1. Tanmoy Chakrabarty
Post-doctoral fellow
TIFR, Mumbai
400005 email: imtan90@gmail.com,
Academic Details
 Visiting post-doctorate fellow in TIFR, Mumbai
 M.Sc. Ph.D dual degree in Physics
Department of Physics, IIT Bombay, Powai, Mumbai, India (M.Sc.-2008, CPI- 7.21/10)
 B.Sc. in Physics (Hons) (2006, 56%)
R. K. Mission Vidyamandira, Belur Math, Howrah, WB, India
University: Calcutta University, Kolkata, India
 Higher Secondary (10+2) in Pure Science (2003, 84.2%)
Nabagram Vidyapith, Nabagram, Hooghly, west Bengal, India
Board: West Bengal Council of Higher Secondary Education, Kolkata
 Secondary Exam (2001, 90.13%)
Nabagram Vidyapith, Nabagram, Hooghly, west Bengal, India
Board: West Bengal Board of Secondary Education, Kolkata
Research Experience
 Research Scholar: Dept. of Physics, IIT Bombay, Mumbai, India (June 2008- Aug 2014) and
Teaching Assistant in the x-ray lab IIT Bombay
Supervisor: Prof. A.V. Mahajan, Dept. of Physics, IIT Bombay, Mumbai, India
 Post-doc fellow in TIFR: Department of Condensed matter Physics and material science, TIFR,
Mumbai, India (From May 2015 to present)
Host Professor: P L Paulose, Department of Condensed matter Physics and material science,
TIFR
Current Research Interest
Novel magnetic properties in low-dimensional geometrically frustrated S = 1/2 3d-based oxides: In
the last few decades special emphasis has been laid on low-dimensional spin systems such as chains, square
lattices, ladders, especially since they are intimately connected to the high-temperature cuprate
superconductors. In these low-dimensional systems quantum effects are more dominant for s=1/2 systems
because of their low value of spins. In the antiferromagnetic systems the scenario becomes even more
interesting since the non-fulfillment of simultaneous minimization of energy leads to many low lying
excited states. I have been working on new materials in these domains and studying their bulk and local
properties.
I prepare strongly correlated magnetic systems (mostly oxides) by standard solid state reaction method
using several furnaces and vacuum stations according to the requirements (especially for intermediate
valence state of oxide samples). Then I do the crystallographic studies of the prepared samples by the
PAnalytical X-ray Diffractometer which also has a provision to attach a low-temperature setup down to 4
K. Then I study the bulk properties of these systems using PPMS (Physical properties measurement
system-magnetization, heat capacity and resistivity) and SVSM (Squid-VSM). After that, the local
properties are studied by our solid state NMR setup consisting a 400MHz superconducting magnet

2. (VARIAN), a TECMAG/REDSTONE spectrometer and OXFORD cryostat with accessories. This was
installed in 2009. I was involved in the installation process and working with the system since then.
Here I give a brief description of the systems I worked. First, I mention the work I have done in my PhD.
I have worked in the 6,7
Li NMR measurements of La2Li0.5Cu0.5O4 which shows variation from Zhang-Rice
behavior with our Russian collaborators (A. A. Gippius et al.). This report is published in Phys. Rev. B 86,
241107 (2012) (Rapid Comm.)
On the quest of a novel low-dimensional magnetic system I worked on BaV3O8 where magnetic vanadium
ions (V4+
, S=1/2) are coupled with each other via the non-magnetic (V5+
, S=0) ones. From the bulk
measurements we find both short-range and long-range magnetic ordering in this system. Due to fast
relaxation we could not detect the magnetic vanadium but its presence was confirmed through the window
of the relaxation of the non-magnetic vanadium ions. The spin-spin relaxation confirms that there is a co-
existence of long-range ordered (LRO) and non-LRO regions below the long-range ordering temperature.
This work has been published in Phys Rev. B 88, 014433 (2013)
Another vanadium-based system we studied is Li2ZnV3O8, which is a Zn-doped LiV2O4 system with all the
vanadium ions are in S=1/2 magnetic state. The bulk measurements show no magnetic LRO but a spin-
glass like transition is observed (ZFC-FC split). We confirmed from our NMR measurements that unlike
other doped LiV2O4 systems, lithium is weakly couples with vanadium ions although there is a presence of
glassy anomaly like pristine LiV2O4 and other doped LiV2O4 systems. This work has been published in J.
