Look Who's at the Lab: Vesna Mitrović (February 2011)

In Look Who's at the Lab, we profile some of the hundreds of scientists who visit our lab every year.

The Basics

Job Title: associate physics professor at Brown University

Mag Lab user since: ~ 1998

Number of visits to lab: about two dozen

Dates of most recent experiment: Dec. 13 – 17, 2010

Your home is in: Providence, RI

Distance traveled (from home to lab):
~ 2,000 km

Research interests: superconductivity, quantum magnets

Web site http://www.physics.brown.edu/people/detail.asp?id=92

E-mail: vemi@brown.edu

 

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Magnet Lab Research

Title: Probing spin texture in magnetic field induced quantum phases in a spin 1/2 triangular-lattice antiferromagnet, Cs₂CuBr₄

Other participants: Lu Lu, Myeonghun Song (Brown University), Arneil Reyes and Phil Kuhns (NHMFL)

Synopsis:Frustrated magnets represent a very interesting class of electronic systems with strong correlations. The low temperature state of these magnets is a disordered spin liquid, in which the motion of spins is highly correlated. The nature of the quantum ground state and elementary excitations in two- and three-dimensional spin liquids is a long-standing problem. We investigate a 2D spin-1/2 Heisenberg antiferromagnet on an anisotropic triangular (frustrated) lattice. On such a lattice, the frustration-fluctuation interplay leads to many new phenomena. We are using NMR microscopy to explore the phase diagram of frustrated materials, identify novel-phase transitions and probe the nature of the states with short- and long-range correlations.

Facility: DC Field Facility, NHMFL, Tallahassee

Equipment: Solid State NMR spectrometer (model: MagRes2000), 3He refrigerator, and cryogenic probes

Techniques: Nuclear magnetic resonance (NMR)

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Quick Q & A

Q: What's the best thing about working at the lab?
A: Having the access to the best technical infrastructure and the best state-of-the-art measurement techniques and instrumentation. I tremendously enjoy working with, and learning from, my colleagues in the lab.

Q: What you miss most about home when you're here:
A: My beautiful tesorinho and my wine!

Q: What's the most unscientific thing about you?
A: I love biking and spending summers somewhere in the Mediterranean, soirees with Luca, pondering on the meaning of life with Karin, that and everything else with tesorinho.

Q: Scientist and non-scientist: Whom would you most like to meet?
A: Well, most of them are dead – so I guess I'll go for non-scientist – Valeria Solarino. (Editor's note: Solarino, 32, is an Italian actress whose movies include "Happiness Costs Nothing," "Secret Journey" and "Sea Purple.")

Q: What are you reading now?
A: "Death with Interruptions" by Jose Saramago (Editor's note: This philosophical, death-takes-a-holiday novel earned a starred review from Publishers Weekly. It centers on what happens when, on New Year's Day, people stop dying.)

Q:Complete this sentence: We could make great strides in science, if we could just figure out how
A: to detect NMR signal from a nano-size, low-dimensional sample.

Q: What advice would you give someone just starting out in your field?
A: Be patient, determined, and love what you do - post proelia praemia.
(Editor's note: "Post proelia praemia" is a Latin phrase that means, "After the battles come the rewards.")

Q: What keeps you awake at night?
A: Doing experiments and/or writing proposals.

Q: Your favorite quote:
A:``Ognuni sta solo sul cuor della terra trafitto da un raggio di sole:
Ed e' subito sera.''
Everyone stands alone at the heart of the world
pierced by a ray of sunlight,
and suddenly it is evening.
S. Quasimodo

Q: Parting thoughts on science today:
A: Science has given us so much from advanced technology to the ultimate satisfaction of understanding the world around us – thus, we have to keep invested in it.

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Selected Publications

• 1. G. Koutroulakis, M. D. Stewart, V. F. Mitrović, M. Horvatić, C. Berthier, G. Lapertot, J. Flouquet, "Field Evolution of Coexisting Superconducting and Magnetic Orders in CeCoIn₅", Phys. Rev. Lett. 104, 087001 (4 pp) (2010).

• 2. M.D. Stewart Jr., G. Koutroulakis, N. Kalechofsky, V. F. Mitrović, "A reusable, low-profile, cryogenic wire seal", Cryogenics 50, 50 (2 pp) (2010).

• 3. Rongwei Hu, V. F. Mitrović, and C. Petrovic, "Magnetism and metal-insulator transition in Fe(Sb_1-xTe_x)2", Phys. Rev. B 79, 064510 (5 pp) (2009).

• 4. G. Koutroulakis, V. F. Mitrović, M. Horvatić, C. Berthier, G. Lapertot, J. Flouquet, "Field Dependence of the Ground State in the Exotic Superconductor CeCoIn₅: a Nuclear Magnetic Resonance Investigation", Phys. Rev. Lett. 101, 047004 (4 pp) (2008).

