Dissertation Title Currently At Low-Temperature Thermal Conductivity in the Metal-Organic Frameworks (MOFs) [C(NH2)3][B(HCOO)3] (B = Cu2+, Zn2+,Ni2+) postdoc, Florida State Univ. Low-Temperature Spin Seebeck effect in the Helimagnetic Insulator Cu2OSeO3 postdoc, Univ. Miami postdoc, 2015-2018 Visiting Asst. Prof., St. Mary's College, MD Anisotropic Transport Properties of Low-dimensional Molybdenum Bronzes postdoc, Fl. Int.'l Univ. undergrad, 2014-15 physics graduate student, Univ. Illinois UC Spin-Phonon Coupling And Magnetic Heat Transport In Low-Dimensional Quantum Antiferromagnets (2015) postdoc, Univ. Miami postdoc, 2013-14 National University of Singapore Studies of the Insulator-Metal Transition in La1-xCaxMnO3 and Thin-Film Growth of Nd0.2Sr0.8MnO3 (2009) Transport Studies of Lightly Electron-Doped Manganese Oxides (2008) M.S. Degree Editor, John Wiley and Sons postdoc Laboratoire Louis Neel, Grenoble Roland Maier Novel Phase of Thin-Film Iron-Doped Barium Titanate (2002) Gymnasium Instructor, Heidelberg, Germany Thermal Transport and Phase Behavior of Cuprate Superconductors (1997) CISCO Systems University of HoustonPost-doctoral Fellows
a.akopyan@umiami.edu
Former Lab Members
Mary O. Olagunju, Elsayed M. Zahran, Elnaz Zeynaloo, Dharmendra Shukla, Joshua L. Cohn, Bapurao Surnar, Shanta Dhar, Leonidas G. Bachas, and Marc R. Knecht, Design of Pd-Decorated SrTiO3/BiOBr Heterojunction Materials for Enhanced Visible-Light-Based Photocatalytic Reactivity, Langmuir 37, 11986 (2021). (Full Text PDF) Mary O. Olagunju, Elsayed M. Zahran, Jacqueline M. Reed, Elnaz Zeynaloo, Dharmendra Shukla, Joshua L. Cohn, Bapurao Surnar, Shanta Dhar, Leonidas G. Bachas, and Marc R. Knecht, Halide Effects in BiVO4/BiOX Heterostructures Decorated with Pd Nanoparticles for Photocatalytic Degradation of Rhodamine B as a Model Organic Pollutant, ACS Applied Nano Materials 4, 3262 (2021). (Full Text PDF) Ahmed E. ElMetwally, Elnaz Zeynaloo, Dharmendra Shukla, Bapurao Surnar, Shanta Dhar, Joshua L. Cohn, Marc R. Knecht, and Leonidas G. Bachas, Cu2O Cubes Decorated with Azine-Based Covalent Organic Framework Spheres and Pd Nanoparticles as Tandem Photocatalyst for Light-Driven Degradation of Chlorinated Biphenyls, ACS Applied Nano Materials 4, 2795 (2021). (Full Text PDF) Mary O. Olagunju, Xavier Poole, Patricia Blackwelder, Melonie P. Thomas, Beth S. Guiton, Dharmendra Shukla, Joshua L. Cohn, Bapurao Surnar, Shanta Dhar, Elsayed M. Zahran, Leonidas G. Bachas, and Marc R. Knecht, Size-Controlled SrTiO3 Nanoparticles Photodecorated with Pd Cocatalysts for Photocatalytic Organic Dye Degradation, ACS Applied Nano Materials 3, 4904 (2020). (Full Text PDF) D. S. Inosov, Y. O. Onykiienko, Y. V. Tymoshenko, A. Akopyan, D. Shukla, N. Prasai, M. Doerr, S. Zherlitsyn, D. Voneshen M. Boehm, V. Tsurkan, V. Felea, A. Loidl, and J. L. Cohn, Magnetic-field dependence of low-energy magnons, anisotropic heat conduction, and spontaneous relaxation of magnetic domains in the cubic helimagnet ZnCr2Se4, Physical Review B 102, 184431 (2020). (Full Text PDF) Mahamalage Kusumitha Perera, James D. Englehardt, Joshua L. Cohn, Edward A Dauer, Dharmendra Shukla, Electrohydromodulation for phosphate recovery from wastewater, Separation and Purification Technology 247, 116909 (2020). (Full Text PDF) A. Akopyan, N. Prasai, B. A. Trump, G. G. Marcus, T. M. McQueen, and J. L. Cohn, Spin Seebeck Effect in Cu2OSeO3: Test of Bulk Magnon Spin-Current Theory, Physical Review B 101, 100407(R) (2020). (Full Text PDF) D. Shukla, N. Prasai, T. M. Carlino, M. M. A. Mazza, A. M. Scott, and J. L. Cohn, Anisotropic Heat Conduction in the Metal Organic Framework Perovskites [C(NH2)3]X(HCOO)3 (X=Cu, Zn), Applied Physics Letters 114, 081907 (2019). (Full Text PDF) N. Prasai, A. Akopyan, B. A. Trump, G. G. Marcus, S. X. Huang, T. M. McQueen, and J. L. Cohn, Spin