Stuart A Calder

Stuart A Calder

Neutron Scattering Scientist



Dr Calder's research focuses on probing the magnetic ground state and inelastic excitations in strongly correlated electron systems using neutron scattering and resonant x-ray scattering. Systems of interest include magnetic semiconducting two-dimensional (2D) layered structures, 5d oxides with strong spin-orbit interactions and geometric frustrated compounds. Particular interest invovles investigating compounds with a coupling of magnetism to further degrees of freedom.

Positions held

Postdoctoral Fellow, Oak Ridge National Laboratory (2010-2013)

Neutron Scattering Scientist, Oak Ridge National Laboratory (2013-present) 


PhD, Physics, University College London, UK (2006-2010).

Thesis title: Investigation of geometric frustration in magnetic oxides.

Master of Physics (MPhys), University of Edinburgh, UK (1999-2004).


American Physical Society

Neutron Scattering Society of America

American Crystallographic Association



1. S. Calder, D. J. Singh, V. O. Garlea, M. D. Lumsden, Y. G. Shi, K. Yamaura, A. D. Christianson, “Interplay of spin-orbit coupling and hybridization in Ca3LiOsO6 and Ca3LiRuO6”. Physical Review B 96, 184426 (2017).
2. A. E. Taylor, S. Calder, R. Morrow, H. L. Feng, M. H. Upton, M. D. Lumsden, K. Yamaura, P. M. Woodward, and A. D. Christianson, “Spin-orbit coupling controlled J = 3/2 electronic ground state in 5d3 oxides”. Physical Review Letters 118, 207202 (2017).
3. M. A. McGuire, J. Yan, P. Lampen-Kelley, A. F. May, V. R. Cooper, L. Lindsay, A. Puretzky, L. Liang, Santosh KC, E. Cakmak, S. Calder and B. C. Sales “High-temperature magnetostructural transition in van der Waals-layered α−MoCl3”. Physical Review Materials 1, 064001 (2017). [Editors’ Suggestion]
4. L. Ge, J. Flynn, J. A. M. Paddison, M. B. Stone, S. Calder, M. A. Subramanian, A. P. Ramirez, and M. Mourigal “Spin order and dynamics in the diamond-lattice Heisenberg antiferromagnets CuRh2O4 and CoRh2O4”, Physical Review B 96, 064413 (2017).
5. S. Calder, J. G. Vale, N. Bogdanov, C. Donnerer, M. Moretti Sala, X. Liu, M. H. Upton, D. Casa, Y. G. Shi, Y. Tsujimoto,11 K. Yamaura, J. P. Hill, J. van den Brink, D. F. McMorrow, and A. D. Christianson, “Strongly Gapped Spin-Wave Excitation in the Insulating Phase of NaOsO3”. Physical Review B: Rapid Communication 95, 020413(R) (2017).
6. M. J. Tarne, M. M. Bordelon, S. Calder, J. R. Neilson, K. A. Ross “Tuning the antiferromagnetic helical pitch length and nanoscale domain size in Fe3PO4O3 by magnetic dilution”, Physical Review B 96, 214431 (2017).
7. P. M. Sarte, A. A. Aczel, G. Ehlers, C. Stock, B. D. Gaulin, C. Mauws, M. B. Stone, S. Calder, S. E. Nagler, J. W. Hollett, H. D. Zhou, J. S. Gardner, J. P. Attfield and C. R. Wiebe, “Evidence for the confinement of magnetic monopoles in quantum spin ice”, Journal of Physics: Condensed Matter 29, 45LT01 (2017).
8. A. F. May, Y. Liu, S. Calder, D. S. Parker, T. Pandey, E. Cakmak, H. Cao, J. Yan and M. A. McGuire “Magnetic order and interactions in ferromagnetic Mn3Si2Te6”, Physical Review B 95, 174440 (2017).
9. R. Sinclair, H. D. Zhou, M. Lee, E. S. Choi, G. Li, T. Hong and S. Calder, “Magnetic ground states and magnetoelectric effect of RCr(BO3)2 (R = Y and Ho)”, Physical Review B 95, 174410 (2017).
