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Costel R Rotundu

SIMES/ SLAC/ Stanford University, Menlo Park, CA, USA

Institution web page: http://simes.stanford.edu/
Personal web page: http://stanford.edu/~rotundu/
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Born: 1974

Interests: strongly correlated electron systems: high temperature superconductivity (HTSc), heavy fermions, superconductors, low dimensional quantum magnets

Details:
High temperature superconductivity (HTSc): cuprate and iron pnictide, heavy fermions, low dimension quantum magnets, semiconductors, semiconductors

- synthesis and characterization (structural and chemical);
- physical properties measurements: low temperature/high magnetic field/high pressure resistivity, heat capacity, magnetization, neutron and X-ray scattering.

Selected publications:
• C. Jozwiak, J. A. Sobota, K. Gotlieb, A. F. Kemper, C. R. Rotundu, R. J. Birgeneau, Z. Hussain, D. -H. Lee, Z. -X. Shen, and A. Lanzara. Spin-polarized surface resonances accompanying topological surface state formation. Nature Communications, 7, p. 13143, 2016.
• T R Forrest, P N Valdivia, C R Rotundu, E Bourret-Courchesne and R J Birgeneau. The effects of post-growth annealing on the structural and magnetic properties of BaFe2As2. Journal of Physics: Condensed Matter, 28, p. 115702, 2016.
• Costel R. Rotundu, Thomas R. Forrest, Norman E. Phillips, and Robert J. Birgeneau. Specific heat of Ba0. 59K0. 45Fe2As2, and a new method for identifying the electron contribution: two electron bands with different energy gaps in the superconducting state. Journal of the Physical Society of Japan, 84, p. 114701, 2015.
• Costel R. Rotundu, Shan Jiang, Xiaoyu Deng, Yiting Qian, Saeed Khan, David G. Hawthorn, Gabriel Kotliar and Ni Ni. Physical properties and electronic structure of a new barium titanate suboxide Ba1+dTi13-dO12 (d = 0. 11). APL Materials, 3, p. 041517, 2015.
• C. R. Rotundu, T. Cuk, R. L. Greene, Z. -X. Shen, Russell J. Hemley, and V. V. Struzhkin. High-pressure resistivity technique for quasi-hydrostatic compression experiments. Review of Scientific Instruments, 84, p. 063903, 2013.
• C. R. Rotundu. Comment on “Retention of the Tetragonal to Orthorhombic Structural Transition in F-Substituted SmFeAsO: A New Phase Diagram for SmFeAs(O1-xFx)”. Physical Review Letters, 110, p. 209701, 2013.
• C. Jozwiak, C. -H. Park, K. Gotlieb, D. -H. Lee, S. G. Louie, J. D. Denlinger, C. R. Rotundu, R. J. Birgeneau, Z. Hussain, and A. Lanzara. Photoelectron spin-flipping and texture manipulation realized in a topological insulator. Nature Physics, 9, p. 293, 2013.
• D. M. Pajerowski, C. R. Rotundu , J. W. Lynn, R. J. Birgeneau. Measurement of Ba(Fe1-xCox)2As2 critical-magnetic exponents for x = 0. 039, 0. 022, and 0. 021. Physical Review B, 87, p. 134507, 2013.
• J. Zhao, C. R. Rotundu, K. Marty, M. Matsuda, Y. Zhao, C. Setty, E. B. -C., J. Hu, D. -H. Lee, and R. J. Birgeneau. Effect of electron correlations on the spin excitations in isovalently doped iron based superconductor Ba(Fe1-xRux)2As2. Physical Review Letters, 110, p. 147003, 2013.
• C. R. Rotundu, V. V. Struzhkin, M. S. Somayazulu, S. Sinogeikin, Russell J. Hemley, and R. L. Greene. High-pressure effects on single crystals of electron-doped Pr2-xCexCuO4. Physical Review B, 87, p. 024506, 2013.
• C. R. Rotundu , W. Tian, K. C. Rule, T. R. Forrest, J. Zhao, J. L. Zarestky, and R. J. Birgeneau. A neutron scattering study of the under-doped Ba1-xKxFe2As2, x=0. 09 and 0. 17 self-flux grown single crystals and the universality of the tricritical point. Physical Review B, 85, p. 144506, 2012.
• Journal of Applied Physics. Low temperature transport properties of Ce-Al metallic glasses. , 109, p. 113716, 2011.