• 5. M.A. Vachon, G. Koutroulakis, V. F. Mitrović, R. Coldea, and Z. Tylczynski, "Anisotropic Transferred Hyperfine Interactions in Cs₂CuCl₄", J. Phys.: Condens. Matter, 20, 295225 (8 pp) (2008).

• 6. V. F. Mitrović, G. Koutroulakis, M. Klanjšek, M. Horvatić, C. Berthier, G. Knebel, G. Lapertot, J. Flouquet, Comment on "Texture in the Superconducting Order Parameter of CeCoIn₅ Revealed by Nuclear Magnetic Resonance", Phys. Rev. Lett. 101, 039701 (1 pp) (2008).

• 7. V. F. Mitrović, C. de Vaulx, M. Horvatić, C. Berthier, T. Suzuki, K. Yamada, M.H. Julien, "Similar glassy features in the ¹³⁹La NMR response of pure and disordered La_1.88Sr_0.12CuO₄", Phys. Rev. B 78, 014504 (7 pp) (2008).

• 8. Rongwei Hu, V. F. Mitrović, and C. Petrovic, "Giant Carrier Mobility in Single Crystals of FeSb₂", Appl. Phys. Lett. 92, 182108 (3 pp) (2008).

• 9. Rongwei Hu, Y. Lee, J. Hudis, V. F. Mitrović, and C. Petrovic, "Composition and field-tuned magnetism and superconductivity in Nd_1-xCe_xCoIn₅", Phys. Rev. B 77, 165129 (6 pp) (2008).

• 10. Rongwei Hu, K. J. Thomas, Y. Lee, T. Vogt, E. S. Choi, V. F. Mitrović, R. P. Hermann, F. Grandjean, P. C. Canfield, J. W. Kim, A. I. Goldman, and C. Petrovic, "Colossal Positive Magnetoresistance in a Doped Nearly Magnetic Semiconductor", Phys. Rev. B 77, 085212 (5 pp) (2008).

• 11. V. F. Mitrović, G. Koutroulakis, M. A. Vachon, M. Horvatić, C. Berthier, G. Knebel, G. Lapertot, J. Flouquet, "Phase Diagram of CeCoIn₅ in the Vicinity of H_c2 as Determined by NMR", Physica B, 403, 986-989 (2008).

• 12. Rongwei Hu, R. P. Hermann, F. Grandjean, Y. Lee, J. B. Warren, V. F. Mitrović, and C. Petrovic, "Weak ferromagnetism in Fe_1-xCo_xSb₂", Phys. Rev. B 76, 224422 (6 pp) (2007).

• 13. V. F. Mitrović, M. Horvatić, C. Berthier, M. Shayegan, "NMR Study of Large Skyrmions in Al_0.13Ga_0.87As Quantum Wells", Phys. Rev. B 76, 115335 (6 pp) (2007).

• 14. Rongwei Hu, V. F. Mitrović, and C. Petrovic, "Anisotropy in magnetic and transport properties of Fe_1-xCr_xSb₂", Phys. Rev. B 76, 115105 (5 pp) (2007).

• 15. N. D. Daniilidis, I. K. Dimitrov, V. F. Mitrović, C. Elbaum, and X. S. Ling, "Magnetocaloric studies of the peak effect in Nb", Phys. Rev. B 75, 174519 (11 pp) (2007).

• 16. Rongwei Hu, K. Lauritch-Kullas, J. O'Brian, V. F. Mitrović, and C. Petrovic, "Anisotropy of Electrical Transport and Superconductivity in Metal Chains of Nb₂Se₃", Phys. Rev. B. 75, 064517 (5 pp) (2007).

• 17. Bo Chen, W. P. Halperin, Prasenjit Guptasarma, D. G. Hinks, V. F. Mitrović, A. P. Reyes, P. Kuhns, "Two-dimensional Vortices in Superconductors", Nature Physics 3, 239-242 (2007).

• 18. A. Perucchi, L. Digiorgi, R. Hu, C. Petrović, V. F. Mitrović, "Optical investigation of the metal-insulator transition in FeSb₂", Euro. Phys. J. B 54, 175-183 (2006).

• 19. V. F. Mitrović, M. Horvatić, C. Berthier, G. Knebel, G. Lapertot, J. Flouquet, "Observation of Spin Susceptibility Enhancement in the Possible Fulde-Ferrell-Larkin-Ovchinnikov State of CeCoIn₅", Phys. Rev. Lett. 97, 117002 (4 pp) (2006).

• 20. Rongwei Hu, V. F. Mitrović, and C. Petrović, "Anisotropy in magnetic and transport properties of Fe_1-xCo_xSb₂", Phys. Rev. B 74, 195130 (6 pp) (2006).