10. Zhou, L., Jianhong Dai, Yunyu Yin, Huibo Cao, S. Calder, Xiao Wang, Qing Zhao, Xudong Shen, Junye Yang, Hajime Hojo, Masaki Azuma, Takashi Saito, Yuichi Shimakawa, Young Sun, Changqing Jin, Youwen Long, “Realization of large electric polarization and strong magnetoelectric coupling in BiMn3Cr4O12”. Advanced Materials, 29, 1703435 (2017).
11. T. Ferreira, G. Morrison, W. M. Chance, S. Calder, M. D. Smith, H.-C. zur Loye, “BaFe4O7 and K0.22Ba0.89Fe4O7 – New Canted Antiferromagnetic Diferrites with Exceptionally High Magnetic Ordering Temperatures” Chemistry of Materials 29, 2689 (2017).
12. Ruminy, M., S. Chi, S. Calder, T. Fennell, Microscopic mechanism of spin flipping in the spin ices Dy2Ti2O7 and Ho2Ti2O7. Physical Review B: Rapid Communication 95, 060414(R) (2017).
13. Y. Feng, Y. Wang, A. Palmer, L. Li, D. M. Silevitch, S. Calder, T. F. Rosenbaum, “Multiple superconducting states induced by pressure in Mo3Sb7” Physical Review B 95, 125102 (2017).
14. J. Yi, H. Zhuang, Guixin Cao, Siwei Tang, S. Calder, P. R. C. Kent, D. Mandrus, Z. Gai, “Competing antiferromagnetism in a quasi-2D itinerant ferromagnet: Fe3GeTe2” 2D Materials 4, 011005 (2017).
15. S. Calder, J. G. Vale, N. A. Bogdanov, X. Liu, C. Donnerer, M. H. Upton, D. Casa, A. H. Said, M. D. Lumsden, Z. Zhao, J.-Q. Yan, D. Mandrus, S. Nishimoto, J. van den Brink, J. P. Hill, D. F. McMorrow, and A. D. Christianson, “Spin-orbit-driven magnetic structure and excitation in the 5d pyrochlore Cd2Os2O7”, Nature Communications 7, 11651 (2016).
16. J. Shamblin, S. Calder, Z. Dun, M. Lee, E S. Choi, J. Neuefeind, H. Zhou and M. Lang “Crystal structure and partial Ising-like magnetic ordering of orthorhombic Dy2TiO5”, Physical Review B 94, 024413 (2016).
17. L. Poudel, A. F. May, M. R. Koehler, M. A. McGuire, S. Mukhopadhyay, S. Calder, R. E. Baumbach, R. Mukherjee, D. Sapkota, C. de la Cruz, D. J. Singh, D. Mandrus and A. D. Christianson, “Candidate Elastic Quantum Critical Point in LaCu6-xAux¬”. Physical Review Letters 117, 235701 (2016).
18. S. Calder, J. W. Kim, A. E. Taylor, M. H. Upton, D. Casa, Guixin Cao M. D. Lumsden, and A. D. Christianson, “Strong anisotropy within a Heisenberg model in the Jeff=1/2 insulating state of Sr2Ir0.8Ru0.2O4”. Physical Review B: Rapid Communication 94, 220407(R) (2016).
19. H. L. Feng, S. Calder, M. Prasad Ghimire, Y-H Yuan, Y. Tsujimoto, Y. Matsushita, Z. Hu, C-Y. Kuo, L. Hao, T-W. Pi, Y. Soo, J. He, M. Tanaka, Y. Katsuya, M. Richter, K. Yamaura “Ba2NiOsO6: A possible spin-orbit coupling assisted magnetic semiconductor", Physical Review B 94, 235158 (2016).
20. A. E. Taylor, R. Morrow, R. S. Fishman, S. Calder, A. I. Kolesnikov, M. D. Lumsden, P. M. Woodward, and A. D. Christianson “Spin-orbit coupling controlled ground state in Sr2ScOsO6”, Physical Review B: Rapid Communications 93, 220408(R) (2016).
21. Cui, Q., W. Fan, J.-G. Cheng, A. E. Taylor, S. Calder, M.A. McGuire, J.-Q. Yan, D. Meyers, X. Li, Y. Q. Cai, Y. Y. Jiao, Y. Choi, D. Haskel, H. Gotou, Y. Uwatoko, J. Chakhalian, A. D. Christianson, S. Yunoki, J. B. Goodenough, J.-S. Zhou, Jeff =1/2 Slater insulator in perovskites SrIr1-xSnxO3. Physical Review Letters 117, 176603 (2016).