• H. Tsujii, C. R. Rotundu, B. Andraka, Y. Takano, H. Kageyama, and Y. Ueda. Specific heat of the S=1/2 two-dimensional Shastry-Sutherland antiferromagnet SrCu2(BO3)2 in high magnetic fields. Journal of the Physical Society of Japan, 80, p. 043707, 2011.
• C. Jozwiak, Y. L. Chen, A. V. Fedorov, J. G. Analytis, C. R. Rotundu, A. K. Schmid, J. D. Denlinger, Y. -D. Chuang, D. -H. Lee, I. R. Fisher, R. J. Birgeneau, Z. X. Shen, Z. Hussain, and A. Lanzara. Widespread spin polarization effects in photoemission from topological insulators. Physical Review B, 84, p. 165113, 2011.
• B. Andraka, A. Ross, and C. R. Rotundu. Signatures of a hybridization gap in magnetic susceptibility of Ce1-xLaxOs4Sb12. Journal of Physics: Condensed Matter, 23, p. 405601, 2011.
• C R Rotundu and R J Birgeneau. First and second order magnetic and structural phase transitions in BaFe2(1-x)Co2xAs2. Physical Review B, 84, p. 092501, 2011.
• C R Rotundu, B Freelon, S D Wilson, G Pinuellas, A Kim, E. Bourret-Courchesne, N E Phillips, and R J Birgeneau. Heat capacity of Ba1-xKxFe2As2, x=0 and 0. 41. Journal of Physics: Conference Series , 273, p. 012103, 2011.
• B Freelon, Y S Liu, Y Liu, C R Rotundu, S D Wilson, J H Guo, J Chen, W Yang, C L Chang, P A Glans, P M Shirage, A Iyo, and R J Birgeneau. Electronic structure of PrFeAsO1-d: An investigation using X-ray absorption and emission spectroscopy. Journal of Physics: Conference Series, 273, p. 012092, 2011.
• C R Rotundu, B Freelon, T R Forrest, S D Wilson, P N Valdivia, G Pinuellas, A Kim, J-W Kim, Z Islam, E Bourret-Courchesne, N E Phillips, and R J Birgeneau. Heat capacity study of BaFe2As2: Effects of annealing. Physical Review B, 82, p. 144525, 2010.
• L Kilanski, M Górska, W Dobrowolski, E Dynowska, M Wójcik, B J Kowalski, J R Anderson, C R Rotundu, D K Maude, S A Varnavskiy, I V Fedorchenko, and S F Marenkin. Magnetism and magnetotransport of strongly disordered Zn1-xMnxGeAs2 semiconductor: The role of nanoscale magnetic clusters. Journal of Applied Physics, 108, p. 073925, 2010.
• S D Wilson, Z Yamani, C R Rotundu, B Freelon, P N Valdivia, E Bourret-Courchesne, J W Lynn, Songxue Chi, Tao Hong, and R J Birgeneau. Antiferromagnetic critical fluctuations in BaFe2As2. Physical Review B, 82, p. 144502, 2010.
• Byron Freelon, Yi-sheng Liu, Costel R. Rotundu, Stephen D. Wilson, Jinghua Guo, Jeng-Lung Chen, Wanli Yang, Chunli Chang, Per Anders Glans, Parasharam Shirage, Akira Iyo, and Robert J. Birgeneau. X-ray Absorption and Emission Spectroscopy Study of the Effect of Doping on the Low Energy Electronic Structure of PrFeAsO1-d. Journal of the Physical Society of Japan, 79, p. 074716, 2010.
• B Andraka, C R Rotundu, P Kumar, and H Tsujii. Investigation of heavy fermion state and superconductivity in Pr1-xLaxOs4Sb12 by the upper critical field slope at Tc, . Journal of Physics: Condensed Matter, 22, p. 345701, 2010.
• B Andraka, C R Rotundu, and K Ingersent. Search for heavy quasiparticles in the resistivity of PrOs4Sb12 in magnetic fields: Comparison with Pr0. 7La0. 3Os4Sb12. Physical Review B, 81, p. 054509, 2010.
• B Andraka, M E McBriarty, C R Rotundu. Low-temperature anomalies in the specific heat of PrOs4Sb12. Physical Review B, 81, p. 024517, 2010.
• S D Wilson, C R Rotundu, Z Yamani, P N Valdivia, B Freelon, E Bourret-Courchesne and R J Birgeneau. Universal magnetic and structural behaviors in the iron pnictides. Physical Review B, 81, p. 014501, 2010.
• C R Rotundu, D T Keane, B Freelon, S D Wilson, A Kim, P N Valdivia, E Bourret-Courchesne, and R J Birgeneau. Phase diagram of the PrFeAsO_{1-x}F_{x} superconductor. Physical Review B, 80, p. 144517, 2009.
• S. D. Wilson, Z. Yamani, C. R. Rotundu, B. Freelon, E. Bourret-Courchesne, and R. J. Birgeneau. Neutron diffraction study of the magnetic and structural phase transitions in BaFe2As2. Physical Review B, 79, p. 184519, 2009.