phases of the helimagnetic insulator Cu2OSeO3 probed by magnon heat conduction, Physical Review B 99, 020403(R) (2019). (Full Text PDF) D. C. Bell, C. J. Munro, J. M. Slocik, D. Shukla, A. D. Parab, J. Cohn, and M. Knecht, Biomimetic strategies to produce catalytically reactive CuS nanodisks, Nanoscale Advances 1, 2857-2865 (2019). (Full Text PDF) C. J. Munro, E. C. Bell, M. O. Olagunju, J. L. Cohn, E. M. Zahran, L. G. Bachas, and M. R. Knecht, Amino Acids for Sustainable Production of Cu2O Materials: Effects on Morphology and Photocatalytic Reactivity, ACS Sustainable Chemistry and Engineering 7, 17055-17064 (2019). (Full Text PDF) N. Prasai, A. B. Christian, J. J. Neumeier, and J. L. Cohn, Resonant scattering of phonons in the quasi-one-dimensional spin-chain compounds AB2O6 (A = Ni, Co; B = Sb, Ta) , Physical Review B 98, 134449 (2018). (Full Text PDF) N. Prasai, B. A. Trump, G. G. Marcus, A. Akopyan, S. X. Huang, T. M. McQueen, and J. L. Cohn, Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu2OSeO3, Physical Review B 95, 224407 (2017). (Full Text PDF) S. Moshfeghyeganeh, A. N. Cote, J. J. Neumeier and J. L. Cohn, Anisotropic transport in the quasi-one-dimensional semiconductor Li0.33MoO3, J. Appl. Phys. 119, 095105 (2016). (Full Text PDF) S. H. Masunaga, A. Rebello, A. T. Schye, N.Prasai, J. J. Neumeier, and J. L. Cohn, Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi4O10): Observation of structural phase transitions, J. Phys. Chem. Sol. 85, 69 (2015). (Full Text PDF) N. Prasai, A. Rebello, A. B. Christian, J. J. Neumeier, and J. L. Cohn, Phonon-spin scattering and magnetic heat transport in the quasi-one-dimensional spin-1/2 antiferromagnetic chain compound CuSb2O6, Physical Review B 91, 054403 (2015). (Full Text PDF) J. L. Cohn, S. Moshfeghyeganeh, C. A. M. dos Santos, and J. J. Neumeier, Extreme Thermopower Anisotropy and Interchain Transport in the Quasi-One- Dimensional metal Li0.9Mo6O17, Physical Review Letters 112, 186602 (2014). (Full Text PDF) J. L. Cohn, P. Boynton, J. S. Triviño, J. Trastoy, B. D. White, C. A. M. dos Santos, and J. J. Neumeier, Stoichiometry, structure, and transport in the quasi-one- dimensional metal Li0.9Mo6O17, Physical Review B 86, 195143 (2012). (Full Text PDF) E. J. Moon, J. M. Rondinelli, N. Prasai, B. A. Gray, M. Kareev, J. Chakhalian, and J. L. Cohn, Strain-controlled band engineering and self-doping in ultrathin LaNiO3 films, Physical Review B 85, 121106(R) (2012). (Full Text PDF) J. L.Cohn, B. D. White, C. A. M. dos Santos, and J. J. Neumeier, Giant Nernst Effect and Bipolarity in the Quasi-One-Dimensional Metal Li0.9Mo6O17, Physical Review Letters 108, 056604 (2012). (Full Text PDF) J. Chakhalian, J. M. Rondinelli, Jian Liu, B. A. Gray, M. Kareev, E. J. Moon, N. Prasai, J. L. Cohn, M. Varela, I. C. Tung, M. J. Bedzyk, S. G. Altendorf, F. Strigari, B. Dabrowski, L. H. Tjeng, P. J. Ryan, and J.W. Freeland, Asymmetric Orbital-Lattice Interactions in Ultrathin Correlated Oxide Films, Physical Review Letters 107, 116805 (2011). (Full Text PDF) A. de Campos, M. S. da Luz, C. A. M. dos Santos, A. T. Rice, A. M. Deml, B. D. White, J. J. Neumeier, and J. L. Cohn, Physical properties of quasi-one-dimensional SrNbO3.41 and Luttinger liquid analysis of electrical transport, Physical Review B 82, 125117 (2010). (Full Text PDF) K. Neupane, J. J. Neumeier, and J. L. Cohn, Anisotropic in-plane strain and transport in epitaxial Nd0.2Sr0.8MnO3 thin films, Journal of Applied Physics 106, 123904 (2009). (Full Text PDF) B. D. White, J. A. Souza, C. Chiorescu, J. J. Neumeier, and J. L. Cohn, Magnetic, transport, and thermodynamic properties of CaMn2O4 single crystals, Physical Review B 79, 104427 (2009). (Full Text PDF) C. Chiorescu, J. J. Neumeier, and J. L. Cohn, Giant Electrothermal Conductivity and Spin-Phonon Coupling in an Antiferromagnetic Oxide, Physical