Phys: Cond. Mat. 26, 265601 (2014)
Third vanadium-based compound which I have done in my PhD is Zn3V3O8, which shows cluster spin-
glass behavior and we have studied its spin-glass characteristics and to explore more we carried out further
experiments and observed magnetic relaxation, memory and aging phenomena which are thought to be
typical characteristics of spin glass dynamics. This work is published in J. Phys: Cond. Mat. 26, 405601
(2014)
From 2015 onwards, I have joined in TIFR Mumbai as a post-doctoral visiting fellow and was involved in
successfully building a solid-state NMR setup with my host Prof. P L Paulose. After that, we have carried
out a comparative bulk and NMR study of two ruthanate compounds, Ca3LiRuO6 and Ca3NaRuO6, with
similar A3ATO6-type (A = Ca, Sr; A′ = Li, Na, TM; T = TM) of structure, with the NMR probe we built.
Out of these two compounds, Ca3LiRuO6 is a weak ferromagnet with a magnetic ordering temperature of
115 K. The 7
Li NMR linewidth of Ca3LiRuO6 displays a broad shoulder above the magnetic ordering
temperature. Anomalous shoulder of this type is observed in the magnetic susceptibility data also. The
origin of these phenomena is not clear but could possibly be attributed to low dimensional magnetism. A
contrasting magnetic behavior is seen in Ca3NaRuO6, an antiferromagnet with a transition temperature at
87 K. The heat capacity of both compounds show a λ-type anomaly at respective magnetic transition
temperatures. However, in both the systems the entropy change (ΔS) is much less than that of an ordered S
= 3/2 system. The NMR study shows that the Knight shift is proportional to the magnetic susceptibility.
Also, in Ca3NaRuO6, the Knight shift and the linewidth of the spectra change differently compared to
Ca3LiRuO6.
This work is very recently accepted in Journal of physics: Condensed matter
We have also carried out bulk and NMR studies on three more strongly correlated low-dimensional spin
systems here in TIFR, the manuscript of these are under preparation now.
Publications
Accepted/published/under review in journals
1. Magnetic Studies on a New S = 1/2 Vanadium Based (V4+
) Geometrically Frustrated System
(BaV3O8): Tanmoy Chakrabarty and A.V. Mahajan, AIP Conf. Proc. 1349, 1199 (2011)

3. 2. Direct evidence of non-Zhang-Rice Cu3+
centers in La2Li0.5Cu0.5O4: A. S. Moskvin, A. A. Gippius,
A. V. Tkachev, A.V. Mahajan, T. Chakrabarty, I. A. Presniakov, A. V. Sobolev and G.
Demazeau, Phys. Rev. B 86, 241107 (2012) (Rapid Comm.)
3. BaV3O8: A possible Majumdar-Ghosh system with S=1/2 , T. Chakarabarty: A.V. Mahajan, A.
Gippius, A. V. Tkachev, N.Buettgen, W. Kraetschmer, Phys. Rev. B 88, 014433 (2013)
4. Li2ZnV3O8: a vanadium-based geometrically frustrated spinel system, T Chakrabarty, A V
Mahajan and B Koteswararao, J. Phys.: Condens. Matter 26, 265601(2014)
5. Cluster spin glass behavior in geometrically frustrated Zn3V3O8: T. Chakrabarty, A. V. Mahajan
and S. Kundu, J. Phys.: Condens. Matter 26, 405601(2014)
6. Comparative NMR studies on Ca3LiRuO6 and Ca3NaRuO6, T Chakrabarty and P L Paulose
(Accepted in J. Phys.: Condens. Matter, 2016)
Presentations
Conference, School Workshop and Academic visits
1. Attended Indian Condensed Matter Workshop held in Mahabaleshwar during Dec 9-22, 2008
2. Presented poster at the Indo-US Workshop on Advanced Magnetic Materials and their application,
1-4th
March 2009 held at Mumbai, India.
3. Attended Workshop on Cryogenics and Physics at Low Temperature, on 9th
July 2009, held at
TIFR, Mumbai, India.
4. Presented poster at the International Conference on Magnetism, Superconductivity and Phase
Transition in Novel and Complex Materials (MSM-2009), 11-14th
November, 2009, held at
Kolkata, India.
