Indian Association for the Cultivation of Science

Name : Sugata Ray

Department : School of Materials Sciences
Designation : Senior Professor
Contact : +91 33 2473 4971 (Ext:1226)
Email : mssr@iacs.res.in


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Research Summary :

• Study of strongly correlated systems comprising of 3d, 4d and 5d transition metal oxides. 
 
• Developing new materials with novel magnetic, multiferroic and electronic properties.
 
• Study of quantum materials with special emphasis on spin-orbit coupling.
 
• Utilization of nanotechnology to address selective/collective decontamination of water.

 

Selected Recent Publications :

  1. Abhisek Bandyopadhyay et al., Phys. Rev. B 105, 104431 (2022).
  2. Md. Salman Khan et al., Phys. Rev. B 105, 085137 (2022).
  3. Md. Salman Khan et al., Phys. Rev. B 104, 214414 (2021).
  4. Rafikul Ali Saha et al., Phys. Rev. B: Rapid Comm. 101, 180406(R) (2020).
  5. Samirul Islam et al., Environmental Science Water research and technology 6, 2057 (2020).
  6. Abhishek Nag et al., Phys. Rev. Lett. 123, 017201 (2019).
  7. Payel Aich et al., J. Mater. Chem. C 7, 3560 (2019).
  8. Abhisek Bandyopadhyay et al., Phys. Rev. B 100, 064416 (2019).
  9. Md. Salman Khan et al., Phys. Rev. B 100, 064423 (2019).
  10. Abhishek Nag et al., Phys. Rev. B 98, 014431 (2018).
  11. Abhishek Nag et al., Phys. Rev. B 97, 064408 (2018).
  12. Arindam Malakar et al., Scientific Reports 6, 26031 (2016).
  13. Abhishek Nag et al., Phys. Rev. Lett. 116, 097205 (2016).

 



Academic Profile

M. Sc. : University of Calcutta, 1997

Ph. D. : Indian Institute of Science, Bangalore, 2004

Post Doctoral Research Associate : Tokyo Institute of Technology, Japan, 2006

Visiting Faculty : Department of Materials Science, IACS, Kolkata, 2006−2007

Assistant Professor : Department of Materials Science, IACS, Kolkata, 2007-2012

Associate Professor : Department of Materials Science, IACS, Kolkata, 2012-2016

Professor : Department of Materials Science, IACS, Kolkata, since January 2016-2021

Senior Professor : School of Materials Science, IACS, Kolkata, since January 2021- 


Group

Debu Das

PhD Student
M.Sc. Physics (Ramakrishna Mission Vivekananda Educational and Research Institute) JRF smsdd2531@iacs.res.in
+91 33 2473 4971 (Ext 1213)
Biplab Pakhuria

PhD Student
M. Sc. Physics, (Indian Association for the Cultivation of Science)
JRF
intbp@iacs.res.in
+91 33 2473 4971 (Ext 1213)
Samirul Islam

PhD Student
M.Sc. Chemistry (IIT Delhi)
SRF
mssi@iacs.res.in
(+91)-33-2473 4971 (Extn. 1213)
Sanjit Das

PhD Student
M.Sc. Chemistry (Vidyasagar University)
SRF
mssd5@iacs.res.in
(+91)-33-2473 4971 (Extn. 1213)
Shuvajit Halder

PhD Student
M.Sc. Physics (Calcutta University)
SRF
mssh@iacs.res.in
(+91)-33-2473 4971 (Extn. 1213)
Siddhartha Sankar Soren

PhD Student
M.Sc. Physics (Indian Association for the Cultivation of Science)
JRF
mssss2407@iacs.res.in
+91 33 2473 4971 (Ext 1213)

 


Publication

Publications

 

 

Publications

 

2024

     

  • Probing the Magnetic Ground State of Ba2YIrO6: Impact of Nonmagnetic Dopants and Spin-Orbit Coupling

Shuvajit Halder et al.; Materials 17, 1766 (2024). 

  • Structural rearrangement followed by entrapment of subnanometer building blocks of iron oxyhydroxide in aqueous iron chloride solutions

Sanjit Das et al.; accepted for publication in Inorganic Chemistry. 

