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Dive into the research topics where P. N. Valdivia is active.

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Featured researches published by P. N. Valdivia.


Physical Review B | 2009

Phase diagram of the PrFeAsO1 xFx superconductor

C. R. Rotundu; Denis T. Keane; Byron Freelon; Stephen D. Wilson; A. Kim; P. N. Valdivia; Edith Bourret-Courchesne; R. J. Birgeneau

The electronic phase diagram of


Physical Review B | 2009

Phase diagram of thePrFeAsO1−xFxsuperconductor

C. R. Rotundu; Denis T. Keane; Byron Freelon; Stephen D. Wilson; A. Kim; P. N. Valdivia; Edith Bourret-Courchesne; R. J. Birgeneau

{\text{PrFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}


Physical Review B | 2010

Heat capacity study ofBaFe2As2: Effects of annealing

C. R. Rotundu; Byron Freelon; Thomas Forrest; Stephen D. Wilson; P. N. Valdivia; Giovanni Pinuellas; A. Kim; Jong-Woo Kim; Z. Islam; Edith Bourret-Courchesne; Norman E. Phillips; R. J. Birgeneau


Physical Review B | 2010

Universal magnetic and structural behaviors in the iron arsenides

Stephen D. Wilson; C. R. Rotundu; Z. Yamani; P. N. Valdivia; Byron Freelon; Edith Bourret-Courchesne; R. J. Birgeneau

(0\ensuremath{\le}x\ensuremath{\le}0.225)


Physical Review B | 2016

Experimental elucidation of the origin of the ‘double spin resonances’ in Ba(Fe1−xCox)2As2

Meng Wang; Ming Yi; Hai-Lin Sun; P. N. Valdivia; M. G. Kim; Z. J. Xu; Tom Berlijn; A. D. Christianson; Songxue Chi; M. Hashimoto; D. H. Lu; Xingyuan Li; Edith Bourret-Courchesne; Pengcheng Dai; Dung-Hai Lee; T. A. Maier; R. J. Birgeneau

has been determined using synchrotron x-ray powder-diffraction, magnetization, and resistivity measurements. The structural transition temperature is suppressed from 154 to


Physical Review B | 2012

Magnetic order tuned by Cu substitution in Fe1.1–zCuzTe

Jinsheng Wen; Z. Xu; Guangyong Xu; M. D. Lumsden; P. N. Valdivia; Edith Bourret-Courchesne; Genda Gu; Dung-Hai Lee; J. M. Tranquada; Robert J. Birgeneau

\ensuremath{\approx}120\text{ }\text{K}


Physical Review B | 2014

Two spatially separated phases in semiconducting Rb0.8Fe1.5S2

Meng Wang; Wei Tian; P. N. Valdivia; Songxue Chi; Edith Bourret-Courchesne; Pengcheng Dai; R. J. Birgeneau

and the magnetic phase transitions of both iron and praseodymium ions are completely suppressed by


Physical Review B | 2015

Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity

M. G. Kim; Miaoyin Wang; Gregory S. Tucker; P. N. Valdivia; D. L. Abernathy; Songxue Chi; A. D. Christianson; A. A. Aczel; Tao Hong; T. W. Heitmann; Sheng Ran; P. C. Canfield; Edith Bourret-Courchesne; A. Kreyssig; Dung-Hai Lee; A. I. Goldman; R. J. McQueeney; R. J. Birgeneau

x\ensuremath{\approx}0.08


Journal of Physics: Condensed Matter | 2016

The effects of post-growth annealing on the structural and magnetic properties of BaFe2As2

T R Forrest; P. N. Valdivia; C. R. Rotundu; Edith Bourret-Courchesne; R. J. Birgeneau

fluorine doping, coinciding with the emergence of superconductivity. The optimal doping is


Physical Review B | 2015

Spin Waves and Spatially Anisotropic Exchange Interactions in the S = 2 Stripe Antiferromagnet Rb0.8Fe1.5S2

Meng Wang; P. N. Valdivia; Ming Yi; J. X. Chen; Wenliang Zhang; R. A. Ewings; T. G. Perring; Yang Zhao; Leland Harriger; Jeffrey W. Lynn; Edith Bourret-Courchesne; Pengcheng Dai; Dung-Hai Lee; Dao-Xin Yao; R. J. Birgeneau

x\ensuremath{\approx}0.15

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Edith Bourret-Courchesne

Lawrence Berkeley National Laboratory

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C. R. Rotundu

Lawrence Berkeley National Laboratory

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Byron Freelon

University of California

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Dung-Hai Lee

University of California

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Meng Wang

Chinese Academy of Sciences

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Songxue Chi

Oak Ridge National Laboratory

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A. Kim

University of California

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