22. A. F. May, S. Calder, D. Parker, B. C. Sales, and M. A. McGuire, “Competing magnetic ground states and their coupling to the crystal lattice in CuFe¬¬2Ge¬2¬”. Scientific Reports 6, 35325 (2016).
23. A.A. Aczel, A.M. Cook, T.J. Williams, S. Calder, A.D. Christianson, G.-X. Cao, D. Mandrus, Y.B. Kim, A. Paramekanti, “Highly anisotropic exchange interactions of jeff = 1 2 iridium moments on the fcc lattice in La2BIrO6 (B = Mg,Zn).” Physical Review B 93, 214426 (2016). [Editor’s suggestion]
24. Z. Y. Zhao, S. Calder, A.A. Aczel, M. A. McGuire, B. C. Sales, D. G. Mandrus, G. Chen, N. Trivedi, H. D. Zhou and J.-Q. Yan “Fragile singlet ground state magnetism in pyrochlore osmates R2Os2O7 (R = Y and Ho)”, Physical Review B 93, 134426 (2016).
25. A. F. May, S. Calder, C. Cantoni, H. Cao and M. A. McGuire “Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3GeTe2”, Physical Review B 93, 01441 (2016).
26. A. Madiligama, P. Ari-Gur, V. Shavrov, V. Koledov, S. Calder, M. Alexey, A. Kamantsev, E. Dilmieva, L. Gonzalez-Legarreta, B. Hernando, V. Vega, A. Kayani “Crystalline structure and magnetic behavior of the Ni41Mn39In12Co8 alloy demonstrating giant magnetocaloric effect”, Smart Materials and Structures 25, 085013 (2016).
27. A.A. Aczel, Z. Zhao, S. Calder, D.T. Adroja, P.J. Baker, J.-Q. Yan, “Structural and magnetic properties of the 5d2 double perovskites Sr2BReO6 (B = Y, In)”, Physical Review B 93, 214407 (2016).
28. S. Calder, J. H. Lee, M. B. Stone, M. D. Lumsden, J. C. Lang, M. Feygenson, Z. Zhao, J.-Q. Yan, Y. G. Shi, Y. S. Sun, Y. Tsujimoto, K. Yamaura, and A. D. Christianson, “Enhanced spin-phonon-electronic coupling in a 5d oxide”, Nature Communications 6 8916 (2015).
29. S. Calder, L. Li, S. Okamoto, Y. Choi, R. Mukherjee, D. Haskel, D. Mandrus, Spin-orbit driven magnetic insulating state with Jeff=1/2 character in a 4d oxide. Physical Review B:Rapid Communication 92, 180413(R) (2015). [Editors’ Suggestion]
30. A. E. Taylor, R. Morrow, D. J. Singh, S. Calder, M. D. Lumsden, P. M. Woodward, A. D. Christianson “Magnetic order and electronic structure of 5d3 double perovskite Sr2ScOsO6”, Physical Review B: Rapid Communications 91, 100406(R) (2015).
31. S. Calder, J. W. Kim, G.-X. Cao, C. Cantoni, A. F. May, H. Cao, A. A. Aczel, M. Matsuda, Y. Choi, D. Haskel, B. C. Sales, D. Mandrus, M. D. Lumsden, and A. D. Christianson, “Evolution of competing magnetic order in the Jeff=1/2 insulating state of Sr2Ir1−xRuxO4”, Physical Review B 92, 165128 (2015).
32. N. Ghimire, S. Calder M. Janoschek, E. Bauer “Magnetic structure of the antiferromagnetic Kondo lattice compounds CeRhAl4Si2 and CeIrAl4Si2”, Journal of Physics: Condensed Matter 27, 245603 (2015).
33. L. Poudel, C. de la Cruz, E. A. Payzant, A. F. May, M. Koehler, V. O. Garlea, A. E. Taylor, D. S. Parker, H. B. Cao, M. A. McGuire, W. Tian, M. Matsuda, H. Jeen, H. N. Lee, T. Hong, S. Calder, H. D. Zhou, M. D. Lumsden, V. Keppens, D. Mandrus and A. D. Christianson “Structural and Magnetic Phase Transitions in CeCu6−xTx (T = Ag, Pd) ”, Physical Review B 92, 214421 (2015).