 

2023

     

  • Leaching Performance of Nanotechnology-Induced High-Arsenic-Bearing Tooeleite-like Mineral Nanowaste

Arindam Malakar et al.; Environments 10, 185 (2023). 

 

  • Curious Behavior of Fe3+-As3+ Chemical Interactions and Nucleation of Clusters in Aqueous Medium

Sanjit Das et al.; Inorganic Chemistry 62, 11966 (2023). 

 

  • Short-range magnetic correlation, metamagnetism, and coincident dielectric anomaly in Na5Co15.5Te6O36
Rafikul Ali Saha et al.; Phys. Rev. B 107, 155105 (2023).

 

  • Fluorination Induced Asymmetry in Vacancy Ordered Brownmillerite: A Route to Multiferroic Behavior
Payel Aich et al.; Chemistry of Materials 35, 991 (2023).

 

 

2022

 

  • Preferred orientation in polycrystalline colossal electroresistive hollandite PbFexV6-xO11
Shivajit Halder and Sugata Ray; International Journal of Ceramic Engineering and Science, 1-6 (2022).
 
  • Breakdown of atomic spin-orbit coupling picture in an apparently isolated pseudo-one-dimensional iridate: Sr3NaIrO6
Abhisek Bandyopadhyay et al.; Phys. Rev. B 105, 104431 (2022).
 
  • Mixed-valent metallic pyrochlore iridate: A possible route to non-Fermi liquids
Md. Salman Khan et al.; Phys. Rev. B 105, 085137 (2022).

 

2021

  • Phase inhomogeneity and inapplicability of Jeff=0 description in dilute Ir5+ doped Ba2YSb1−xIrxO6 (x = 0.1, 0.2, 0.3)
Md. Salman Khan et al.; Phys. Rev. B 104, 214414 (2021).
 
  • A Colossal Electroresistance response, accompanied by metal-insulator transition, in a mixed-valent vanadate
Rafikul Ali Saha et al.; Phys. Rev. B 104, 045149 (2021).
 
  • The critical role of stereochemically active lone pair in introducing high temperature ferroelectricity
Rafikul Ali Saha et al.; Inorganic Chemistry 60, 4068 (2021).

 

2020

  • Magnetic polarons and spin-glass behavior in insulating La1-xSrxCoO3 (x=0.125 and 0.15)
P. Anil Kumar et al.; Physical Review Research 2, 043344 (2020).
 
  • Coagulating and flocculating Ferrihydrite: Application of Zinc Acetate salt
Samirul Islam, Sanjit Das, Geetanjali Mishra, Bidisa Das, Arindam Malakar, Ilaria Carlomagno, Carlo Meneghini, Giovanni De Giudici, Liliana P. L. Gonçalves, Juliana P. S. Sousa, Yury V. Kolen’ko, Andrei Cristian Kuncser, and Sugata Ray; Enviromental Science: Water Research and Technology 6, 2057 (2020).

 

  • Covalency drieven modulation of paramagnetism and development of lone pair ferroelectricity in multiferroic Pb3TeMn3P2O14

Rafikul Ali Saha, Anita Halder, Tanusri Saha-Dasgupta, Desheng Gu, Mitsuru Itoh and Sugata Ray; Phys. Rev. B: Rapid Comm. 101, 180406(R) (2020).

 

  • Deviation from nonmagnetic J=0 state in a pentavelent columnar iridate Sr3NaIrO

Abhisek Bandyopadhyay and Sugata Ray; Bulletin of American Physical Society  (2020).

 

  • Retrospecting the nature of ordering in CaMnO2 : The role of Mn-O covalency in the local structure

Payel Aich, Shreya Das, Carlo Meneghini, Irene Schiesaro, Tanusri Saha-Dasgupta, and Sugata Ray; Physica B 581, 411837 (2020)..

 

2019:

 

  • Evolution of electronic and magnetic properties in a series of iridate double perovskites Pr2-xSrxMgIrO6 (= 0, 0.5, 1.0)

Abhisek Bandyopadhyay, Ilaria Carlomagno, Laura Simonelli, Carlo Meneghini, and Sugata Ray; Phys. Rev. B 100, 064416 (2019).

