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Chromium at high pressures: Weak coupling and strong fluctuations in an itinerant antiferromagnet

Jaramillo, R. and Feng, Yejun and Lang, J. C. and Islam, Z. and Srajer, G. and Rønnow, H. M. and Littlewood, P. B. and Rosenbaum, T. F. (2008) Chromium at high pressures: Weak coupling and strong fluctuations in an itinerant antiferromagnet. Physical Review B, 77 (18). Art. No. 184418. ISSN 1098-0121. doi:10.1103/PhysRevB.77.184418.

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The spin- and charge-density-wave order parameters of the itinerant antiferromagnet chromium are directly measured with nonresonant x-ray diffraction as the system is driven toward its quantum critical point with high pressure using a diamond anvil cell. The exponential decrease of the spin and charge diffraction intensities with pressure confirms the harmonic scaling of spin and charge, while the evolution of the incommensurate ordering vector provides important insight into the difference between pressure and chemical doping as means of driving quantum phase transitions. Measurement of the charge density wave over more than two orders of magnitude of diffraction intensity provides the clearest demonstration to date of a weakly coupled BCS-type ground state. Evidence for the coexistence of this weakly coupled ground state with high-energy excitations and pseudogap formation above the ordering temperature in chromium, the charge-ordered perovskite manganites, and the blue bronzes, among other such systems, raises fundamental questions about the distinctions between weak and strong coupling.

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Feng, Yejun0000-0003-3667-056X
Additional Information:© 2008 The American Physical Society. (Received 26 February 2008; revised manuscript received 11 April 2008; published 15 May 2008) We are grateful to J. Pluth for invaluable assistance with sample preparation, to C. Rüegg for his contributions to the neutron diffraction work, to G. Aeppli and E. Isaacs for enlightening discussions, and to Junfeng Wang for generously sharing his transport data on the blue bronzes. The work at the University of Chicago was supported by NSF Grant No. DMR-0534296. R.J. acknowledges support from the NSF Graduate Research Foundation. We acknowledge technical support from Vitali Prakapenka at GeoSoilEnviroCARS �Sector 13�, Advanced Photon Source �APS�, Argonne National Laboratory. GeoSoilEnviroCARS is supported by the National Science Foundation—Earth Sciences �Grant No. EAR-0622171� and U.S. Department of Energy— Geosciences �Grant No. DE-FG02-94ER14466�. Use of APS is supported by the U.S. DOE-BES under Contract No. NE-AC02-06CH11357.
Funding AgencyGrant Number
NSF Graduate Research FellowshipUNSPECIFIED
Department of Energy (DOE)DE-FG02-94ER14466
Department of Energy (DOE)NE-AC02-06CH11357
Issue or Number:18
Classification Code:PACS numbers: 74.62.Fj, 64.70.Tg, 75.30.Fv, 78.70.Ck
Record Number:CaltechAUTHORS:20140707-163026508
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46937
Deposited By: George Porter
Deposited On:09 Jul 2014 21:59
Last Modified:10 Nov 2021 17:31

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