02182nas a2200301   4500008004500000020001400045245011000059210006900169260000800238300000600246490000800252520133400260653002201594653001201616100001801628700001201646700001701658700001401675700001801689700001701707700001901724700002001743700002101763700001401784700001901798700001401817856004901831       2020                        Engldsh    a2469-995000aLinear dichroism infrared resonance in overdoped, underdoped, and optimally doped cuprate superconductors0 aLinear dichroism infrared resonance in overdoped underdoped and   cAug  a60 v1023 a<p>By measuring the polarization changes in terahertz, infrared, and visible radiation over an extended energy range (3-2330 meV), we observe symmetry breaking in cuprate high-temperature superconductors over wide energy, doping, and temperature ranges. We measure the polarization rotation (Re[theta(F)]) and ellipticity (Im[theta(F)]) of transmitted radiation through thin films as the sample is rotated. We observe a twofold rotational symmetry in theta(F), which is associated with linear dichroism (LD) and occurs when electromagnetic radiation polarized along one direction is absorbed more strongly than radiation polarized in the perpendicular direction. Such polarization anisotropies can be generally associated with symmetry breakings. We measure the amplitude of the LD signal and study its temperature, energy, and doping dependence. The LD signal shows a resonant behavior with a peak in the few hundred meV range, which is coincident with the midinfrared optical feature that has been associated with the formation of the pseudogap state. The strongest LD signal is found in underdoped films, although it is also observed in optimally and overdoped samples. The LD signal is consistent with an electronic nematic order which is decoupled from the crystallographic axes as well as novel magnetoelectric effects.</p>10aMaterials Science10aPhysics1 aMukherjee, A.1 aSeo, J.1 aArik, M., M.1 aZhang, H.1 aZhang, C., C.1 aKirzhner, T.1 aGeorge, D., K.1 aMarkelz, A., G.1 aArmitage, N., P.1 aKoren, G.1 aWei, J., Y. T.1 aCerne, J.  uhttps://markelz.physics.buffalo.edu/node/23809915nas a2200181   4500008004100000245006500041210006300106490000700169520935100176100001909527700002009546700001909566700002109585700001909606700002109625700002009646856006709666       1991                        eng d00aSite-selective oxygen-isotope substitution in YBa2Cu3O7−δ0 aSiteselective oxygenisotope substitution in YBa2Cu3O7−δ0 v443 a<p>We report selective substitution of oxygen-18 and oxygen-16 isotopes into the inequivalent oxygen lattice sites in <span class="aps-inline-formula"><span id="MathJax-Element-4-Frame" class="mjx-chtml MathJax_CHTML" style="font-size: 107%;"><span id="MJXc-Node-27" class="mjx-math"><span id="MJXc-Node-28" class="mjx-mrow"><span id="MJXc-Node-29" class="mjx-mrow"><span id="MJXc-Node-30" class="mjx-msub"><span class="mjx-base"><span id="MJXc-Node-31" class="mjx-mrow"><span id="MJXc-Node-32" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">YBa</span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-33" class="mjx-mrow"><span id="MJXc-Node-34" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">2</span></span></span></span></span></span></span></span></span></span><span class="aps-inline-formula"><span id="MathJax-Element-5-Frame" class="mjx-chtml MathJax_CHTML" style="font-size: 107%;"><span id="MJXc-Node-35" class="mjx-math"><span id="MJXc-Node-36" class="mjx-mrow"><span id="MJXc-Node-37" class="mjx-mrow"><span id="MJXc-Node-38" class="mjx-msub"><span class="mjx-base"><span id="MJXc-Node-39" class="mjx-mrow"><span id="MJXc-Node-40" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">Cu</span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-41" class="mjx-mrow"><span id="MJXc-Node-42" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">3</span></span></span></span></span></span></span></span></span></span><span class="aps-inline-formula"><span id="MathJax-Element-6-Frame" class="mjx-chtml MathJax_CHTML" style="font-size: 107%;"><span id="MJXc-Node-43" class="mjx-math"><span id="MJXc-Node-44" class="mjx-mrow"><span id="MJXc-Node-45" class="mjx-mrow"><span id="MJXc-Node-46" class="mjx-msub"><span class="mjx-base"><span id="MJXc-Node-47" class="mjx-mrow"><span