Rafael Fernandes

University of Minnesota

Prof. Rafael Fernandes


Assistant Professor
School of Physics and Astronomy
University of Minnesota
116 Church Street SE
Minneapolis, MN, 55455, USA
phone: 612-625-9283

e-mail: rfernandatumn.edu

Rafael Fernandes

My alma mater is the State University of Campinas, in Brazil, where I received my Bachelor degree (2003),
my MSc (2005), and my PhD in Physics (2008).

Before joining the University of Minnesota, I was a postdoc at Ames Laboratory (2008-2011) and
a joint postdoc at Columbia University / Los Alamos National Lab (2011-2012).

             

Research Interests

I am a theorist working on strongly correlated electronic many-body systems. My interests are very broad, and much
of my research is strongly experiment-oriented. In general, I am interested in clean and disordered systems in which
ordered phases associated with different broken symmetries are present, such as superconductivity, magnetism, structural
ordering and electronic liquid-crystalline states. Here are some of the topics I have been working on lately:

Group Members

Funding

Publication List

An updated list of my publications may be found in arXiv or in my researcher ID webpage .
  1. Distinguishing spin-orbit coupling and nematic order in the electronic spectrum of iron-based superconductors
    R. M. Fernandes and O. Vafek,
    arxiv:1411.4303
  2. Sharp enhancement of spin fluctuations by nematic order in iron pnictides
    Q. Zhang, R. M. Fernandes, J. Lamsal, J. Yan, S. Chi, G. S. Tucker, D. K. Pratt, J. W. Lynn, R. W. McCallum, P. C. Canfield, T. A. Lograsso, A. I. Goldman, D. Vaknin, and R. J. McQueeney,
    arxiv:1410.6855
  3. Magnetic order without tetragonal symmetry-breaking in iron arsenides: microscopic mechanism and spin-wave spectrum
    X. Wang, J. Kang, and R. M. Fernandes,
    arxiv:1410.6789
  4. Manipulation of gap nodes by uniaxial strain in iron-based superconductors
    J. Kang, A. F. Kemper, and R. M. Fernandes,
    Phys. Rev. Lett. 113, 217001 (2014)
  5. Time-reversal symmetry breaking superconductivity in the coexistence phase with magnetism in Fe-pnictides
    A. Hinojosa, R. M. Fernandes, and A. V. Chubukov,
    Phys. Rev. Lett. 113, 167001 (2014)
  6. Theory of the evolution of magnetic order in Fe1+yTe compounds with increasing interstitial iron
    S. Ducatman, R. M. Fernandes, and N. B. Perkins,
    Phys. Rev. B 90, 165123 (2014)
  7. Visualizing the charge density wave transition in 2H-NbSe2 in real space
    C. J. Arguello, S. P. Chockalingam, E.P. Rosenthal, L. Zhao, C. Gutiérrez, J. H. Kang, W. C. Chung, R. M. Fernandes, S. Jia, A. J. Millis, R. J. Cava, and A. N. Pasupathy,
    Phys. Rev. B 89, 235115 (2014) (Editor's suggestion)
  8. Possible unconventional superconductivity in substituted BaFe2As2 revealed by magnetic pair-breaking studies
    P. F. S. Rosa, C. Adriano, T. M. Garitezi, M. M. Piva, K. Mydeen, T. Grant, Z. Fisk, M. Nicklas, R. R. Urbano, R. M. Fernandes, and P. G. Pagliuso,
    Sci. Rep. 4, 6252 (2014)
  9. Competition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped Ba1-xKxFe2As2
    H. Kim, M. A. Tanatar, W. E. Straszheim, K. Cho, J. Murphy, N. Spyrison, J.-Ph. Reid, Bing Shen, Hai-Hu Wen, R. M. Fernandes, and R. Prozorov,
    Phys. Rev. B 90, 014517 (2014)
  10. Crossover from spin-waves to diffusive spin excitations in underdoped Ba(Fe1-xCox)2As2
    G. S. Tucker, R. M. Fernandes, D. K. Pratt, A. Thaler, N. Ni, K. Marty, A. D. Christianson, M. D. Lumsden, B. C. Sales, A. S. Sefat, S. L. Bud'ko, P. C. Canfield, A. Kreyssig, A. I. Goldman, and R. J. McQueeney,