 

  • Magnetic ground state of distorted 6perovskite Ba3CdIr2O9

Md. Salman Khan, Abhishek Bandyopadhyay, Abhishek Nag, Vinod Kumar, A. V. Mahajan, and Sugata Ray, Phys. Rev. B 100, 064423 (2019).

 

  • Revisiting Goodenough-Kanamori rules in a new series of double perovskites LaSr1-xCaxNiReO6

Somnath Jana, Payel Aich, P. Anil Kumar, O. K. Forslund, E. Nocerino, V. Pomjakushin, M. Månsson, Y. Sassa, Peter Svedlindh, Olof Karis, and Sugata Ray; Scientific Reports 9, 18296 (2019).

 

  • Hopping induced magnetism in the ground state of 6H perovskite iridates

A. Nag, S. Bhowal, M. Moretti Sala, A. Effimenko, I. Dasgupta, and Sugata Ray; Phys. Rev. Lett. 123, 017201 (2019).

 

  • Identifying the nature of dielectric anomalies in SrFeO3-d

Payel Aich, Desheng Fu, Carlo Meneghini, and Sugata Ray; J. Magn. Magn. Materials 486, 165265 (2019).

 

  • Fluorinated Hexagonal 4SrMnO3 : A locally disordered manganite

Payel Aich, Carlo Meneghini, Luca Tortora, Vasudeva Siruguri, S. D. Kaushik, and Sugata Ray; J. Mater. Chem. C 7, 3560 (2019).

 

  • Evolution of magnetic properties in F-doped brownmillerite Ca2Fe2O5

Payel Aich, Carlo Meneghini, and Sugata Ray; Materials Research Express 6, 026103 (2019).

 

2018:

  • Effect of Ni doping on the magnetic and electronic properties of half heusler Cu1-xNixMnSb alloys

A. Bandyopadhyay, S.K. Neogi, A. Paul, C. Meneghini, I. Dasgupta, and Sugata Ray; J. Alloys and Compounds 764, 656 (2018).

 

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

Abhishek Nag, Sayantika Bhowal, Atasi Chakraborty, M. M. Sala, A. Effimenko, F. Bert, P. K. Biswas, A. D. Hillier, M. Itoh, S. D. Kaushik, V. Siruguri, C. Meneghini, I. Dasgupta, and Sugata Ray; Phys. Rev. B 98, 014431 (2018).

 

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

Abhishek Nag, Sayantika Bhowal, F. Bert, A. D. Hillier, M. Itoh, Ilaria Carlomagno, C. Meneghini, T. Sarkar, R. Mathieu, I. Dasgupta, and Sugata Ray; Phys. Rev. B 97, 064408 (2018).

 

  • Development of half metallicity within mixed magnetic phase of Cu1-xCoxMnSb alloy

Abhisek Bandyopadhyay, Swarup Kumar Neogi, Atanu Paul, Carlo Meneghini, Sudipta Bandyopadhyay, Indra Dasgupta, and Sugata Ray; J. Phys.: Condens. Matter 30, 205802 (2018).

 

2017:

  • Misjudging frustrations in spin liquids from oversimplified use of Curie-Weiss law

 

A. Nag and Sugata Ray; J. Magn. Magn. Mater. 424, 93 (2017).     

 

  • Influence of synthesis conditions on tunnelling magnetoresistance mechanisms in Sr2FeMoO6

            Abhishek Nag, Somnath Jana, Srimanta Middey and Sugata Ray; Indian Journal of Physics (invited review), DOI: 10.1007/s12648-017-0986-2 (2017).

 

2016:

  • Cationic order versus La-O covalency in LaA(Ca,Ba)VMoO6 double perovskites

A. Bandyopadhyay, S. K. Neogi et al.; Phys. Rev. B 95, 024432 (2016).

 

  • Metal-insulator transition in Ba3Fe1-xRu2+xO9: an interplay between site-disorder, chemical percolation, and electronic structure

S. Middey, Payel Aich et al.; Phys. Rev. B 94, 184424 (2016). 

 

  • Rapid decadal evolution in the Groundwater Arsenic content of Kolkata, India and its correlation with the practices of her dwellers

Arindam Malakar, Samirul Islam, Md. Ashif Ali, and Sugata Ray; Environmental Monitoring and Assessment 188, 584 (2016).

