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Dr Monica Ciomaga Hatnean

Background

I completed a Ph.D. in Chemistry at Paris-Sud University, Orsay, France in 2012, under the joint supervision of Loreynne Pinsard-Gaudart and Sylvain Petit. I worked on the "Synthesis and study of the Ga2-xFexO3 compounds" at LPCES-ICMMO, Orsay and LLB, CEA-Saclay.

I joined the Superconductivity and Magnetism Group as a Post Doctoral Research Fellow in January 2013. I am working jointly with Geetha Balakrishnan (my supervisor), Don Paul, Martin R. Lees and Oleg A. Petrenko.

Research Interests

My current project involves the crystal growth and study of single crystals of oxides, borides and intermetallic magnetic and superconducting compounds. The materials that I am studying range from oxides/intermetallics, to a variety of newly discovered exotic materials (Topological Insulators, Skyrmion lattices, Quasicrystals).

The investigation of the physics of all the materials that I produce at Warwick requires a range of techniques, including in house magnetic, transport measurements as well as the use of central facilities using neutron scattering and muon techniques.


Publications

2017

1. N. Martin, P. Bonville, E. Lhotel, S. Guitteny, A. Wildes, C. Decorse, M. Ciomaga Hatnean, G. Balakrishnan, I. Mirebeau, S. Petit, "Disorder and Quatum spin ice", Physical Review X 7, 041028 (2017). (link)

2. Mate Hartstein, William Toews, Yu -Te Hsu, Bin Zeng, Xiaoye Chen, Monica Ciomaga Hatnean, Qiu Run Zhang, Shota Nakamura, Andrew Padgett, Gilles Rodway-Gant, Joel Berk, Matthew Kingston, Grace Zhang, Mun Chan, Satoshi Yamashita, Toshiro Sakakibara, Yasumasa Takano, Ju-Hyun Park, Luis Balicas, Neil Harrison, Natalya Shitsevalova, Geetha Balakrishnan, Gilbert Lonzarich, Robert Hill, Michael L Sutherland, Suchitra Sebastian, "Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB6", Nature Physics (2017). (link)

3. Romain Sibille, Elsa Lhotel, Monica Ciomaga Hatnean, Gøran Nilsen, Georg Ehlers, Antonio Cervellino, Eric Ressouche, Matthias Frontzek, Oksana Zaharko, Vladimir Pomjakushin, Helen C. Walker, Devashibhai Adroja, Hubertus Luetkens, Chris Baines, Alex Amato, Geetha Balakrishnan, Tom Fennell, and Michel Kenzelmann, "Coulomb spin liquid in anion-disordered pyrochlore Tb2Hf2O7", Nature Communications 8, 892 (2017). (link)

4. Romain Sibille, Nicolas Gauthier, Han Yan, Monica Ciomaga Hatnean, Jacques Ollivier, Barry Winn, Geetha Balakrishnan, Michel Kenzelmann, Nic Shannon, Tom Fennell, "Experimental signatures of emergent quantum electrodynamics in a quantum spin ice", under review. (link)

5. J. C. Loudon, A. O. Leonov, A. N. Bogdanov, M. Ciomaga Hatnean, G. Balakrishnan, "Direct observation of attractive skyrmions and skyrmion clusters in a cubic helimagnet Cu2OSeO3", under review. (link)

6. Sourabh Barua, M. Ciomaga Hatnean, M. R. Lees, G. Balakrishnan, "Signatures of the Kondo effect in VSe2", Scientific Reports 7, 10964 (2017). (link)

7. Sangram Biswas, M. Ciomaga Hatnean, G. Balakrishnan, Aveek Bid, "Probing the interplay between surface and bulk states in the topological Kondo insulator SmB6 through conductance fluctuation spectroscopy", Physical Review B 95, 205403 (2017). (link)

