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba3ZnIr2O9

Abhishek Nag, Srimanta Middey, Sayantika Bhowal, Swarup Panda, Roland Mathieu, J. C. Orain, F. Bert, P. Mendels, P. Freeman, M. Mansson, H. M. Ronnow, M. Telling, P. K. Biswas, D. Sheptyakov, S. D. Kaushik, Vasudeva Siruguri, Carlo Meneghini, D. D. Sarma, Indra Dasgupta, Sugata Ray Email: sspid@iacs.res.in (theoretical), mssr@iacs.res.in (experimental) Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India Centre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India 3 Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India Department of Engineering Sciences, Uppsala University, P.O. Box 534, SE-751 21 Uppsala, Sweden Laboratoire de Physique des Solides, UMR CNRS 8502, Universit Paris-Sud, 91405 Orsay, France Laboratory for Quantum Magnetism (LQM), École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland Jeremiah Horrocks Institute for Mathematics, Physics & Astrophysics, University of Central Lancashire, Preston PR1 2HE, United Kingdom ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX110QX, United Kingdom Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland UGC-DAE-Consortium for Scientific Research Mumbai Centre, R5 Shed, Bhabha Atomic Research Centre, Mumbai 400085, India Dipartimento di Scienze, Universitá Roma Tre, Via della Vasca Navale, 84 I-00146 Roma, Italy Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India

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

We report magnetic susceptibility (chi) 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 (theta_CW) of about -22 K from the chi(T) data. The magnetic heat capacity (Cm) data show a broad maximum at T^max ~ 1.15 K (i.e. T^max/theta_CW ~ 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 T^max 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 (T^{\alpha}) behavior with an exponent {\alpha} 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.

Effect of spin orbit coupling and Hubbard U on the electronic structure of IrO2

We have studied in detail the electronic structure of IrO2 including spin orbit coupling (SOC) and electronelectron interaction, both within the generalized gradient approximation plus Hubbard U (G ...

Exchange-striction induced giant ferroelectric polarization in copper-based multiferroic materialα−Cu2V2O7

We report

Spin wave excitations in the pyrovanadate α − Cu 2 V 2 O 7

\alpha

Breakdown of J = 0 nonmagnetic state in d 4 iridate double perovskites: A first-principles study

-Cu

Covalency and spin-orbit coupling driven magnetism in the double-perovskite iridates Sr2MIrO6 ( M=Ca , Mg)

_2

A comparative study of electronic, structural, and magnetic properties ofα-,β-, andγ−Cu2V2O7

V

Origin of magnetic moments and presence of spin-orbit singlets in Ba2YIrO6

_2

Ba3MIr2O9 hexagonal perovskites in the light of spin-orbit coupling and local structural distortions

O