34. A. E. Taylor, T. Berlijn, S. E. Hahn, A. F. May, T. J. Williams, L. Poudel, S. Calder, R. S. Fishman, M. B. Stone, A. A. Aczel, H. B. Cao, M. D. Lumsden, and A. D. Christianson “Influence of interstitial Mn on magnetism in room-temperature ferromagnet Mn1+δ Sb”, Physical Review B 91, 224418 (2015).
35. R. Essehli, I. Belharouak, H. Ben Yahia, K. Maher, A. Abouimrane, R. Chamoun, B. Orayech, B. El Bali, S. Calder, X. L. Zhou and Z. Zhouf. “Structural and electrochemical properties of Na2Co2Fe(PO4)3 as electroactive material for sodium ion batteries”, Dalton Transactions 44, 7881 (2015).
36. A. Madiligama, P. AriGur, V. Shavrov, V. Koledov, Y. Ren, S. Calder, A. Kayani, “Effects of cobalt on the crystalline structures of the Ni-Mn-In giant magnetocaloric heusler alloys.” Proceedings of the 2nd International Congress on Energy Efficiency and Energy Related Materials (ENEFM 2014) (2015) pp. 507-514.
37. 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. Lezaic, M. Matsuda, J. Ma, S. Calder, M. Isobe and M.Azuma, “Melting of Pb charge glass and simultaneous Pb-Cr charge transfer in PbCrO3 ” Journal of the American Chemical Society 137 12719 (2015).
38. S. Calder, G.-X. Cao, S. Okamoto, J. W. Kim, V. R. Cooper, Z. Gai, B. C. Sales, M. D. Lumsden, D. Mandrus, A. D. Christianson “Jeff=Mott spin-orbit insulating state close to the cubic limit in Ca4IrO6”, Physical Review B: Rapid Communications 89, 081104(R) (2014).
39. S. Calder, B. Saparov, H. B. Cao, J. L. Niedziela, M. D. Lumsden, A. S. Sefat, A. D. Christianson “Magnetic structure and spin excitations in BaMn2Bi2”, Physical Review B 89, 064417(2014).
40. A. K. Pathak, D. Paudyal, W. T. Jayasekara, S. Calder, A. Kreyssig, A. I. Goldman, K. A. Gschneidner, Jr., and V. K. Pecharsky “Unexpected magnetism, Griffiths phase, and exchange bias in the mixed lanthanide Pr0.6Er0.4Al2’, Physical Review B 89, 224411 (2014).
41. J. 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 “Magnetic and Structural Phase Transitions in the Spinel Compound Fe1+xCr2−xO4”, Physical Review B 89, 134106 (2014).
42. G-X. Cao, S. Alaska, S. Calder, J.-Q. Yan, Jieyu Yi, Z. Gai, L. Poudel, D. J. Singh, M. D. Lumsden, A. D. Christianson, B. C. Sales, D. Mandrus, “Magnetism and electronic structure of La2ZnIrO6 and La2MgIrO6: Candidate Jeff=1/2 Mott insulators”, Physical Review B 87, 2155136 (2013).
43. S. Calder, S. Giblin, D. R. Parker, P. P. Deen, C. Ritter, J. R. Stewart and T. Fennell, “Neutron Scattering and μSR investigations of the Low Temperature State of LuCuGaO4”, Journal of Physics: Condensed Matter 25, 356002 (2013).
44. A. Pramanick, S. O. Diallo, O. Delaire, S. Calder, A. D. Christianson, X.-L. Wang, J. A. Fernandez-Baca, “Origins of large enhancement in electromechanical coupling for nonpolar directions in ferroelectric BaTiO3”, Physical Review B: Rapid Communications 88, 180101(R) (2013).
45. W. Jayasekara, Y. Lee, Abhishek Pandey, G. S. Tucker, A. Sapkota, J. Lamsal, S. Calder, D. L. Abernathy, J. L. Niedziela, B. N. Harmon, A. Kreyssig, D. Vaknin, D. C. Johnston, A. I. Goldman, R. J. McQueeney, “Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2”, Physical Review Letters 111, 157001 (2013).