id="MJXc-Node-48" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">O</span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.242em; padding-right: 0.071em;"><span id="MJXc-Node-49" class="mjx-mrow"><span id="MJXc-Node-50" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">7</span></span><span id="MJXc-Node-51" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.27em; padding-bottom: 0.404em;">−</span></span><span id="MJXc-Node-52" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.471em; padding-bottom: 0.27em; padding-right: 0.007em;">δ</span></span></span></span></span></span></span></span></span></span>. The technique involves gas-phase diffusion and exploits the site dependence of diffusion rates. The <span class="aps-inline-formula"><span id="MathJax-Element-7-Frame" class="mjx-chtml MathJax_CHTML" style="font-size: 107%;"><span id="MJXc-Node-53" class="mjx-math"><span id="MJXc-Node-54" class="mjx-mrow"><span id="MJXc-Node-55" class="mjx-mrow"><span id="MJXc-Node-56" class="mjx-msub"><span class="mjx-base"><span id="MJXc-Node-57" class="mjx-mrow"><span id="MJXc-Node-58" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">CuO</span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-59" class="mjx-mrow"><span id="MJXc-Node-60" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">2</span></span></span></span></span></span></span></span></span></span>-plane [O(2),O(3)] sites of <span class="aps-inline-formula"><span id="MathJax-Element-8-Frame" class="mjx-chtml MathJax_CHTML" style="font-size: 107%;"><span id="MJXc-Node-61" class="mjx-math"><span id="MJXc-Node-62" class="mjx-mrow"><span id="MJXc-Node-63" class="mjx-mrow"><span id="MJXc-Node-64" class="mjx-msub"><span class="mjx-base"><span id="MJXc-Node-65" class="mjx-mrow"><span id="MJXc-Node-66" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">YBa</span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-67" class="mjx-mrow"><span id="MJXc-Node-68" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">2</span></span></span></span></span></span></span></span></span></span><span class="aps-inline-formula"><span id="MathJax-Element-9-Frame" class="mjx-chtml MathJax_CHTML" style="font-size: 107%;"><span id="MJXc-Node-69" class="mjx-math"><span id="MJXc-Node-70" class="mjx-mrow"><span id="MJXc-Node-71" class="mjx-mrow"><span id="MJXc-Node-72" class="mjx-msub"><span class="mjx-base"><span id="MJXc-Node-73" class="mjx-mrow"><span id="MJXc-Node-74" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">Cu</span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span id="MJXc-Node-75" class="mjx-mrow"><span id="MJXc-Node-76" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">3</span></span></span></span></span></span></span></span></span></span><span class="aps-inline-formula"><span id="MathJax-Element-10-Frame" class="mjx-chtml MathJax_CHTML" style="font-size: 107%;"><span id="MJXc-Node-77" class="mjx-math"><span id="MJXc-Node-78" class="mjx-mrow"><span id="MJXc-Node-79" class="mjx-mrow"><span id="MJXc-Node-80" class="mjx-msub"><span class="mjx-base"><span id="MJXc-Node-81" class="mjx-mrow"><span id="MJXc-Node-82" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">O</span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.242em; padding-right: 0.071em;"><span id="MJXc-Node-83" class="mjx-mrow"><span id="MJXc-Node-84" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">7</span></span><span id="MJXc-Node-85" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.27em; padding-bottom: 0.404em;">−</span></span><span id="MJXc-Node-86" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.471em; padding-bottom: 0.27em; padding-right: 0.007em;">δ</span></span></span></span></span></span></span></span></span></span> can be filled with <span class="aps-inline-formula"><span id="MathJax-Element-11-Frame" class="mjx-chtml MathJax_CHTML" style="font-size: 107%;"><span id="MJXc-Node-87" class="mjx-math"><span id="MJXc-Node-88" class="mjx-mrow"><span id="MJXc-Node-89" class="mjx-mrow"><span id="MJXc-Node-90" class="mjx-mmultiscripts"><sup><span class="mjx-prestack" style="vertical-align: -0.247em;"><span class="mjx-presup" style="padding-bottom: 0.671em; padding-left: 0.05em; padding-right: 0px;"><span id="MJXc-Node-94" class="mjx-mrow" style="font-size: 70.7%;"><span