 

  • Efficient artificial mineralization route to decontaminate Arsenic(III) polluted water - the Tooeleite Way

A. Malakar et al.; Scientific Reports 6, 26031 (2016).

 

  • Origin of spin-orbital liquid state in a nearly J=0 iridate Ba3ZnIr2O9

A. Nag et al.; Phys. Rev. Lett. 116, 097205 (2016).

 

  • Signature of covalency and disorder on the dielectric and magnetic properties of Ba6Co6ClO16

T. Chakraborty et al.; J. Electron. Spectrosc. Relat. Phenom. 207, 19 (2016).

 

  • Method for instantaneous 2-line ferrihydrite synthesis in-situ using layered hydroxides and its consequent use in removing arsenic and other contaminants from groundwater  and industrial waste water

            Sugata Ray et al.; Patent application number 201631036642 (E-11/1/2017/KOL).

 

2015:

  • Neutron powder diffraction study of Ba3ZnRu2-xIrxO9 (x = 0, 1, 2) with 6H-type perovskite structure

P. Beran et al.; Solid State Sciences 50, 58 (2015).

 

  • Formation of two-dimensional ordered nanodomains and curious properties of Sr3FeMoO7

T. Chakraborty et al.; J. Mater. Chem. C 3, 8127 (2015).

 

  • Magnetoresistance stories of double perovskites

A. Nag et al.; Pramana 84, 967 (2015).

 

  • New method of permanent removal of Arsenic(III) from contaminated water

Sugata Ray et al.; Patent Application No. 822/KOL/2015.

 

2014:

  • Covalency-driven structural instability and spin-phonon coupling in barium cobalt oxychloride

T. Chakraborty et al.; Phys. Rev. B 90, 235147 (2014).

 

  • ZnS nanorod as an efficient heavy metal ion extractor from water

A. Malakar et al.; J. Water Process Engn. 3, 74 (2014).

 

  • Evolution of diffuse microscopic phases and magnetism in Ca, Fe co-doped BaTiO3

T. Chakraborty et al.; J. Alloys and Comp. 610, 271 (2014).

 

  • Investigating the development of spurious magnetism in single crystalline BaTi0.95Fe0.05O3-δ with high δ by local structural probes

T. Chakraborty et al.; J. Phys.: Condens. Matter 26, 196001 (2014).

 

  • Re-entrant superspin glass phase in La0.82Ca0.18MnO3 ferromagnetic insulator

P. Anil Kumar et al.; Phys. Rev. X 4, 011037 (2014).

 

  • Magnetoresistance and electroresistance effects in Fe3O4 nanoparticle system

P. Anil Kumar et al.; Journal of Experimental Nanoscience 9, 391 (2014).

 

2013:

  • Engineered spin-valve type magnetoresistance in Fe3O4-CoFe2O4 coreshell nanoparticles

P. Anil Kumar et al.; Appl. Phys. Lett. 103, 102406 (2013).

 

  • Structural, electrical, and magnetic properties of Ba0.9Ca0.1Ti0.97Fe0.03O3 and the effect of oxygen vacancies

T. Chakraborty et al.; J. Appl. Phys. 114, 223911 (2013).

 

  • Photoelectron spectromicroscopy study of metal-insulator transition in NaxWO3

S. Paul et al.; Solid State Communications 166, 66 (2013).

 

  • Magnetic and nonmagnetic tunnel barriers in Sr2FeMoO6

A. Nag et al.; IOP Conf. Series: Materials Science and Engineering 46, 012001 (2013).

 

  • Microscopic distribution of metal dopants and anion vacancies in Fe-doped BaTiO3-δ single crystals

T. Chakraborty et al.; J. Phys.: Condens. Matter 25, 236002 (2013).

 

2012:

  • Giant texturing effect in multiferroic MnWO4 polycrystals

S. Jana et al.; J. Phys D.: Appl. Phys 45, 425301 (2012).

 