46. A. D. Christianson, M. D. Lumsden, K. Marty, C. H. Wang, S. Calder, D. L. Abernathy, M. B. Stone, H. A. Mook, M. A. McGuire, A. S. Sefat, B. C. Sales, D. Mandrus, and E. A. Goremychkin, “Doping dependence of the spin excitations in the Fe-based superconductors Fe1+yTe1-xSex”, Physical Review B 87, 224410 (2013).
47. M. G. Kim, G. S. Tucker, D. K. Pratt, S. Ran, A. Thaler, A. D. Christianson, K. Marty, S. Calder, A. Podlesnyak, S. L. Budko, P. C. Canfield, A. Kreyssig, A. I. Goldman, and R. J. McQueeney, “Magnonlike Dispersion of Spin Resonance in Ni-doped BaFe2As2”, Physical Review Letters 110, 177002 (2013).
48. M. Ramazanoglu, J. Lamsal, G. S. Tucker, J.-Q. Yan, S. Calder, T. Guidi, T. Perring, R. W. McCallum, T.A. Lograsso, A. Kreyssig, A.I. Goldman, R.J. McQueeney, “Two-dimensional magnetic interactions in LaFeAsO”. Physical Review B: Rapid Communications 87, 140509(R) (2013).
49. S. Calder, V. O. Garlea, D. F. McMorrow, M. D. Lumsden, M. B. Stone, J. C. Lang, J.-W. Kim, J. A. Schlueter, Y. G. Shi, K. Yamaura, Y. S. Sun, Y. Tsujimoto, A. D. Christianson “Magnetically driven metal-insulator in NaOsO3”, Physical Review Letters 108, 257209 (2012).
50. S. Calder, G.-X. Cao, M. D. Lumsden, J. W. Kim, Z. Gai, B. C. Sales, D. Mandrus, A. D. Christianson “Magnetic structural change of Sr2IrO4 upon Mn doping”, Physical Review B: Rapid Communications 86, 220403(R) (2012).
51. S. Calder, M. D. Lumsden, V. O. Garlea, J.-W. Kim, Y. G. Shi, H. L. Feng, K. Yamaura, and A. D. Christianson “Magnetic structure determination of Ca3LiOsO6 using neutron and x-ray scattering”, Physical Review B 86, 054403 (2012).
52. J. E. Mitchell, B. Saparov, W. Lin, S. Calder, Qi. Li, S. V. Kalinin, M. Pan, A. D. Christianson and A. S. Sefat “Temperature-composition phase diagrams for Ba1−xSrxFe2As2 (0≤x≤1) and superconducting Ba0.5Sr0.5(Fe1−yCoy)2As2 (0≤y≤0.141), Physical Review B 86, 174511 (2012).
53. B. Saparov, S. Calder, B. Sipos, H. Cao, S. Chi, D. J. Singh, A. D. Christianson, M. D. Lumsden, A. S. Sefat “Spin glass and semiconducting behavior in one-dimensional BaFe2−δSe3 (δ ≈ 0.2) crystals”, Physical Review B 84, 245123 (2011).
54. S. Calder, X. Ke, F. Bert, A. Amato, C. Baines, C. Carboni, R. J. Cava, A. Daoud-Aladine, P. Deen, T. Fennell, A. D. Hillier, H. Karunadasa, J. W. Taylor, P. Mendels, P. Schiffer and S. T. Bramwell, “Magnetic properties of Ba2HoSbO6 with a Frustrated Lattice Geometry”, Physical Review B, 81 064425 (2010).
55. S. Calder, T. Fennell, W. Kockelmann, R. J. Cava and S. T. Bramwell, “Neutron Scattering and Crystal Field Studies of the Rare Earth Double Perovskite Ba2ErSbO6” Journal of Physics: Condensed Matter, 22 116007 (2010).
56. S. T. Bramwell, S. R. Giblin, S. Calder, R. Aldus, D. Prabhakaran, T. Fennell, “Measurement of the Charge and Current of Magnetic Monopoles in Spin Ice”, Nature 461, 956 (2009).
57. S. Calder, S. R. Giblin and S. T. Bramwell, “Using μSR as a Magnetometer”, Physica B 404, 1017 (2009).
58. S. R. Giblin, J. D. M. Champion, H. D. Zhou, C. R. Wiebe, J. S. Gardner, I. Terry, S. Calder, T. Fennell, and S. T. Bramwell, “Static Magnetic Order in Tb2Sn2O7 revealed by Muon Spin Relaxation with Exterior Muon Implantation”, Physical Review Letters 101, 237201 (2008).

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