5. Contributed talk on ‘Study of a low-dimensional geometrically frustrated magnetic systems’ at
SYMPHY 2013, IIT Bombay (4th
April 2013)
6. Attended and presented poster in the Lowtherm final workshop ("quantum magnets 2013"
Advances in quantum magnets – dynamics), Kolymbari, Crete, Greece
7. Attended and given an oral presentation in JCNS (Jülich Centre for Neutron Science) workshop
focusing on Trends and Perspectives in Neutron Scattering: Magnetism and Correlated Electron
Systems from 7-10th
October, 2013 at Tutzing, Germany
8. 32nd
Young Physicists Colloquium, 21-22 August, 2014, Kolkata, West Bengal, India
9. Presented Poster in the Workshop on current trends in frustrated magnetism 9-13 February,
2015 organized by International Centre for Theoretical Physics (ICTP) in JNU, New Delhi
10. Visited Max Planck -Institute for Chemical Physics of Solids in Dresden, Germany for 2 weeks in
2015 and given an oral presentation
11. Visited University of Pavia, Italy in 2015 and given an oral presentation
12. Visited ETH Zurich, Switzerland in 2015 and given an oral presentation
Teaching Experience
 Guided four M.Sc. (Mr. Kousik Sen, Mr. Tathamay Basu, Mr. Debashish and Mr. Rajesh) students
of Dept. of Physics, IIT Bombay for their respective Master’s thesis project.
 Teaching Assistant in General Physics Laboratory for 1st
year B.Tech. students at Dept. of
Physics, IIT Bombay.
 Teaching Assistant in General Physics Laboratory for 1st
year M.Sc. students at Dept. of Physics,
IIT Bombay.
 Teaching Assistant in Solid State Physics laboratory for 3rd
year B.Tech. students and 2nd
year
M.Sc. students at Dept. of Physics, IIT Bombay.
Demonstration in scientific exhibitions
Demonstrated “superconductivity and magnetic levitation” in ‘IIT Bombay Techfest” ( 2011-2013)
Techfest Homepage: http://www.techfest.org/

4. Awards and Achievements
 Secured 78th
all India rank in JAM-2006 (conducted by all IITs) among more than 4000 students.
 Secured 2183th
rank among more than 100,000 students appeared in WBJEE-2002 conducted by
WBUT, Kolkata, India.
 Stood 44th
in 10th
level board exam.
 Recipient of National Scholarship based on performance in 10th
and 10+2 level board exam.
Research Skills:
 Theoretical and operational knowledge and more than five years of experience in solid state NMR
techniques since 2010.
 Regular user of PPMS (Physical properties measurement system-magnetization, heat capacity and
resistivity), SVSM (Squid-VSM) from 2008
 Operator PAnalytical X-ray Diffractometer from 2009-2011
 Operational knowledge in vacuum techniques ( Turbo pump, Diffusion pump, rotary pump)
 Prepared around 15 compounds to study their physical properties in standard solid state reaction
method and expertise in preparing vanadium-based systems.
References
Prof. A. V. Mahajan (PhD guide)
Professor,
Department of Physics, Ph No: +91-22-25767573
Indian Institute of Technology Bombay, Fax: +91-22-25723480
Powai, Mumbai - 400076, India email: mahajan@phy.iitb.ac.in
Homepage: http://www.phy.iitb.ac.in/doku/doku.php/faculty/mahajan/home
Prof. A. A. Gippius (Collaborator)
Professor
Faculty of Physics,
Lomonosov Moscow State University,
Moscow 119991, Russia email: gippius@mail.ru
Prof. K. G. Suresh (PhD research progress committee member)
Professor,
Department of Physics, Ph No: +91-22-25767559
Indian Institute of Technology Bombay, Fax: +91-22-25723480
Powai, Mumbai - 400076, India email: suresh@phy.iitb.ac.in
Homepage: http://www.phy.iitb.ac.in/doku/doku.php/faculty/suresh/home
Prof. P.L. Paulose (Host Professor in TIFR)
Professor,
Condensed Matter Physics and Materials Science
Office : A-171
Office Phone : 22782412
Lab : CG-28
Lab Phone : 22782434
Email : paulose@tifr.res.in