    Phys. Rev. B 89, 180503(R) (2014)
  11. Antiferromagnetism in iron-based superconductors: selection of magnetic order and quasiparticle interference
    I. Eremin, J. Knolle, R. M. Fernandes, J. Schmalian, and A. V. Chubukov,
    J. Phys. Soc. Jpn. 83, 061015 (2014)
  12. Impact of local-moment fluctuations on the magnetic degeneracy of iron arsenide superconductors
    X. Y. Wang and R. M. Fernandes,
    Phys. Rev. B 89, 144502 (2014)
  13. What drives nematic order in iron-based superconductors?
    R. M. Fernandes, A. V. Chubukov, and J. Schmalian,
    Nature Phys. 10, 97 (2014)
  14. Visualization of electron nematicity and unidirectional antiferroic fluctuations at high temperatures in NaFeAs
    E. P. Rosenthal, E. F. Andrade, C. J. Arguello, R. M. Fernandes, L. Y. Xing, X. C. Wang, C. Q. Jin, A. J. Millis, and A. N. Pasupathy,
    Nature Phys. 10, 225 (2014) (featured in the News and Views section; cover of the March-2014 issue)
  15. Ultrafast observation of critical nematic fluctuations and giant magnetoelastic coupling in iron pnictides
    A. Patz, T. Li, S. Ran, R. M. Fernandes, J.Schmalian, S. L. Bud'ko, P. C. Canfield, I. E. Perakis, and J. Wang,
    Nature Comm. 5, 3229 (2014)
  16. Pressure effects on magnetic pair-breaking in Mn- and Eu-substituted BaFe2As2
    P. F. S. Rosa, T. M. Garitezi, C. Adriano, T. Grant, Z. Fisk, R. R. Urbano, R. M. Fernandes, and P. G. Pagliuso,
    J. Appl. Phys. 115, 17D702 (2014)
  17. Observation of incipient charge nematicity in Ba(Fe1-xCox)2As2
    Y. Gallais, R. M. Fernandes, I. Paul, L. Chauviere, Y.-X. Yang, M.-A. Measson, M. Cazayous, A. Sacuto, D. Colson, and A. Forget,
    Phys. Rev. Lett. 111, 267001 (2013)
  18. Scaling between magnetic and lattice fluctuations in iron-pnictide superconductors
    R. M. Fernandes, A. E. Böhmer, C. Meingast, and J. Schmalian,
    Phys. Rev. Lett. 111, 137001 (2013)
  19. Nematicity as a probe of superconducting pairing in iron-based superconductors
    R. M. Fernandes and A. J. Millis,
    Phys. Rev. Lett. 111, 127001 (2013)
  20. How many quantum phase transitions exist inside the superconducting dome of the iron pnictides?
    R. M. Fernandes, S. Maiti, P. Wölfle, and A. V. Chubukov,
    Phys. Rev. Lett. 111, 057001 (2013)
  21. Sign-reversal of the in-plane resistivity anisotropy in hole-doped iron pnictides
    E. C. Blomberg, M. A. Tanatar, R. M. Fernandes, I. I. Mazin, B. Shen, H.-H. Wen, M. D. Johannes, J. Schmalian, and R. Prozorov,
    Nature Comm. 4, 1914 (2013)
  22. Uniaxial stress effects on the structural and electronic properties of BaFe2As2 and CaFe2As2
    M. Tomic, H. O. Jeschke,R. M. Fernandes, and R. Valenti,
    Phys. Rev. B 87, 174503 (2013)
  23. Suppression of superconductivity by Neel-type magnetic fluctuations in the iron pnictides
    R. M. Fernandes and A. J. Millis,
    Phys. Rev. Lett. 110, 117004 (2013)
  24. Electronic transport in the Coulomb phase of the pyrochlore spin ice
    G.-W. Chern, S. Maiti, R. M. Fernandes and P. Wölfle,
    Phys. Rev. Lett. 110, 146602 (2013)
  25. Two-band superconductivity in doped SrTiO3 films and interfaces
    R. M. Fernandes, J. T. Haraldsen, P. Wölfle, and A. V. Balatsky,
    Phys. Rev. B 87, 014510 (2013)
  26. Magneto-elastically coupled structural, magnetic and superconducting order parameters in BaFe2 (As1-xPx)2
    H-.H. Kuo, J. G. Analytis, J.-H. Chu, R. M. Fernandes, J. Schmalian, and I. R. Fisher,
    Phys. Rev. B 86, 134507 (2012)
  27. Broken translational symmetry in an emergent paramagnetic phase of graphene
    G. W. Chern, R. M. Fernandes, R. Nandkishore, and A. V. Chubukov,
    Phys. Rev. B 86, 115443 (2012)