8. P. K. Biswas, M. Legner, G. Balakrishnan, M. Ciomaga Hatnean, M. R. Lees, D. McK. Paul, E. Pomjakushina, T. Prokscha, A. Suter, T. Neupert, and Z. Salman, "Suppression of magnetic excitations near the surface of the topological Kondo insulator SmB6", Physical Review B 95, 020410(R) (2017). (link)

9. Monica Ciomaga Hatnean, Romain Sibille, Martin R. Lees, Michel Kenzelmann, Voraksmy Ban, Vladimir Pomjakushin, and Geetha Balakrishnan, "Single crystal growth, structure and magnetic properties of Pr2Hf2O7 pyrochlore", Journal of Physics: Condensed Matter 29, 075902 (2017). (link)

2016

10. S. Petit, E. Lhotel, S. Guitteny, O. Florea, J. Robert, P. Bonville, I. Mirebeau, J. Ollivier, H. Mutka, E. Ressouche, C. Decorse, M. Ciomaga Hatnean, and G. Balakrishnan, "Antiferroquadrupolar correlations in the quantum spin ice candidate Pr2Zr2O7", Physical Review B 94, 165153 (2016). (link)

11. P. Bonville, S. Guitteny, A. Gukasov, I. Mirebeau, S. Petit, C. Decorse, M. Ciomaga Hatnean, and G. Balakrishnan, "Magnetic properties and crystal field in Pr2Zr2O7", Physical Review B 94, 134428 (2016). (link)

12. R. Sibille, T. Fennell, M. Ciomaga Hatnean, E. Lhotel, D. Keen, G. Balakrishnan and M. Kenzelmann, "Structural disorder in a magnetic pyrochlore oxide", Acta Crystallographica A A72, s306 (2016). (link)

13. Romain Sibille, Elsa Lhotel, Monica Ciomaga Hatnean, Geetha Balakrishnan, Björn Fåk, Nicolas Gauthier, Ton Fennell, and Michel Kenzelmann, "Quantum spin ice in the pyrochlore Pr2Hf2O7", Physical Review B 94, 024436 (2016). (link)

14. Monica Ciomaga Hatnean, Claudia Decorse, Martin R. Lees, Oleg A. Petrenko, and Geetha Balakrishnan, "Zirconate Pyrochlore Frustrated Magnets: Crystal Growth by the Floating Zone Technique", Crystals 6, 79 (2016). (link)

15. A. Oleaga, A. Salazar, M. Ciomaga Hatnean, and G. Balakrishnan, "Critical behavior study of Pr1−xSrxMnO3 and Nd1−xSrxMnO3 with x = 1/2", Journal of Alloys and Compounds 682, 825 (2016). (link)

16. S. Petit, E. Lhotel, B. Canals, M. Ciomaga Hatnean, J. Ollivier, H. Mutka, E. Ressouche, A. R. Wildes, M. R. Lees and G. Balakrishnan, "Observation of magnetic fragmentation in spin ice", Nature Physics 12, 746 (2016). (link)

2015

17. E. Lhotel, S. Petit, S. Guitteny, O. Florea, M. Ciomaga Hatnean, C. Colin, E. Ressouche, M. R. Lees, and G. Balakrishnan, "Fluctuations and all-in--all-out ordering in dipole-octopole Nd2Zr2O7", Physical Review Letters 115, 197202 (2015). (link)

18. Sangram Biswas, Ramya Nagarajan, Suman Sarkar, Kazi Rafsanjani Amin, M. Ciomaga Hatnean, S. Tewari, G. Balakrishnan, and Aveek Bid, "Robust local and nonlocal transport in the topological Kondo insulator SmB6 in the presence of a high magnetic field", Physical Review B 92, 085103 (2015). (link)

19. A. Oleaga, A. Salazar, M. Ciomaga Hatnean, and G. Balakrishnan, "Three-dimensional Ising critical behavior in R0.6Sr0.4MnO3 (R=Pr,Nd) manganites", Physical Review B 92, 024409 (2015). (link)