• D R Garcia, C Jozwiack, C G Hwang, A Fedorov, S M Hanrahan, S D Wilson, C R Rotundu, B K Freelon, R J Birgeneau, E Bourret-Courchesne and A Lanzara. Core-level and valence band study using angle-integrated photoemission on LaO0. 9F0. 1FeAs. Physical Review B, 78, p. 245119, 2008.
• B Andraka, C R Rotundu, K Ingersent, and P Schlottmann. Resistivity and magnetoresistance of La-doped CeOs4Sb12 and PrOs4Sb12. Journal of the Physics Society of Japan, 77, Sup. A, p. 148, 2008.
• M Hagiwara, H Tsujii, C R Rotundu, B Andraka, Y Takano, T Suzuki, and S Suga. Field Induced Tomonaga-Luttinger liquid of a quasi-one-dimensional S=1 antiferromagnet. Modern Physics Letters B, 21, No 16, p. 965, 2007.
• H Tsujii, C R Rotundu, T Ono, H Tanaka, B Andraka, K Ingersent, and Y Takano. Thermodynamics of the up-up-down phase of the S=1/2 triangular-lattice antiferromagnet Cs2CuBr4. Physical Review B, 76, p. 060406(R), 2007.
• C R Rotundu, B Andraka, and P Schlottmann. Exotic Kondo-hole band resistivity and magnetoresistance of Ce1-xLaxOs4Sb12 alloys. Physical Review B, 76, p. 054416, 2007.
• C R Rotundu, K Ingersent, and B Andraka. Magnetoresistance of Pr1-xLaxOs4Sb12: disentangling local cristalline-electric-field physics and lattice effects. Physical Review B, 75, p. 104504, 2007.
• C R Rotundu and B Andraka. Crystalline Electric Field Effects in Pr1-xLaxOs4Sb12. AIP Conference Proceedings, 850, p. 653, 2006.
• M Hagiwara, H Tsujii, C R Rotundu, B Andraka, and Y Takano. Evidence for a Tomonaga-Luttinger phase in a S=1 bond-alternating antiferromagnetic chain. AIP Conference Proceedings, 850, p. 1043, 2006.
• H Tsujii, C R Rotundu, T Ono, B Andraka, H Tanaka and Y Takano. Magnetic phase diagram of the quasi-two-dimensional S=1/2 antiferromagnet Cs2CuBr4. AIP Conference Proceedings, 850, p. 1093, 2006.
• M Hagiwara, H Tsujii, C R Rotundu, B Andraka, Y Takano, N Tateiwa, T C Kobayashi, T Suzuki, and S Suga. Tomonaga-Luttinger liquid in a quasi-one-dimensional S=1 antiferromagnet observed by specific heat measurements. Physical Review Letters, 96, p. 147203, 2006.
• C R Rotundu and B Andraka. La-alloying study of CeCoGe2: Magnetic susceptibility and specific heat measurements. Physical Review B, 74, p. 224423, 2006.
• M Hagiwara, H Tsujii, C R Rotundu, B Andraka, Y Takano, N Tateiwa, T C Kobayashi, T Suzuki, and S Suga. Tomonaga-Luttinger Liquid in a Quasi-One-Dimensional S=1. Physical Review Letters, 96, p. 147203, 2006.
• C R Rotundu and B Andraka. Anomalous low-temperature state of a possible Kondo semimetal CeOs4Sb12: Magnetic field and La impurity study. Physical Review B, 73, p. 144429, 2006.
• C R Rotundu, P Kumar, and B Andraka. A Collective Heavy Fermion State and Superconductivity in Pr1-xLaxOs4Sb12: Specific Heat and Susceptibility Study. Physical Review B, 73, p. 014515, 2006.
• R Pietri, C R Rotundu, B Andraka, B Daniels, and K Ingersent. Absence of Kondo lattice coherence effects in Ce0. 6La0. 4Pb3: magnetic field study. Journal of Applied Physics, 95, p. 10A510, 2005.
• C R Rotundu, B Andraka, Z Fisk, G R Stewart, and Y Takano. Magnetic field study of the " hidden order" in UCd11. Journal of Applied Physics, 97, p. 10A912, 2005.
• C R Rotundu and B Andraka. Magnetoresistance of PrOs4Sb12: Evidence for heavy fermion behavior. Journal of Applied Physics, 97, p. 10A927, 2005.
• H Tsujii, C R Rotundu, Y Takano, B Andraka, Y Aoki, H Sugawara, and H Sato. High field phase diagram of PrOs4Sb12. Journal of Magnetism and Magnetic Materials, 272-276, p. 173, 2004.
• C R Rotundu, D Mixson, G R Stewart, and B Andraka. Specific heat of U1-xYxRu2Si2; 0< x< 0. 5: search for a hidden order. Journal of Magnetism and Magnetic Materials, 272-274, pp. e123-e124, 2004.
• C R Rotundu, H Tsujii, Y Takano, B Andraka, H Sugawara, Y Aoki, and H Sato. High magnetic field phase diagram of PrOs4Sb12. Physical Review Letters, 92, p. 037203, 2004.


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