  28. Manifestations of nematic degrees of freedom in the magnetic, elastic, and superconducting properties of the iron pnictides
    R. M. Fernandes and J. Schmalian,
    Supercond. Sci. Technol. 25, 084005 (2012) (invited submission, focus issue on Fe pnictides)
  29. Magnetic excitations in underdoped Ba(Fe1-xCox)2As2 with x=0.047
    G. S. Tucker, R. M. Fernandes, H.-F. Li, V. Thampy, N. Ni, D. L. Abernathy, S. L. Bud'ko, P. C. Canfield, D. Vaknin, J. Schmalian, and R. J. McQueeney,
    Phys. Rev. B 86, 024505 (2012)
  30. Enhancement of Tc by disorder in underdoped iron pnictides
    R. M. Fernandes, M. G. Vavilov, and A. V. Chubukov,
    Phys. Rev. B 85, 140512(R) (2012)
  31. Gap nodes induced by coexistence with antiferromagnetism in iron-based superconductors
    S. Maiti, R. M. Fernandes, and A. V. Chubukov,
    Phys. Rev. B 85, 144527 (2012) (Editor's suggestion)
  32. Effect of tensile stress on the in-plane resistivity anisotropy in BaFe2As2
    E. C. Blomberg, A. Kreyssig, M. A. Tanatar, R. M. Fernandes, M. G. Kim, A. Thaler, J. Schmalian, S. L. Bud'ko, P. C. Canfield, A. I. Goldman, and R. Prozorov,
    Phys. Rev. B 85, 144509 (2012)
  33. Preemptive nematic order, pseudogap, and orbital order in the iron pnictides
    R. M. Fernandes, A. V. Chubukov, J. Knolle, I. Eremin, and J. Schmalian,
    Phys. Rev. B 85, 024534 (2012)
  34. What controls the phase diagram and superconductivity in Ru substituted BaFe2As2?
    R. S. Dhaka, C. Liu, R. M. Fernandes, R. Jiang, C. P. Strehlow, T. Kondo, A. Thaler, J. Schmalian, S. L. Bud'ko, P. C. Canfield, and A. Kaminski,
    Phys. Rev. Lett. 107, 267002 (2011)
  35. Anisotropic in-plane resistivity in the nematic phase of the iron pnictides
    R. M. Fernandes, E. Abrahams, and J. Schmalian,
    Phys. Rev. Lett. 107, 217002 (2011)
  36. Scaling of nascent nodes in extended-s-wave superconductors
    R. M. Fernandes and J. Schmalian,
    Phys. Rev. B 84, 012505 (2011)
  37. Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe1-xCox)2As2
    C. Liu, A. D. Palczewski, R. S. Dhaka, T. Kondo, R. M. Fernandes, E. D. Mun, H. Hodovanets, A. N. Thaler, J. Schmalian, S. L. Bud'ko, P. C. Canfield, and A. Kaminski,
    Phys. Rev. B 84, 020509(R) (2011)
  38. Character of the structural and magnetic phase transitions in the parent and electron doped BaFe2As2 compounds
    M. G. Kim, R. M. Fernandes, A. Kreyssig, J. W. Kim, A. Thaler, S. L. Bud'ko, P. C. Canfield, R. J. McQueeney, J. Schmalian, and A. I. Goldman,
    Phys. Rev. B 83, 134522 (2011)
  39. Complex critical exponents for percolation transitions in Josephson-junction arrays, antiferromagnets, and interacting bosons
    R. M. Fernandes and J. Schmalian,
    Phys. Rev. Lett. 106, 067004 (2011)
  40. Anisotropic and quasi-propagating spin excitations in optimally-doped superconducting Ba(Fe0.926Co0.074)As2
    H.-F. Li, C. Broholm, D. Vaknin, R. M. Fernandes, D. L. Abernathy, M. B. Stone, D. K. Pratt, W. Tian, Y. Qiu, N. Ni, S. O. Diallo, J. L. Zarestky, S. L. Bud'ko, P. C. Canfield, and R. J. McQueeney,
    Phys. Rev. B 82, 140503(R) (2010) (Editor's suggestion)
  41. Effects of nematic fluctuations on the elastic properties of iron arsenide superconductors
    R. M. Fernandes, L. H. VanBebber, S. Bhattacharya, P. Chandra, V. Keppens, D. Mandrus, M. A. McGuire, B. C. Sales, A. S. Sefat, and J. Schmalian,
    Phys. Rev. Lett. 105, 157003 (2010)
  42. Interface energy of two band superconductors
    J. Geyer, R. M. Fernandes, V. G. Kogan, and J. Schmalian,
    Phys. Rev. B 82, 104521 (2010) (Editor's suggestion)
