D. Mandrus
State University of New York System
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Featured researches published by D. Mandrus.
Nature | 2008
F. Hunte; J. Jaroszynski; A. Gurevich; D. C. Larbalestier; R. Jin; Athena S. Sefat; Michael A. McGuire; Brian C. Sales; D. K. Christen; D. Mandrus
The recent synthesis of the superconductor LaFeAsO0.89F0.11 with transition temperature Tc ≈ 26 K (refs 1–4) has been quickly followed by reports of even higher transition temperatures in related compounds: 41 K in CeFeAsO0.84F0.16 (ref. 5), 43 K in SmFeAsO0.9F0.1 (ref. 6), and 52 K in NdFeAsO0.89F0.11 and PrFeAsO0.89F0.11 (refs 7, 8). These discoveries have generated much interest in the mechanisms and manifestations of unconventional superconductivity in the family of doped quaternary layered oxypnictides LnOTMPn (Ln: La, Pr, Ce, Sm; TM: Mn, Fe, Co, Ni; Pn: P, As), because many features of these materials set them apart from other known superconductors. Here we report resistance measurements of LaFeAsO0.89F0.11 at high magnetic fields, up to 45 T, that show a remarkable enhancement of the upper critical field Bc2 compared to values expected from the slopes dBc2/dT ≈ 2 T K-1 near Tc, particularly at low temperatures where the deduced Bc2(0) ≈ 63–65 T exceeds the paramagnetic limit. We argue that oxypnictides represent a new class of high-field superconductors with Bc2 values surpassing those of Nb3Sn, MgB2 and the Chevrel phases, and perhaps exceeding the 100 T magnetic field benchmark of the high-Tc copper oxides.
Nature | 2008
F. Hunte; J. Jaroszynski; A. Gurevich; D. C. Larbalestier; R. Jin; Athena S. Sefat; Michael A. McGuire; Brian C. Sales; D. K. Christen; D. Mandrus
The recent synthesis of the superconductor LaFeAsO0.89F0.11 with transition temperature Tc ≈ 26 K (refs 1–4) has been quickly followed by reports of even higher transition temperatures in related compounds: 41 K in CeFeAsO0.84F0.16 (ref. 5), 43 K in SmFeAsO0.9F0.1 (ref. 6), and 52 K in NdFeAsO0.89F0.11 and PrFeAsO0.89F0.11 (refs 7, 8). These discoveries have generated much interest in the mechanisms and manifestations of unconventional superconductivity in the family of doped quaternary layered oxypnictides LnOTMPn (Ln: La, Pr, Ce, Sm; TM: Mn, Fe, Co, Ni; Pn: P, As), because many features of these materials set them apart from other known superconductors. Here we report resistance measurements of LaFeAsO0.89F0.11 at high magnetic fields, up to 45 T, that show a remarkable enhancement of the upper critical field Bc2 compared to values expected from the slopes dBc2/dT ≈ 2 T K-1 near Tc, particularly at low temperatures where the deduced Bc2(0) ≈ 63–65 T exceeds the paramagnetic limit. We argue that oxypnictides represent a new class of high-field superconductors with Bc2 values surpassing those of Nb3Sn, MgB2 and the Chevrel phases, and perhaps exceeding the 100 T magnetic field benchmark of the high-Tc copper oxides.
Physical Review B | 2013
Nirmal Ghimire; Michael A. McGuire; David S. Parker; B. Sipos; S. Tang; Jiaqiang Yan; B. C. Sales; D. Mandrus
The chiral helimagnet Cr1/3NbS2 has been investigated by magnetic, transport and thermal properties measurements on single crystals and by first principles electronic structure calculations. From the measured field and temperature dependence of the magnetization for fields applied perpendicular to the c axis, the magnetic phase diagram has been constructed in the vicinity of the phase transitions. A transition from a paramagnetic to a magnetically ordered phase occurs near 120 K. With increasing magnetic field and at temperatures below 120 K, this material undergoes transitions from a helimagnetic to a soliton-lattice phase near 900 Oe, and then to a ferromagnetic phase near 1300 Oe. The transitions are found to strongly affect the electrical transport. The resistivity decreases sharply upon cooling near 120 K, and the spin reorientation from the helimagnetic ground state to the commensurate ferromagnetic state is evident in the magnetoresistance. At high fields a large magnetoresistance (55 % at 140 kOe) is observed near the magnetic transition temperature. Heat capacity and electronic structure calculations show the density of states at the Fermi level is low in the magnetically ordered state. Effects of spin fluctuations are likely important in understanding the behavior of Cr1/3NbS2 near and above the magnetic ordering transitions.
Physical Review B | 2017
A. N. Ponomaryov; E. Schulze; J. Wosnitza; P. Lampen-Kelley; Arnab Banerjee; Jiaqiang Yan; Craig A. Bridges; D. Mandrus; S. E. Nagler; A. K. Kolezhuk; S. A. Zvyagin
The honeycomb-lattice material
Physical Review B | 2013
Huibo Cao; Bryan C. Chakoumakos; Jiaqiang Yan; Haidong Zhou; Radu Custelcean; D. Mandrus; Michael A. McGuire; David J. Singh; Xin Chen; Hui Yang
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Nature Communications | 2016
Maxim Ziatdinov; Arnab Banerjee; Artem Maksov; Tom Berlijn; Wu Zhou; Huibo Cao; Jiaqiang Yan; Craig A. Bridges; D. Mandrus; Stephen E Nagler; Arthur P. Baddorf; Sergei V. Kalinin
-RuCl
Physical Review B | 2015
Wei Tian; Chris Svoboda; Masayuki Ochi; Masaaki Matsuda; Huibo Cao; Jinguang Cheng; B. C. Sales; D. Mandrus; Ryotaro Arita; Nandini Trivedi; Jiaqiang Yan
{}_{3}
Physical Review B | 2015
T. J. Williams; A. A. Aczel; M. D. Lumsden; Stephen E Nagler; Matthew Stone; Jiaqiang Q. Yan; D. Mandrus
is a prime candidate for exhibiting Kitaev spin-liquid physics. Here, the authors employ high-field electron spin resonance spectroscopy to probe its spin dynamics across different regions of the phase diagram. Apart from two modes of antiferromagnetic resonance in the zigzag-ordered phase, a rich excitation spectrum was observed in the field-induced quantum disordered state. The authors compare their observations with results of recent numerical calculations, revealing a complex multiparticle nature of magnetic excitations in the field-induced phase.
Physical Review B | 2013
Guixin Cao; Alaska Subedi; Stuart Calder; Jiaqiang Yan; Jieyu Yi; Zheng Gai; L. Poudel; David J. Singh; M. D. Lumsden; A. D. Christianson; Brian C. Sales; D. Mandrus
We used x-ray and neutron diffraction to determine the low-temperature structure of IrTe
Physical Review B | 1992
D. Mandrus; László Forró; Christopher A. Kendziora; L. Mihaly
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