Multigap Superconductivity in the Ferromagnetic Superconductor UCoGe Revealed by Thermal Conductivity Measurements

<div>Raw data for thermal conductivity divided by temperature and electrical resistivity in inset, with (a) <svg height="15.6705pt" id="M44" style="vertical-align:-2.2393pt" version="1.1" viewbox="-0.0498162 -13.4312 23.4899 15.6705" width="23.4899pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.0135,0,0,-0.0135,9.478,-3.019)"><path d="M-21 591C-45 610 -87 648 -131 700L-155 684L-108 616H-397V566H-108L-155 498L-131 482C-87 534 -45 572 -21 591Z" id="g117-14"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="0" vert-adv-y="0"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,0,0)"><path d="M828 650H570L564 622C646 614 650 609 634 524L604 366H253L281 524C296 608 308 615 382 622L388 650H132L126 622C211 615 214 609 198 524L121 122C106 42 102 35 23 28L17 0H276L282 28C196 35 191 40 206 122L243 324H597L559 123C544 42 537 35 452 28L446 0H710L716 28C632 35 628 43 643 122L719 524C735 610 741 615 822 622L828 650Z" id="g113-73"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="840" vert-adv-y="840"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,11.423,0)"><path d="M162 -163V703H102V-163H162ZM309 -163V703H249V-163H309Z" id="g113-10"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="411" vert-adv-y="411"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,22.587,-3.699)"><path d="M-21 591C-45 610 -87 648 -131 700L-155 684L-108 616H-397V566H-108L-155 498L-131 482C-87 534 -45 572 -21 591Z" id="g117-14"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="0" vert-adv-y="0"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,16.991,0)"><path d="M452 333C452 398 425 448 375 448C329 448 235 404 140 292H138L229 683C233 701 234 712 225 712C208 712 149 686 66 677L64 652H97C135 652 140 651 129 598L38 167C23 96 29 57 44 33C60 7 98 -12 132 -12C169 -12 232 3 290 41C383 102 452 223 452 333ZM365 316C365 199 308 87 239 49C221 39 200 35 183 35C137 35 99 70 112 163C116 191 123 215 129 233C190 316 290 392 330 392C348 392 365 372 365 316Z" id="g113-99"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="469" vert-adv-y="469"></glyph.data></g></svg>-axis and (b) <svg height="14.9905pt" id="M45" style="vertical-align:-2.239201pt" version="1.1" viewbox="-0.0498162 -12.7513 22.6331 14.9905" width="22.6331pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.0135,0,0,-0.0135,9.478,-3.019)"><path d="M-21 591C-45 610 -87 648 -131 700L-155 684L-108 616H-397V566H-108L-155 498L-131 482C-87 534 -45 572 -21 591Z" id="g117-14"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="0" vert-adv-y="0"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,0,0)"><path d="M828 650H570L564 622C646 614 650 609 634 524L604 366H253L281 524C296 608 308 615 382 622L388 650H132L126 622C211 615 214 609 198 524L121 122C106 42 102 35 23 28L17 0H276L282 28C196 35 191 40 206 122L243 324H597L559 123C544 42 537 35 452 28L446 0H710L716 28C632 35 628 43 643 122L719 524C735 610 741 615 822 622L828 650Z" id="g113-73"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="840" vert-adv-y="840"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,11.423,0)"><path d="M162 -163V703H102V-163H162ZM309 -163V703H249V-163H309Z" id="g113-10"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="411" vert-adv-y="411"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,23.383,-.231)"><path d="M-21 591C-45 610 -87 648 -131 700L-155 684L-108 616H-397V566H-108L-155 498L-131 482C-87 534 -45 572 -21 591Z" id="g117-14"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="0" vert-adv-y="0"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,16.991,0)"><path d="M383 397C383 424 344 448 299 448C244 448 172 409 132 375C66 319 23 227 23 146C23 42 74 -12 146 -12C208 -12 298 30 359 103L343 124C315 95 248 48 192 48C145 48 111 85 111 163C111 228 129 294 151 330C171 363 201 401 241 401C275 401 302 384 325 356C332 347 339 344 348 348C373 360 383 381 383 397Z" id="g113-100"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="406" vert-adv-y="406"></glyph.data></g></svg>-axis. Heat current is applied along the <svg height="10.1765pt" id="M46" style="vertical-align:-0.2130203pt" version="1.1" viewbox="-0.0498162 -9.96348 5.62081 10.1765" width="5.62081pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.0135,0,0,-0.0135,6.392,-.231)"><path d="M-21 591C-45 610 -87 648 -131 700L-155 684L-108 616H-397V566H-108L-155 498L-131 482C-87 534 -45 572 -21 591Z" id="g117-14"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="0" vert-adv-y="0"></glyph.data></g><g transform="matrix(.0135,0,0,-0.0135,0,0)"><path d="M383 397C383 424 344 448 299 448C244 448 172 409 132 375C66 319 23 227 23 146C23 42 74 -12 146 -12C208 -12 298 30 359 103L343 124C315 95 248 48 192 48C145 48 111 85 111 163C111 228 129 294 151 330C171 363 201 401 241 401C275 401 302 384 325 356C332 347 339 344 348 348C373 360 383 381 383 397Z" id="g113-100"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="406" vert-adv-y="406"></glyph.data></g></svg> crystallographic axis.</div>

Physics Research International

fig1

Figure 1

Figure 1: Multigap Superconductivity in the Ferromagnetic Superconductor UCoGe Revealed by Thermal Conductivity Measurements 