  43. Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of Ba(Fe1-xCox)2As2
    R. T. Gordon, H. Kim, N. Salovich, R. W. Giannetta, R. M. Fernandes, V. G. Kogan, T. Prozorov, S. L. Bud'ko, P. C. Canfield, M. A. Tanatar, and R. Prozorov,
    Phys. Rev. B 82, 054507 (2010) (Editor's suggestion)
  44. Transfer of optical spectral weight in magnetically ordered superconductors
    R. M. Fernandes and J. Schmalian,
    Phys. Rev. B 82, 014520 (2010)
  45. Competing order and nature of the pairing state in the iron pnictides
    R. M. Fernandes and J. Schmalian,
    Phys. Rev. B 82, 014521 (2010) (Editor's suggestion)
  46. Paramagnetic spin correlations in CaFe2As2 single crystals
    S. O. Diallo, D. K. Pratt, R. M. Fernandes, W. Tian, J. L. Zarestky, M. Lumsden, T. G. Perring, C. L. Broholm, N. Ni, S. L. Bud'ko, P. C. Canfield, H.-F. Li, D. Vaknin, A. Kreyssig, A. I. Goldman, and R. J. McQueeney,
    Phys. Rev. B 81, 214407 (2010)
  47. Unconventional pairing in the iron arsenide superconductors
    R. M. Fernandes, D. K. Pratt, W. Tian, J. Zarestky, A. Kreyssig, S. Nandi, M. G. Kim, A. Thaler, N. Ni, P. C. Canfield, R. J. McQueeney, J. Schmalian, and A. I. Goldman,
    Phys. Rev. B 81, 140501(R) (2010) (Editor's suggestion)
  48. Evidence for a Lifshitz transition in electron-doped iron arsenic superconductors at the onset of superconductivity
    C. Liu, T. Kondo, R. M. Fernandes, A. D. Palczewski, E. D. Mun, N. Ni, A. Thaler, A. Bostwick, E. Rotenberg, J. Schmalian, S. L. Bud'ko, P. C. Canfield, and A. Kaminski,
    Nature Phys. 6, 419 (2010)
  49. Unusual Fermi surface nesting in parent compounds of iron arsenic high temperature superconductors revealed by Angle Resolved Photoemission Spectroscopy
    T. Kondo, R. M. Fernandes, R. Khasanov, C. Liu, A. D. Palczewski, N. Ni, M. Shi, A. Bostwick, E. Rotenberg, J. Schmalian, S. L. Bud'ko, P. C. Canfield, and A. Kaminski,
    Phys. Rev. B 81, 060507(R) (2010)
  50. Anomalous suppression of the orthorhombic distortion in superconducting Ba(Fe1-xCox)2As2
    S. Nandi, M. G. Kim, A. Kreyssig, R. M. Fernandes, D. K. Pratt, A. Thaler, N. Ni, S. L. Bud'ko, P. C. Canfield, J. Schmalian, R. J. McQueeney, and A. I. Goldman,
    Phys. Rev. Lett. 104, 057006 (2010)
  51. Orbital coupling and superconductivity in the iron pnictides
    J. Zhang, R. Sknepnek, R. M. Fernandes, and J. Schmalian,
    Phys. Rev. B 79, 220502(R) (2009)
  52. Conductivity of electronic liquid-crystalline mesophases
    R. M. Fernandes, J. Schmalian, and H. Westfahl Jr.,
    Phys. Rev. B 78, 184201 (2008)
  53. Universality of liquid-gas Mott transitions at finite temperatures
    S. Papanikolaou, R. M. Fernandes, E. Fradkin, P. W. Phillips, J. Schmalian, and R. Sknepnek,
    Phys. Rev. Lett. 100, 026408 (2008)
  54. Domain wall formation and spin reorientation in finite-size magnetic system
    R. M. Fernandes, H. Westfahl Jr., R. Magalhaes-Paniago, and L. N. Coelho,
    J. Magn. Magn. Mater. 312, 314 (2007)
  55. Fluctuation induced first-order phase transitions in a dipolar Ising ferromagnetic slab
    R. M. Fernandes and H. Westfahl Jr.,
    Phys. Rev. B 74, 144421 (2006)
  56. Magnetic reconfiguration of MnAs/GaAs(001) observed by Magnetic Force Microscopy and Resonant Soft X-ray Scattering
    L. N. Coelho, B. R. A Neves, R. Magalhaes-Paniago, F. C. Vicentin, H. Westfahl Jr., R. M. Fernandes, F. Iikawa, L. Daweritz, C. Spezzani, and M. Sacchi,
    J. Appl. Phys. 100, 083906 (2006)
  57. Motion of a particle with isospin in the presence of a monopole
    R. M. Fernandes and P. S. Letelier,
    Phys. Lett. A 341, 22 (2005)

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