• 21. Bo Chen, Pratim Sengupta, W. P. Halperin, E. E. Sigmund, V. F. Mitrović, M. H. Lee, K. H. Lee, C. Y. Kwak, J. S. Rhee, C. A. Kim, B. K. Cho, "Anisotropy and Penetration Depth of MgB₂ from ¹¹B NMR", New J. Phys. 8 274 (10 pp) (2006).

• 22. M.A. Vachon, W. Kundhikanjana, A. Straub, and V. F. Mitrović, P. Reyes, P. Kuhns, R. Coldea, Z. Tylczynski, "¹³³Cs NMR investigation of 2D frustrated Heisenberg antiferromagnet, Cs₂CuCl₄", New J. Phys. 8, 222 (14 pp) (2006).

• 23. J. Hudis, R. Hu, C. L. Broholm, V. F. Mitrović, C. Petrovic, "Magnetic and transport
  properties of RCoIn₅ (R = Pr, Nd) and RCoGa₅ (T = Tb-Tm)", J. Mag. & Mag. Mat. 307, 301-307 (2006).

• 24. V. F. Mitrović, E. E. Sigmund, W. P. Halperin, "NMR Lineshape in the Vortex Lattice State of Near-Optimally Doped YBa₂Cu₃O_7-δ;", Proceedings of LT23, Physica C 388-389, 629-630 (2003).

• 25. V. F. Mitrović, E. E. Sigmund, W. P. Halperin, A. P. Reyes, P. Kuhns, W. G. Moulton,
  "Antiferromagnetism in the Vortex Cores of YBa₂Cu₃O_7-δ;", Phys. Rev. B 67, 220503(R) (4 pp) (2003).

• 26. E. E. Sigmund, V. F. Mitrović, E. S. Calder, G. W. Thomas, H. N. Bachman, W. P. Halperin, P. Kuhns, A. P. Reyes, "Inductive Shielding of NMR Phase Noise", J. Mag. Res. 159, 190-194 (2002).

• 27. G. W. Thomas, H. N. Bachman, E. E. Sigmund, V. F. Mitrović, E. S. Calder, W. P. Halperin, "Polar Signal Averaging", Conc. Magn. Reson. 14, 359-364 (2002).

• 28. V. F. Mitrović, H. N. Bachman, W. P. Halperin, A. P. Reyes, P. Kuhns, W. G. Moulton, "The Pseudogap in YBa₂Cu₃O₇ Tested by NMR in High Magnetic Fields", Phys. Rev. B 66, 014511 (7 pp) (2002).

• 29. V. F. Mitrović, E. E. Sigmund, M. Eschrig, H. N. Bachman, W. P. Halperin, A. P. Reyes, P. Kuhns, W. G. Moulton, "Spatially resolved electronic structure inside and outside the vortex cores of a high-temperature superconductor", Nature 413, 501-504 (2001).

• 30. V. F. Mitrović, E. E. Sigmund, W. P. Halperin, "Progressive Saturation NMR Relaxation", Phys. Rev. B 64, 024520 (7 pp) (2001).

• 31. E. E. Sigmund, E. S. Calder, G. W. Thomas, V. F. Mitrović, H. N. Bachman, W. P. Halperin, A. P. Reyes, P. Kuhns, "NMR Phase Noise in Bitter Magnets", J. Mag. Res. 148(2), 309-313 (2001).

• 32. V. F. Mitrović, H. N. Bachman, A. P. Reyes, W. P. Halperin, M. Eschrig, J. A. Sauls, P. Kuhns, W. G. Moulton, "Superconducting Fluctuation Effects on the Spin Lattice Relaxation Rate in YBa₂Cu₃O₇", Phys. Rev. Lett. 82, 2784-2787 (1999).

• 33. H. N. Bachman, V. F. Mitrović, A. P. Reyes, W. P. Halperin, M. Eschrig, J. A. Sauls,
  A. Kleinhammes, P. Kuhns, W. G. Moulton, "Superconducting Fluctuation Effects on the Electron Spin Susceptibility in YBa₂Cu₃O₇", Phys. Rev. B 60, 7591-7594 (1999).

• 34. H. N. Bachman, A. P. Reyes, V. F. Mitrović, W. P. Halperin, A. Kleinhammes, P. Kuhns, W. G. Moulton, "High Field Vortex Dynamics from ¹⁷O nuclear magnetic resonance", Phys. Rev. Lett. 80, 1726-1729 (1998).

• 35. P. Bandyopadhyay, B. Boyanov, V. Mitrović, G. Bunker, "Numerical Simulation of Flux Density Spectra for Tapered Undulators", Rev. Sci. Inst. 66 (2), 1854-1855 (1995).

   

   

Date posted: Feb. 2011

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