id="MJXc-Node-95" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">18</span></span></span><span id="MJXc-Node-97" class="mjx-mrow" style="font-size: 70.7%;"></span></span></span></sup><span id="MJXc-Node-91" class="mjx-mrow"><span id="MJXc-Node-92" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">O</span></span></span></span></span></span></span></span></span> while the apical [O(4)] and CuO-chain sites [O(1)] contain <span class="aps-inline-formula"><span id="MathJax-Element-12-Frame" class="mjx-chtml MathJax_CHTML" style="font-size: 107%;"><span id="MJXc-Node-98" class="mjx-math"><span id="MJXc-Node-99" class="mjx-mrow"><span id="MJXc-Node-100" class="mjx-mrow"><span id="MJXc-Node-101" class="mjx-mmultiscripts"><sup><span class="mjx-prestack" style="vertical-align: -0.247em;"><span class="mjx-presup" style="padding-bottom: 0.671em; padding-left: 0.05em; padding-right: 0px;"><span id="MJXc-Node-105" class="mjx-mrow" style="font-size: 70.7%;"><span id="MJXc-Node-106" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">16</span></span></span><span id="MJXc-Node-108" class="mjx-mrow" style="font-size: 70.7%;"></span></span></span></sup><span id="MJXc-Node-102" class="mjx-mrow"><span id="MJXc-Node-103" class="mjx-mi"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.404em; padding-bottom: 0.337em;">O</span></span></span></span></span></span></span></span></span> (the opposite distribution can also be made). The site-selective isotope occupation has been confirmed by Raman spectroscopy. Our method will permit experiments to determine the contributions of the different oxygen sites to the isotope effect, in order to locate the pairing interaction within the unit cell.</p>1 aMorris, D., E.1 aMarkelz, A., G.1 aWei, J., Y. T.1 aHuitgren, C., T.1 aNickel, J., H.1 aHamilton, J., C.1 aMcCarty, K., F.  uhttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.44.955600761nas a2200265   4500008004100000020001400041245006800055210006500123260001000188300001400198490000700212100001900219700001900238700001900257700001800276700001800294700002000312700002100332700002000353700001700373700001900390700001900409700001800428856004900446       1989                        eng d  a0163-182900a8 NEW HIGH-TEMPERATURE SUPERCONDUCTORS WITH THE 1-2-4 STRUCTURE0 a8 NEW HIGHTEMPERATURE SUPERCONDUCTORS WITH THE 124 STRUCTURE  cApr 1  a7347-73500 v391 aMorris, D., E.1 aNickel, J., H.1 aWei, J., Y. T.1 aAsmar, N., G.1 aScott, J., S.1 aScheven, U., M.1 aHultgren, C., T.1 aMarkelz, A., G.1 aPost, J., E.1 aHeaney, P., J.1 aVeblen, D., R.1 aHazen, R., M.  uhttps://markelz.physics.buffalo.edu/node/28100588nas a2200193   4500008004100000020001400041245007400055210006900129260001000198300001400208490000700222100001900229700002100248700002000269700001900289700001800308700001900326856004900345       1989                        eng d  a0163-182900aOXYGEN CONCENTRATION EFFECT ON TC OF THE BI-CA-SR-CU-O SUPERCONDUCTOR0 aOXYGEN CONCENTRATION EFFECT ON TC OF THE BICASRCUO SUPERCONDUCTO  cApr 1  a6612-66140 v391 aMorris, D., E.1 aHultgren, C., T.1 aMarkelz, A., M.1 aWei, J., Y. T.1 aAsmar, N., G.1 aNickel, J., H.  uhttps://markelz.physics.buffalo.edu/node/27800501nas a2200181   4500008004100000020001400041245004400055210004400099260001000143300001400153490000700167100001900174700001900193700002000212700001900232700001900251856004900270       1988                        eng d  a0163-182900aSMALL OXYGEN ISOTOPE SHIFT IN YBA2CU3O70 aSMALL OXYGEN ISOTOPE SHIFT IN YBA2CU3O7  cApr 1  a5936-59390 v371 aMorris, D., E.1 aKuroda, R., M.1 aMarkelz, A., G.1 aNickel, J., H.1 aWei, J., Y. T.  uhttps://markelz.physics.buffalo.edu/node/27900725nas a2200217   4500008004100000020001400041245015500055210006900210260001000279300001600289490000700305100001900312700001200331700001700343700002100360700001900381700002000400700001900420700001900439856004900458       1988                        eng d  a0163-182900aSPECIFIC-HEAT MEASUREMENTS ON SUPERCONDUCTING BI-CA-SR-CU AND TL-CA-BA-CU OXIDES - ABSENCE OF A LINEAR TERM IN THE SPECIFIC-HEAT OF BI-CA-SR-CU OXIDES0 aSPECIFICHEAT MEASUREMENTS ON SUPERCONDUCTING BICASRCU AND TLCABA  cDec 1  a11942-119450 v381 aFisher, R., A.1 aKim, S.1 aLacy, S., E.1 aPhillips, N., E.1 aMorris, D., E.1 aMarkelz, A., G.1 aWei, J., Y. T.1 aGinley, D., S.  uhttps://markelz.physics.buffalo.edu/node/277