Phone: Address: Department of Physics and Astronomy, Shanghai Jiaotong University
Related Links:
Area of Physics: Condensed Matter Physics
Research Interests:
1) Thermoelectric materials
2) Geometrically frustrated magnets
3) Low-dimensional magnetic system
4) Multiferroicity and transition-metal oxides
5) Superconductor
6) Neutron and X-ray scattering
Biographical Sketch:
Selected Publications:
Melting of Pb charge glass and simultaneous Pb-Cr charge transfer in PbCrO3 as the originof volume collapse, R. Yu, M. Mizumaki, T. Watanuki, T. Mizokawa, K. Oka, H. Hojo, H. Kim, A. Machida, K. Sakaki, Y. Nakamura, A. Agui, D. Mori, Y. Inaguma, M. Schlipf, K. Z. Rushchanskii, M. Ležaić, M. Matsuda, J. Ma, S. Calder, M. Isobe and M. Azuma, Journal of the American Chemical Society137,12719 (2015)
Discovery of a Weyl Fermion semimetal and topological Fermi arcs, Su-Yang Xu, Ilya Belopolski, Nasser Alidoust, Madhab Neupane, Guang Bian, Chenglong Zhang, Raman Sankar, Guoqing Chang, Zhujun Yuan, Chi-Cheng Lee, Shin-Ming Huang, Hao Zheng, Jie Ma, Daniel S Sanchez, BaoKai Wang, Arun Bansil, Fangcheng Chou, Pavel P Shibayev, Hsin Lin, Shuang Jia, M Zahid Hasan, Science349, 613 (2015)
Strong competition between orbital-ordering and itinerancy in a frustrated spinel vanadate, J. Ma, J. H. Lee, S. E. Hahn, Tao Hong, H. B. Cao, A. A. Aczel, Z. L. Dun, M. B. Stone, W. Tian, Y. Qiu, J. R. D. Copley, H. D. Zhou, R. S. Fishman, and M. Matsuda, Physical Review B 91, 020407(R) (2015)
Neutron Scattering Investigation of Phonon Scattering Rates in Ag1-xSb1+xTe2+x (x =0, 0.1, and 0.2) investigated with inelastic neutron scattering and synchrotron diffraction, J. Ma, O. Delaire, E. D. Specht, A. F. May, O. Gourdon, J. D. Budai, M. A. McGuire, T. Hong, D. L. Abernathy, G. Ehlers, and E. Karapetrova, Physical Review B 90, 134303 (2014)
Magnetic and Structural Phase Transitions in the Frustrated Spinel Compound Spinel Fe1+xCr2-xO4J. Ma, V. O. Garlea, A. Rondinone, A. A. Aczel, S. Calder, C. dela Cruz, R. Sinclair, W. Tian, Songxue Chi, A. Kiswandhi, J. S. Brooks, H. D. Zhou, and M. Matsuda, Physical Review B 89, 134106 (2014)
Phonon self-energy and origin of anomalous neutron scattering spectra in SnTe and PbTe thermoelectric, C.W. Li, O. Hellman, J. Ma, A.F. May, H. Cao, X. Chen, A.D. Christianson, G. Ehlers, D.J. Singh, B.C. Sales, and O. Delaire, Physical Review Letters 112, 175501 (2014)
Glass-like phonon scattering from spontaneous nanostructure in AgSbTe2, J. Ma, O. Delaire, A. F. May, C. E. Carlton, M. A. McGuire, L. H. VanBebber, D. L. Abernathy, G. Ehlers, Tao Hong, A. Huq, Wei Tian, V. M. Keppens, Y. Shao-Horn, and B. C. Sales, Nature Nanotechnology 8, 445–451(2013)
Magnetic Phase Transition in the Low Dimensional Compound BaMn2Si2O7, J. Ma, C. D. Dela Cruz, Tao Hong, W. Tian, A. A. Aczel, Songxue Chi, J.-Q. Yan, H. D. Zhou, and M. Matsuda, Physical Review B 88, 144405 (2013)
Giant anharmonic phonon scattering in PbTe, O. Delaire, J. Ma, K. Marty, A. F. May, M. A. McGuire, M-H. Du, D. J. Singh, A. Podlesnyak, G. Ehlers, M. D. Lumsden, and B. C. Sales, Nature Materials 10, 614 (2011)
Role of Magnetic Exchange Energy on Charge Ordering in R1/3Sr2/3FeO3(R = La, Pr, and Nd), J. Ma, J.-Q. Yan, S. O. Diallo, R. Stevens, A. Llobet, F. Trouw, D. L. Abernathy, M. B. Stone, and R. J. McQueeney, Physical Review B 84, 224115 (2011)
Stabilization of Charge Ordering in La1/3Sr2/3FeO3-δ by Magnetic Exchange, R. J. McQueeney, J. Ma, S. Chang, J.-Q. Yan, M. Hehlen, and F. Trouw, The magnetic exchange energies in charge ordered La1/3Sr2/3FeO3-δ (LSFO) and its parent compound LaFeO3 (LFO) have been determined by inelastic neutron scattering. In LSFO, the measured ratio of ferromagnetic exchange between Fe3+-Fe5+ pairs (JF) and antiferromagnetic exchange between Fe3+-Fe3+ pairs (JAF) fulfills the criterion for charge ordering driven by magnetic interactions (|JF/JAF|>1). The 30% reduction of JAF as compared to LFO indicates that doped holes are delocalized, and charge ordering occurs without a dominant influence from Coulomb interactions.Physical Review Letters 98, 126402 (2007)