Review Letters 101, 257202 (2008). (Full Text PDF) C. Chiorescu, J. L. Cohn, and J. J. Neumeier, Impurity conduction and magnetic polarons in antiferromagnetic oxides, Physical Review B 76, 020404(R) (2007). (Full Text PDF) K. P. Neupane, J. L. Cohn, H. Terashita, and J. J. Neumeier, Doping dependence of polaron hopping energies in La1-xCaxMnO3 (0 < x < 0.15), Physical Review B 74, 144428 (2006). (Full Text PDF) M. A. Pires, C. Israel, W. Iwamoto, R. R. Urbano, O. Agüero, I. Torriani, C. Rettori, P. G. Pagliuso, L. Walmsley, Z. Le, J. L. Cohn, and S. B. Oseroff, Role of oxygen vacancies in the magnetic and dielectric properties of the high-dielectric-constant system CaCu3Ti4O12: An electron-spin resonance study, Physical Review B 73, 224404 (2006). (Full Text PDF) C. Chiorescu, J. J. Neumeier, and J. L. Cohn, Magnetic inhomogeneity and magnetotransport in electron-doped Ca1-xLaxMnO3 (0 < x < 0.10) Physical Review B 73, 014406 (2006). (Full Text PDF) J. L. Cohn, C. Chiorescu, and J. J. Neumeier, Polaron transport in the paramagnetic phase of electron-doped manganites, Physical Review B 72, 024422 (2005). (Full Text PDF) J. L. Cohn, M. Peterca, and J. J. Neumeier, Giant dielectric permittivity of electron-doped manganite thin films, Ca1-xLaxMnO3 (0<=x<=0.03), Journal of Applied Physics 97, 034102 (2005). (Full Text PDF) J. L. Cohn, M. Peterca, and J. J. Neumeier, Low-temperature permittivity of insulating perovskite manganites, Physical Review B 70, 214433 (2004). (Full Text PDF) G.S. Nolas, J.L. Cohn, J. S. Dyck, C. Uher, G. A. Lamberton, Jr., and T.M. Tritt, Low temperature transport properties of polycrystalline Ba8Ga16Sn30 Journal of Materials Research 19, 3556 (2004). R. Maier and J. L. Cohn, Ferroelectric and ferrimagnetic iron-doped thin-film BaTiO3: Influence of iron on physical properties, Journal of Applied Physics 92, 5429 (2002). (Full Text PDF) J. L. Cohn and J. J. Neumeier, Heat conduction and magnetic phase behavior in electron-doped Ca1-xLaxMnO3 (0< x <0.2), Physical Review B 66, 100404(R) (2002). (Full Text PDF) G. S. Nolas, D. G. Vanderveer, A. P. Wilkinson, and J. L. Cohn, Temperature dependent structural and transport properties of the type II clathrates A8Na16E136 (A = Cs or Rb and E = Ge or Si), Journal of Applied Physics 91, 8970 (2002). (Full Text PDF) G. S. Nolas, J. L. Cohn, J. S. Dyck, C. Uher, and J. Yang Transport properties of polycrystalline type-I Sn clathrates, Physical Review B 65, 165201 (2002). (Full Text PDF) R. Maier, J. L. Cohn, J. J. Neumeier, and L. A. Bendersky, Ferroelectricity and ferrimagnetism in iron-doped BaTiO3, Applied Physics Letters 78, 2356 (2001). (Full Text PDF) J. J. Neumeier and J. L. Cohn, Possible signatures of magnetic phase segregation in electron-doped antiferromagnetic CaMnO3, Physical Review B 61, 14319 (2000). (Full Text PDF) J. L. Cohn, Electrical and Thermal Transport in Perovskite Manganites, Journal of Superconductivity: Incorporating Novel Magnetism 13, 291 (2000). (Full Text PDF) J. L. Cohn, Heat Conduction and Charge Ordering in Perovskite Manganites, Nickelates and Cuprates, Thermal Conductivity 25, Thermal Expansion 13, ed. by C. Uher and D. T. Morelli, (Technomic Publishing, Lancaster, PA, 2000), pp. 87-97. L. A. Bendersky, R. Maier, J. L. Cohn, and J. J. Neumeier, Structural studies of pulsed-laser-deposited Ba4Fe4Ti3O16 oxide films, Journal of Materials Research 15, 1389 (2000). G. S. Nolas, T. J. Weakley, J. L. Cohn, and R. Sharma, Structural properties and thermal conductivity of crystalline Ge clathrates, Physical Review B 61, 3845 (2000). (Full Text PDF) Selection of Papers Prior to 2000
Joshua L. Cohn Lab:
jcohn@miami.edu
Department of Physics
309 Knight Physics Bldg., University of Miami
Coral Gables, FL 33124-5630
(305) 284-7123
University of Miami
Coral Gables, FL 33146
Ph: (305) 284-7135
FAX: (305) 284-4222