20. B. S. Tan, Y.-T. Hsu, B. Zeng, M. Ciomaga Hatnean, N. Harrison, Z. Zhu, M. Hartstein, M. Kiourlappou, A. Srivastava, M. D. Johannes, T. P. Murphy, J.-H. Park, L. Balicas, G. G. Lonzarich, G. Balakrishnan, Suchitra E. Sebastian, "Unconventional Fermi surface in an insulating state", Science 349, 287 (2015). (link)

21. T. Lancaster, R. C. Williams, I. O. Thomas, F. Xiao, F. L. Pratt, S. J. Blundell, J. C. Loudon, T. Hesjedal, S. J. Clark, P. D. Hatton, M. Ciomaga Hatnean, D. S. Keeble, and G. Balakrishnan, "Transverse field muon-spin rotation signature of the skyrmion-lattice phase in Cu2OSeO3", Physical Review B 91, 224408 (2015). (link)

22. M. Ciomaga Hatnean, M. R. Lees, O. A. Petrenko, D. S. Keeble, G. Balakrishnan, M. Gutmann, V. V. Klekovkina and B. Z. Malkin, "Structural and magnetic investigations of single-crystalline neodymium zirconate pyrochlore Nd2Zr2O7", Physical Review B 91, 174416 (2015). (link)

23. M. Ciomaga Hatnean, M. R. Lees, and G. Balakrishnan, "Growth of single-crystals of rare-earth zirconate pyrochlores, Ln2Zr2O7 (with Ln=La, Nd, Sm, and Gd) by the floating zone technique", Journal of Crystal Growth 418, 1 (2015). 
(link)

2014

24. R. Fittipaldi, L. Rocco, M. Ciomaga Hatnean, V. Granata, M. R. Lees, G. Balakrishnan, and A. Vecchione, "Crystal growth and characterization of the non-centrosymmetric antiferromagnet Ba2CuGe2O7", Journal of Crystal Growth 404, 223 (2014). (link)

25. P. K. Biswas, Z. Salman, T. Neupert, E. Morenzoni, E. Pomjakushina, F. von Rohr, K. Conder, G. Balakrishnan, M. Ciomaga Hatnean, M. R. Lees, D. McK Paul, A. Schilling, C. Baines, H. Luetkens, R. Khasanov, and A. Amato, "Low-temperature magnetic fluctuations in the Kondo insulator SmB6", Physical Review B 89, 161107(R) (2014). (link)

26. M. Ciomaga Hatnean, C. Decorse, M. R. Lees, O. A. Petrenko, D. S. Keeble, and G. Balakrishnan, "Structural and magnetic properties of single crystals of the geometrically frustrated zirconium pyrochlore, Pr2Zr2O7", Materials Research Express 1, 026109 (2014).
 (link)

2013

27. M. Ciomaga Hatnean, M. R. Lees, D. McK Paul, and G. Balakrishnan, "Large high quality single crystals of the new Topological Kondo Insulator, SmB6", Scientific Reports 3, 3071 (2013).
 (link)

28. M. Ciomaga Hatnean, L. Pinsard-Gaudart, M. T. Fernandez-Diaz, S. Petit, A. Dixit, G. Lawes, and R. Suryanarayanan, "Structural and magnetic properties of the M2Ga2Fe2O9 (M=In, Sc) oxides", Journal of Solid State Chemistry 200, 110 (2013). (link)

2012

29. M. Hatnean, J. Robert, M.T. Fernandez Diaz, E. Ressouche, A. Cousson, L. Pinsard-Gaudart, and S. Petit, "Neutron scattering study of the magnetoelectric compound GaFeO3", European Physical Journal Special Topics 213, 69 (2012).
 (link)

MonicaCH

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Contact Details

Department of Physics
University of Warwick
Coventry CV4 7AL
United Kingdom

Contact Details

Office
P154

Telephone
+44 (0)2476574760
Fax
+44 (0)2476150897
E-Mail

M dot Ciomaga-Hatnean at warwick dot ac dot uk