  • Signature of an antiferromagnetic metallic ground state in heavily electron doped Sr2FeMoO6

S. Jana et al.; Phys. Rev. B 86, 054433 (2012).

 

  • Evidence of oxygen-vacancy-induced ferromagnetic order in single crystal Mn-doped SrTiO3

S. Middey et al.; Appl. Phys. Lett. 101, 042406 (2012).

 

  • LaSrVMoO6: A case study for A-site covalency-driven local cationic order in double Perovskites

S. Jana et al.; Phys. Rev. B 86, 014203 (2012).

 

  • Defect controlled room temperature ferromagnetism in Co-doped barium titanate Nanocrystals

S. Ray et al.; Nanotechnology 23, 025702 (2012).

 

2011:

  • Origin of the unconventional magnetoresistance in Sr2FeMoO6

S. Ray et al.; Europhysics Letters 94, 47007 (2011).

 

  • Glass-like ordering and spatial inhomogeneity of magnetic structure in Ba3FeRu2O9: The role of Fe/Ru-site disorder

S. Middey et al.; Phys. Rev. B 83, 144419 (2011).

 

  • Defect induced magnetism: an affirming test of dilute magnetism in Fe-doped hexagonal BaTiO3 single crystals

T. Chakraborty et al.; Phys. Rev. B 83, 144407 (2011).

 

 

  • Fluorination Induced Asymmetry in Vacancy Ordered Brownmillerite: A Route to Multiferroic Behavior
Payel Aich et al.; Chemistry of Materials 35, 991 (2023).


Teaching

CH-521: Chemistry and Physics of Materials (2007, 2012),
CH-525: Advanced Materials Science (2012-2016, 2019).
CH-425: Elementary Polymer and Solid State Chemistry (2017).
MS4204: Symmetry, Structure, and Diffraction (2020, 2021)
 
PhD Course:
 
Advanced Solid State Physics (2008, 2010, 2015).
Electronic, Optical, and Magnetic properties of Solids (2018).


Facilities

 


Open Positions

Interested students from Physics/Chemistry background can contact us for PhD


Patent

1. New method of permanent removal of Arsenic(III) from contaminated water
Sugata Ray, Arindam Malakar, Bidisa Das, Samirul Islam, and Somobrata Acharya;
Indian Patent No. 316110, filed on 28/07/2015 and granted on 16/07/2019.
 
 
2. Method for instantaneous 2-line ferrihydrite synthesis in-situ using layered hydroxides
and its consequent use in removing arsenic and other contaminants from groundwater
and industrial waste water
Sugata Ray, Samirul Islam, and Arindam Malakar; Indian Patent No. 315405, filed
on 26/10/2016 and granted on 02/07/2019.


Contact Us

                                                                                                                         

School of Materials Science
Indian Association for the Cultivation of Science
Phone: +91 33 2473 4971 (ext 1226),
Fax:  +91 33 2473 2805

mssr@iacs.res.in

Thank You


Alumni

Srimanta Middey

Assistant Professor
Department of Physics, Indian Institute of Science, Bengaluru.
Anil Kumar Puri


Works at Seagate Technogy, Ireland
Somnath Jana


Helmholtz Zentrum Berlin (FG-ISRR), Berlin Germany
Tanushree Chakraborty


Lecturer at IEM.
Swarup K. Neogi


Assistant Professor, Adamas University.
Arindam Malakar


Research Assistant Professor, University of Nebraska-Lincoln.
Abhishek Nag

Post doctoral researcher
Laboratory for Non-linear Optics, PSI, Switzerland
Geetanjali Mishra

Post doctoral researcher
Indian Institute of Technology Bombay, India
Abhisek Bandyopadhyay

Post doctoral researcher
Science and Technology Facilities Council, United Kingdom
Payel Aich


Postdoctoral Researcher, University of Roma Tre, Italy
Rafikul Ali Saha

Post doctoral researcher
KU Leuven, Leuven-3001, Belgium
MD Salman Khan

Post doctoral researcher
Sungkyunkwan University, South Korea

 



Research Activities